Flights from St. Louis to Denver (STL to DEN)

Discover more affordable routes and cheaper dates for flights from St. Louis to Denver (STL to DEN) within a date range.

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US$118

7:55pm - 9:20pm
Sat Sep 6th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 17th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Sep 6th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 10 nights

Wed Sep 17th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Sat Sep 6th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 9th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Sep 6th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 2 nights

Tue Sep 9th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Mon Sep 8th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 17th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Sep 8th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 8 nights

Wed Sep 17th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Mon Sep 8th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Mon Sep 15th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Sep 8th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 6 nights

Mon Sep 15th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Sat Sep 6th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Mon Sep 8th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Sep 6th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 1 night

Mon Sep 8th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Mon Sep 8th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Sep 8th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 2 nights

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Tue Sep 9th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 13th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Tue Sep 9th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 3 nights

Sat Sep 13th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Mon Sep 8th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 13th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Sep 8th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 4 nights

Sat Sep 13th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Sat Sep 6th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Sep 6th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 4 nights

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Tue Sep 9th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 10th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Tue Sep 9th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 0 nights

Wed Sep 10th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Sat Sep 13th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 20th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Sep 13th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 6 nights

Sat Sep 20th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Thu Sep 4th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 16th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Sep 4th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 11 nights

Tue Sep 16th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Sat Sep 6th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 20th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Sep 6th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 13 nights

Sat Sep 20th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Thu Sep 4th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Mon Sep 15th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Sep 4th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 10 nights

Mon Sep 15th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Sat Sep 13th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 16th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Sep 13th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 2 nights

Tue Sep 16th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Mon Sep 8th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 20th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Sep 8th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 11 nights

Sat Sep 20th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Mon Sep 8th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 10th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Sep 8th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 1 night

Wed Sep 10th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Mon Sep 8th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 16th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Sep 8th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 7 nights

Tue Sep 16th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Mon Sep 15th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 17th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Sep 15th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 1 night

Wed Sep 17th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Wed Sep 10th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 17th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Sep 10th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 6 nights

Wed Sep 17th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Wed Sep 10th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 16th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Sep 10th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 5 nights

Tue Sep 16th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Mon Sep 15th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 16th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Sep 15th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 0 nights

Tue Sep 16th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Tue Sep 9th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Mon Sep 15th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Tue Sep 9th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 5 nights

Mon Sep 15th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Tue Sep 9th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Tue Sep 9th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 1 night

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Tue Sep 9th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 20th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Tue Sep 9th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 10 nights

Sat Sep 20th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Sat Sep 6th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 13th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Sep 6th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 6 nights

Sat Sep 13th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Thu Sep 4th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Sep 4th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 6 nights

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Wed Sep 10th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Sep 10th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 0 nights

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Wed Sep 10th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 13th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Sep 10th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 2 nights

Sat Sep 13th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Wed Sep 10th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 20th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Sep 10th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 9 nights

Sat Sep 20th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Thu Sep 4th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 20th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Sep 4th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 15 nights

Sat Sep 20th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Mon Sep 15th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 20th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Sep 15th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 4 nights

Sat Sep 20th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Thu Sep 4th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 10th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Sep 4th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 5 nights

Wed Sep 10th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Thu Sep 4th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 17th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Sep 4th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 12 nights

Wed Sep 17th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Thu Sep 4th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 9th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Sep 4th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 4 nights

Tue Sep 9th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:55pm - 9:20pm
Wed Sep 10th 2025

2h 25m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Mon Sep 15th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Sep 10th 2025 Frontier Airlines · F9 4567 Depart at 7:55pm from St. Louis (STL) Fly for 2h 25m Arrive at 9:20pm in Denver (DEN)

Stay in Denver for 4 nights

Mon Sep 15th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Sat Aug 23rd 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 10th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 23rd 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 17 nights

Wed Sep 10th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Wed Aug 13th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 6th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 23 nights

Sat Sep 6th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Wed Aug 20th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 6th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 20th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 16 nights

Sat Sep 6th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Wed Aug 13th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 28 nights

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Wed Aug 13th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 4th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 21 nights

Thu Sep 4th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Wed Aug 13th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 13th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 30 nights

Sat Sep 13th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Sat Aug 23rd 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 13th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 23rd 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 20 nights

