Flights from Billings to Ontario (BIL to ONT)

Discover more affordable routes and cheaper dates from Billings to Ontario (BIL to ONT) within a date range.

⭐ Search by country or region to discover more affordable routes, like Netherlands → Italy or Europe → South East Asia.

Results Quantity

Cabin Bags

Checked Bags

Max Budget

US$

Max Duration

Hours

Max Layover

Hours

Departure Time

Connections

Select Airlines

Loading…

US$662

7:00am - 12:32pm
Wed Jul 16th 2025

6h 32m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 United Airlines · UA 372 Depart at 7:00am from Billings (BIL) Fly for 1h 42m Arrive at 8:42am in Denver (DEN)

Layover in Denver for 2h 33m

Wed Jul 16th 2025 United Airlines · UA 430 Depart at 11:15am from Denver (DEN) Fly for 2h 17m Arrive at 12:32pm in Ontario (ONT)
US$832

10:30am - 5:25pm
Wed Jul 16th 2025

7h 55m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 United Airlines · UA 4728 Depart at 10:30am from Billings (BIL) Fly for 1h 53m Arrive at 12:23pm in Denver (DEN)

Layover in Denver for 3h 42m

Wed Jul 16th 2025 United Airlines · UA 2057 Depart at 4:05pm from Denver (DEN) Fly for 2h 20m Arrive at 5:25pm in Ontario (ONT)
US$849

4:15pm - 8:54pm
Sat Jul 19th 2025

5h 39m
Billings (BIL) → Ontario (ONT)

1 Stop

Sat Jul 19th 2025 United Airlines · UA 5240 Depart at 4:15pm from Billings (BIL) Fly for 1h 53m Arrive at 6:08pm in Denver (DEN)

Layover in Denver for 1h 27m

Sat Jul 19th 2025 United Airlines · UA 1574 Depart at 7:35pm from Denver (DEN) Fly for 2h 19m Arrive at 8:54pm in Ontario (ONT)
US$849

2:35pm - 8:54pm
Sat Jul 19th 2025

7h 19m
Billings (BIL) → Ontario (ONT)

1 Stop

Sat Jul 19th 2025 United Airlines · UA 478 Depart at 2:35pm from Billings (BIL) Fly for 1h 42m Arrive at 4:17pm in Denver (DEN)

Layover in Denver for 3h 18m

Sat Jul 19th 2025 United Airlines · UA 1574 Depart at 7:35pm from Denver (DEN) Fly for 2h 19m Arrive at 8:54pm in Ontario (ONT)
US$870

7:17pm - 12:15am
Thu Jul 17th 2025

5h 58m
Billings (BIL) → Ontario (ONT)

1 Stop

Thu Jul 17th 2025 Alaska Airlines · AS 2208 Depart at 7:17pm from Billings (BIL) Fly for 2h 13m Arrive at 8:30pm in Seattle (SEA)

Layover in Seattle for 1h 0m

Thu Jul 17th 2025 Alaska Airlines · AS 1040 Depart at 9:30pm from Seattle (SEA) Fly for 2h 45m Arrive at 12:15am in Ontario (ONT)
US$993

2:03pm - 12:15am
Wed Jul 16th 2025

11h 12m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Hawaiian Airlines · HA 4776 Depart at 2:03pm from Billings (BIL) Fly for 2h 10m Arrive at 3:13pm in Seattle (SEA)

Layover in Seattle for 6h 17m

Wed Jul 16th 2025 Hawaiian Airlines · HA 6811 Depart at 9:30pm from Seattle (SEA) Fly for 2h 45m Arrive at 12:15am in Ontario (ONT)
US$1028

2:03pm - 12:15am
Wed Jul 16th 2025

11h 12m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Alaska Airlines · AS 2084 Depart at 2:03pm from Billings (BIL) Fly for 2h 10m Arrive at 3:13pm in Seattle (SEA)

Layover in Seattle for 6h 17m

Wed Jul 16th 2025 Alaska Airlines · AS 1040 Depart at 9:30pm from Seattle (SEA) Fly for 2h 45m Arrive at 12:15am in Ontario (ONT)
US$1069

7:17pm - 12:15am
Wed Jul 16th 2025

5h 58m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Hawaiian Airlines · HA 4777 Depart at 7:17pm from Billings (BIL) Fly for 2h 13m Arrive at 8:30pm in Seattle (SEA)