Sat Sep 13th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Wed Aug 13th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 20th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 37 nights

Sat Sep 20th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Wed Aug 13th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 17th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 34 nights

Wed Sep 17th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Wed Aug 13th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 10th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 27 nights

Wed Sep 10th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Wed Aug 13th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 16th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 33 nights

Tue Sep 16th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Wed Aug 13th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 9th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 26 nights

Tue Sep 9th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Wed Aug 13th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Mon Sep 15th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 32 nights

Mon Sep 15th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Wed Aug 20th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 20th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 21 nights

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Wed Aug 20th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 9th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 20th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 19 nights

Tue Sep 9th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Wed Aug 20th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 4th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 20th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 14 nights

Thu Sep 4th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Wed Aug 20th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Mon Sep 15th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 20th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 25 nights

Mon Sep 15th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Wed Aug 20th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 17th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 20th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 27 nights

Wed Sep 17th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Wed Aug 13th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Mon Sep 8th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 25 nights

Mon Sep 8th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Sat Aug 23rd 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 16th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 23rd 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 23 nights

Tue Sep 16th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Wed Aug 27th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 16th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 27th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 19 nights

Tue Sep 16th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Wed Aug 27th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 17th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 27th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 20 nights

Wed Sep 17th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Wed Aug 27th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 10th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 27th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 13 nights

Wed Sep 10th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Wed Aug 27th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 6th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 27th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 9 nights

Sat Sep 6th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Tue Aug 26th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 6th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Tue Aug 26th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 10 nights

Sat Sep 6th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Mon Aug 18th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 6th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 18th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 18 nights

Sat Sep 6th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Sat Aug 16th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 6th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 16th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 20 nights

Sat Sep 6th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Thu Aug 21st 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Mon Sep 8th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Aug 21st 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 17 nights

Mon Sep 8th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Thu Aug 21st 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 16th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Aug 21st 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 25 nights

Tue Sep 16th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Thu Aug 21st 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 9th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Aug 21st 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 18 nights

Tue Sep 9th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Thu Aug 21st 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 13th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Aug 21st 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 22 nights

Sat Sep 13th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Thu Aug 21st 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 20th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Aug 21st 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 29 nights

Sat Sep 20th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Thu Aug 21st 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Mon Sep 15th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Aug 21st 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 24 nights

Mon Sep 15th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Thu Aug 21st 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 17th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Aug 21st 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 26 nights

Wed Sep 17th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Thu Aug 21st 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 4th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Aug 21st 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 13 nights

Thu Sep 4th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Thu Aug 21st 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Aug 21st 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 20 nights

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Thu Aug 21st 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Sat Sep 6th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Aug 21st 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 15 nights

Sat Sep 6th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Thu Aug 21st 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 10th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Thu Aug 21st 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 19 nights

Wed Sep 10th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Sat Aug 16th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 9th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 16th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 23 nights

Tue Sep 9th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Tue Aug 26th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Tue Aug 26th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 15 nights

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Sat Aug 23rd 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 23rd 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 18 nights

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Wed Aug 27th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 27th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 14 nights

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Sat Aug 16th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 16th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 25 nights

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Sat Aug 30th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 17th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 30th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 17 nights

Wed Sep 17th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Sat Aug 30th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 10th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 30th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 10 nights

Wed Sep 10th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:54pm - 9:23pm
Sat Aug 30th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 16th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 30th 2025 Frontier Airlines · F9 4567 Depart at 7:54pm from St. Louis (STL) Fly for 2h 29m Arrive at 9:23pm in Denver (DEN)

Stay in Denver for 16 nights

Tue Sep 16th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Mon Aug 18th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 4th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 18th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 16 nights

Thu Sep 4th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Mon Aug 18th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 16th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 18th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 28 nights

Tue Sep 16th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Mon Aug 18th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Thu Sep 11th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 18th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 23 nights

Thu Sep 11th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Mon Aug 18th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 10th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 18th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 22 nights

Wed Sep 10th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Mon Aug 18th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Mon Sep 15th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 18th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 27 nights

Mon Sep 15th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Mon Aug 18th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Mon Sep 8th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 18th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 20 nights

Mon Sep 8th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Mon Aug 18th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Wed Sep 17th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 18th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 29 nights