Layover in Seattle for 1h 0m

Wed Jul 16th 2025 Hawaiian Airlines · HA 6811 Depart at 9:30pm from Seattle (SEA) Fly for 2h 45m Arrive at 12:15am in Ontario (ONT)
US$1069

6:00am - 11:05am
Wed Jul 16th 2025

6h 5m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Hawaiian Airlines · HA 4778 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 1h 18m

Wed Jul 16th 2025 Hawaiian Airlines · HA 6814 Depart at 8:27am from Seattle (SEA) Fly for 2h 38m Arrive at 11:05am in Ontario (ONT)
US$1069

6:00am - 1:26pm
Wed Jul 16th 2025

8h 26m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Hawaiian Airlines · HA 4778 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 3h 38m

Wed Jul 16th 2025 Hawaiian Airlines · HA 6803 Depart at 10:47am from Seattle (SEA) Fly for 2h 39m Arrive at 1:26pm in Ontario (ONT)
US$1103

7:17pm - 12:15am
Wed Jul 16th 2025

5h 58m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Alaska Airlines · AS 2208 Depart at 7:17pm from Billings (BIL) Fly for 2h 13m Arrive at 8:30pm in Seattle (SEA)

Layover in Seattle for 1h 0m

Wed Jul 16th 2025 Alaska Airlines · AS 1040 Depart at 9:30pm from Seattle (SEA) Fly for 2h 45m Arrive at 12:15am in Ontario (ONT)
US$1103

6:00am - 11:05am
Wed Jul 16th 2025

6h 5m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Alaska Airlines · AS 2555 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 1h 18m

Wed Jul 16th 2025 Alaska Airlines · AS 1254 Depart at 8:27am from Seattle (SEA) Fly for 2h 38m Arrive at 11:05am in Ontario (ONT)
US$1103

6:00am - 1:26pm
Wed Jul 16th 2025

8h 26m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Alaska Airlines · AS 2555 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 3h 38m

Wed Jul 16th 2025 Alaska Airlines · AS 1278 Depart at 10:47am from Seattle (SEA) Fly for 2h 39m Arrive at 1:26pm in Ontario (ONT)
US$1121

6:00am - 2:46pm
Wed Jul 16th 2025

9h 46m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Hawaiian Airlines · HA 4778 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 4h 51m

Wed Jul 16th 2025 Hawaiian Airlines · HA 6813 Depart at 12:00pm from Seattle (SEA) Fly for 2h 46m Arrive at 2:46pm in Ontario (ONT)
US$1130

7:00am - 12:32pm
Sat Jul 19th 2025

6h 32m
Billings (BIL) → Ontario (ONT)

1 Stop

Sat Jul 19th 2025 United Airlines · UA 372 Depart at 7:00am from Billings (BIL) Fly for 1h 42m Arrive at 8:42am in Denver (DEN)

Layover in Denver for 2h 33m

Sat Jul 19th 2025 United Airlines · UA 430 Depart at 11:15am from Denver (DEN) Fly for 2h 17m Arrive at 12:32pm in Ontario (ONT)
US$1130

2:35pm - 8:54pm
Wed Jul 16th 2025

7h 19m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 United Airlines · UA 478 Depart at 2:35pm from Billings (BIL) Fly for 1h 42m Arrive at 4:17pm in Denver (DEN)

Layover in Denver for 3h 18m

Wed Jul 16th 2025 United Airlines · UA 1574 Depart at 7:35pm from Denver (DEN) Fly for 2h 19m Arrive at 8:54pm in Ontario (ONT)
US$1130

10:30am - 5:25pm
Sat Jul 19th 2025

7h 55m
Billings (BIL) → Ontario (ONT)

1 Stop

Sat Jul 19th 2025 United Airlines · UA 4728 Depart at 10:30am from Billings (BIL) Fly for 1h 53m Arrive at 12:23pm in Denver (DEN)

Layover in Denver for 3h 42m

Sat Jul 19th 2025 United Airlines · UA 2057 Depart at 4:05pm from Denver (DEN) Fly for 2h 20m Arrive at 5:25pm in Ontario (ONT)
US$1152

5:00am - 12:14pm
Wed Jul 16th 2025

8h 14m
Billings (BIL) → Ontario (ONT)

2 Stops

Wed Jul 16th 2025 United Airlines · UA 5829 Depart at 5:00am from Billings (BIL) Fly for 1h 50m Arrive at 6:50am in Denver (DEN)

Layover in Denver for 1h 12m

Wed Jul 16th 2025 United Airlines · UA 1493 Depart at 8:02am from Denver (DEN) Fly for 2h 43m Arrive at 9:45am in San Francisco (SFO)

Layover in San Francisco for 1h 0m

Wed Jul 16th 2025 United Airlines · UA 1697 Depart at 10:45am from San Francisco (SFO) Fly for 1h 29m Arrive at 12:14pm in Ontario (ONT)
US$1155

6:00am - 2:46pm
Wed Jul 16th 2025

9h 46m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Alaska Airlines · AS 2555 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 4h 51m

Wed Jul 16th 2025 Alaska Airlines · AS 1118 Depart at 12:00pm from Seattle (SEA) Fly for 2h 46m Arrive at 2:46pm in Ontario (ONT)
US$1228

3:45pm - 11:59pm
Wed Jul 16th 2025

9h 14m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Hawaiian Airlines · HA 4775 Depart at 3:45pm from Billings (BIL) Fly for 2h 5m Arrive at 4:50pm in Portland (PDX)

Layover in Portland for 4h 51m

Wed Jul 16th 2025 Hawaiian Airlines · HA 6372 Depart at 9:41pm from Portland (PDX) Fly for 2h 18m Arrive at 11:59pm in Ontario (ONT)
US$1261

3:45pm - 11:59pm
Wed Jul 16th 2025

9h 14m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Alaska Airlines · AS 2197 Depart at 3:45pm from Billings (BIL) Fly for 2h 5m Arrive at 4:50pm in Portland (PDX)

Layover in Portland for 4h 51m

Wed Jul 16th 2025 Alaska Airlines · AS 2178 Depart at 9:41pm from Portland (PDX) Fly for 2h 18m Arrive at 11:59pm in Ontario (ONT)
US$1316

7:17pm - 12:15am
Sat Jul 19th 2025

5h 58m
Billings (BIL) → Ontario (ONT)

1 Stop

Sat Jul 19th 2025 Hawaiian Airlines · HA 4777 Depart at 7:17pm from Billings (BIL) Fly for 2h 13m Arrive at 8:30pm in Seattle (SEA)

Layover in Seattle for 1h 0m

Sat Jul 19th 2025 Hawaiian Airlines · HA 6811 Depart at 9:30pm from Seattle (SEA) Fly for 2h 45m Arrive at 12:15am in Ontario (ONT)
US$1349

7:17pm - 12:15am
Sat Jul 19th 2025

5h 58m
Billings (BIL) → Ontario (ONT)

1 Stop

Sat Jul 19th 2025 Alaska Airlines · AS 2208 Depart at 7:17pm from Billings (BIL) Fly for 2h 13m Arrive at 8:30pm in Seattle (SEA)

Layover in Seattle for 1h 0m

Sat Jul 19th 2025 Alaska Airlines · AS 1040 Depart at 9:30pm from Seattle (SEA) Fly for 2h 45m Arrive at 12:15am in Ontario (ONT)
US$1349

6:00am - 11:05am
Fri Jul 18th 2025

6h 5m
Billings (BIL) → Ontario (ONT)

1 Stop

Fri Jul 18th 2025 Alaska Airlines · AS 2555 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 1h 18m

Fri Jul 18th 2025 Alaska Airlines · AS 1254 Depart at 8:27am from Seattle (SEA) Fly for 2h 38m Arrive at 11:05am in Ontario (ONT)
US$1349

6:00am - 11:05am
Thu Jul 17th 2025

6h 5m
Billings (BIL) → Ontario (ONT)

1 Stop

Thu Jul 17th 2025 Alaska Airlines · AS 2555 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 1h 18m

Thu Jul 17th 2025 Alaska Airlines · AS 1254 Depart at 8:27am from Seattle (SEA) Fly for 2h 38m Arrive at 11:05am in Ontario (ONT)
US$1349