Wed Sep 17th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$118

7:29pm - 8:58pm
Mon Aug 18th 2025

2h 29m
St. Louis (STL) → Denver (DEN)

Direct

6:00am - 9:06am
Tue Sep 9th 2025

2h 6m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 18th 2025 Frontier Airlines · F9 4567 Depart at 7:29pm from St. Louis (STL) Fly for 2h 29m Arrive at 8:58pm in Denver (DEN)

Stay in Denver for 21 nights

Tue Sep 9th 2025 Frontier Airlines · F9 3302 Depart at 6:00am from Denver (DEN) Fly for 2h 6m Arrive at 9:06am in St. Louis (STL)
US$284

1:42pm - 2:59pm
Sat Aug 16th 2025

2h 17m
St. Louis (STL) → Denver (DEN)

Direct

9:40am - 12:43pm
Tue Aug 26th 2025

2h 3m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 16th 2025 United Airlines · UA 2625 Depart at 1:42pm from St. Louis (STL) Fly for 2h 17m Arrive at 2:59pm in Denver (DEN)

Stay in Denver for 9 nights

Tue Aug 26th 2025 United Airlines · UA 652 Depart at 9:40am from Denver (DEN) Fly for 2h 3m Arrive at 12:43pm in St. Louis (STL)
US$285

1:42pm - 2:59pm
Sat Aug 16th 2025

2h 17m
St. Louis (STL) → Denver (DEN)

Direct

9:40am - 12:43pm
Sat Aug 23rd 2025

2h 3m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 16th 2025 United Airlines · UA 2625 Depart at 1:42pm from St. Louis (STL) Fly for 2h 17m Arrive at 2:59pm in Denver (DEN)

Stay in Denver for 6 nights

Sat Aug 23rd 2025 United Airlines · UA 652 Depart at 9:40am from Denver (DEN) Fly for 2h 3m Arrive at 12:43pm in St. Louis (STL)
US$285

1:42pm - 2:59pm
Wed Aug 13th 2025

2h 17m
St. Louis (STL) → Denver (DEN)

Direct

9:40am - 12:43pm
Wed Aug 27th 2025

2h 3m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 United Airlines · UA 2625 Depart at 1:42pm from St. Louis (STL) Fly for 2h 17m Arrive at 2:59pm in Denver (DEN)

Stay in Denver for 13 nights

Wed Aug 27th 2025 United Airlines · UA 652 Depart at 9:40am from Denver (DEN) Fly for 2h 3m Arrive at 12:43pm in St. Louis (STL)
US$295

1:42pm - 2:59pm
Mon Aug 18th 2025

2h 17m
St. Louis (STL) → Denver (DEN)

Direct

9:40am - 12:43pm
Sat Aug 23rd 2025

2h 3m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 18th 2025 United Airlines · UA 2625 Depart at 1:42pm from St. Louis (STL) Fly for 2h 17m Arrive at 2:59pm in Denver (DEN)

Stay in Denver for 4 nights

Sat Aug 23rd 2025 United Airlines · UA 652 Depart at 9:40am from Denver (DEN) Fly for 2h 3m Arrive at 12:43pm in St. Louis (STL)
US$338

1:42pm - 2:59pm
Mon Aug 18th 2025

2h 17m
St. Louis (STL) → Denver (DEN)

Direct

9:40am - 12:43pm
Wed Aug 27th 2025

2h 3m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 18th 2025 United Airlines · UA 2625 Depart at 1:42pm from St. Louis (STL) Fly for 2h 17m Arrive at 2:59pm in Denver (DEN)

Stay in Denver for 8 nights

Wed Aug 27th 2025 United Airlines · UA 652 Depart at 9:40am from Denver (DEN) Fly for 2h 3m Arrive at 12:43pm in St. Louis (STL)
US$350

1:42pm - 2:59pm
Wed Aug 13th 2025

2h 17m
St. Louis (STL) → Denver (DEN)

Direct

9:40am - 12:43pm
Sat Aug 30th 2025

2h 3m
Denver (DEN) → St. Louis (STL)

Direct

Wed Aug 13th 2025 United Airlines · UA 2625 Depart at 1:42pm from St. Louis (STL) Fly for 2h 17m Arrive at 2:59pm in Denver (DEN)

Stay in Denver for 16 nights

Sat Aug 30th 2025 United Airlines · UA 652 Depart at 9:40am from Denver (DEN) Fly for 2h 3m Arrive at 12:43pm in St. Louis (STL)
US$372

1:42pm - 2:59pm
Mon Aug 18th 2025

2h 17m
St. Louis (STL) → Denver (DEN)

Direct

9:40am - 12:43pm
Fri Aug 22nd 2025

2h 3m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 18th 2025 United Airlines · UA 2625 Depart at 1:42pm from St. Louis (STL) Fly for 2h 17m Arrive at 2:59pm in Denver (DEN)

Stay in Denver for 3 nights

Fri Aug 22nd 2025 United Airlines · UA 652 Depart at 9:40am from Denver (DEN) Fly for 2h 3m Arrive at 12:43pm in St. Louis (STL)
US$375

1:42pm - 2:59pm
Sat Aug 9th 2025

2h 17m
St. Louis (STL) → Denver (DEN)

Direct

9:40am - 12:43pm
Sat Aug 23rd 2025

2h 3m
Denver (DEN) → St. Louis (STL)

Direct

Sat Aug 9th 2025 United Airlines · UA 2625 Depart at 1:42pm from St. Louis (STL) Fly for 2h 17m Arrive at 2:59pm in Denver (DEN)

Stay in Denver for 13 nights

Sat Aug 23rd 2025 United Airlines · UA 652 Depart at 9:40am from Denver (DEN) Fly for 2h 3m Arrive at 12:43pm in St. Louis (STL)
US$381

1:42pm - 2:59pm
Mon Aug 11th 2025

2h 17m
St. Louis (STL) → Denver (DEN)

Direct

9:40am - 12:43pm
Sat Aug 30th 2025

2h 3m
Denver (DEN) → St. Louis (STL)

Direct

Mon Aug 11th 2025 United Airlines · UA 2625 Depart at 1:42pm from St. Louis (STL) Fly for 2h 17m Arrive at 2:59pm in Denver (DEN)

Stay in Denver for 18 nights

Sat Aug 30th 2025 United Airlines · UA 652 Depart at 9:40am from Denver (DEN) Fly for 2h 3m Arrive at 12:43pm in St. Louis (STL)
US$397

1:42pm - 2:59pm
Sun Aug 17th 2025

2h 17m
St. Louis (STL) → Denver (DEN)

Direct

9:40am - 12:43pm
Sun Aug 31st 2025

2h 3m
Denver (DEN) → St. Louis (STL)

Direct

Sun Aug 17th 2025 United Airlines · UA 2625 Depart at 1:42pm from St. Louis (STL) Fly for 2h 17m Arrive at 2:59pm in Denver (DEN)

Stay in Denver for 13 nights

Sun Aug 31st 2025 United Airlines · UA 652 Depart at 9:40am from Denver (DEN) Fly for 2h 3m Arrive at 12:43pm in St. Louis (STL)

Sarah Belizaire

@sarahbb1

Have flexible travel plans or looking for alternative routes given the chaos? Check out all the connection possibilities via a super helpful site created by @ismaelyws flightlist.io thanks to @andy_travels for the recommendation #travel #flights

John Ford

@eyupitsjohn

There seem to be lots of sites launching at the moment that promise to find you cheap flights but not many have the professional finish of Flightlist by @ismaelyws #travel #flights

Roaming Sonaa

@roamingsonaa

For people wanting to maximize their trips, Flightlist is my newest travel hack for uncovering the coolest routes at irresistible prices. No stress, no annoying ads — just seamless flight booking with amazing functionality.

Andy Travels

@andy_travels

@ismaelyws Just tried out Flightlist for the first time. Really nice idea, well made, and just what I need at the moment 👍

Travel With Bender

@travelwitbender

Did you spot my recent article about how to score cheap one way flights? ✈️ FlightList is my new secret tool for discovering cheap routes, within a departure date range. Plus you can also search by country/region for departures & destinations. Powerful! 💪

Wesley Mergard

@travel.with.wes

One useful tool I've found for evaluating different departure and return dates is called FlightList.io. You can quickly scan different travel date ranges, carriers and one way flight options to easily determine the cheapest flight combinations for your trip.

Flights from St. Louis to Denver (STL to DEN)

Sarah Belizaire

John Ford

Roaming Sonaa

Andy Travels

Travel With Bender

Wesley Mergard

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