6:00am - 1:26pm
Thu Jul 17th 2025

8h 26m
Billings (BIL) → Ontario (ONT)

1 Stop

Thu Jul 17th 2025 Alaska Airlines · AS 2555 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 3h 38m

Thu Jul 17th 2025 Alaska Airlines · AS 1278 Depart at 10:47am from Seattle (SEA) Fly for 2h 39m Arrive at 1:26pm in Ontario (ONT)
US$1349

6:00am - 1:26pm
Fri Jul 18th 2025

8h 26m
Billings (BIL) → Ontario (ONT)

1 Stop

Fri Jul 18th 2025 Alaska Airlines · AS 2555 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 3h 38m

Fri Jul 18th 2025 Alaska Airlines · AS 1278 Depart at 10:47am from Seattle (SEA) Fly for 2h 39m Arrive at 1:26pm in Ontario (ONT)
US$1356

4:15pm - 8:54pm
Fri Jul 18th 2025

5h 39m
Billings (BIL) → Ontario (ONT)

1 Stop

Fri Jul 18th 2025 United Airlines · UA 5240 Depart at 4:15pm from Billings (BIL) Fly for 1h 53m Arrive at 6:08pm in Denver (DEN)

Layover in Denver for 1h 27m

Fri Jul 18th 2025 United Airlines · UA 1574 Depart at 7:35pm from Denver (DEN) Fly for 2h 19m Arrive at 8:54pm in Ontario (ONT)
US$1356

7:00am - 12:32pm
Fri Jul 18th 2025

6h 32m
Billings (BIL) → Ontario (ONT)

1 Stop

Fri Jul 18th 2025 United Airlines · UA 372 Depart at 7:00am from Billings (BIL) Fly for 1h 42m Arrive at 8:42am in Denver (DEN)

Layover in Denver for 2h 33m

Fri Jul 18th 2025 United Airlines · UA 430 Depart at 11:15am from Denver (DEN) Fly for 2h 17m Arrive at 12:32pm in Ontario (ONT)
US$1356

4:15pm - 8:54pm
Wed Jul 16th 2025

5h 39m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 United Airlines · UA 5240 Depart at 4:15pm from Billings (BIL) Fly for 1h 53m Arrive at 6:08pm in Denver (DEN)

Layover in Denver for 1h 27m

Wed Jul 16th 2025 United Airlines · UA 1574 Depart at 7:35pm from Denver (DEN) Fly for 2h 19m Arrive at 8:54pm in Ontario (ONT)
US$1436

7:17pm - 12:15am
Wed Jul 16th 2025

5h 58m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Alaska Airlines · AS 2208 Depart at 7:17pm from Billings (BIL) Fly for 2h 13m Arrive at 8:30pm in Seattle (SEA)

Layover in Seattle for 1h 0m

Wed Jul 16th 2025 Hawaiian Airlines · HA 6811 Depart at 9:30pm from Seattle (SEA) Fly for 2h 45m Arrive at 12:15am in Ontario (ONT)
US$1436

7:17pm - 12:15am
Wed Jul 16th 2025

5h 58m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Hawaiian Airlines · HA 4777 Depart at 7:17pm from Billings (BIL) Fly for 2h 13m Arrive at 8:30pm in Seattle (SEA)

Layover in Seattle for 1h 0m

Wed Jul 16th 2025 Alaska Airlines · AS 1040 Depart at 9:30pm from Seattle (SEA) Fly for 2h 45m Arrive at 12:15am in Ontario (ONT)
US$1436

6:00am - 11:05am
Wed Jul 16th 2025

6h 5m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Alaska Airlines · AS 2555 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 1h 18m

Wed Jul 16th 2025 Hawaiian Airlines · HA 6814 Depart at 8:27am from Seattle (SEA) Fly for 2h 38m Arrive at 11:05am in Ontario (ONT)
US$1436

6:00am - 11:05am
Wed Jul 16th 2025

6h 5m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Hawaiian Airlines · HA 4778 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 1h 18m

Wed Jul 16th 2025 Alaska Airlines · AS 1254 Depart at 8:27am from Seattle (SEA) Fly for 2h 38m Arrive at 11:05am in Ontario (ONT)
US$1436

6:00am - 1:26pm
Wed Jul 16th 2025

8h 26m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Hawaiian Airlines · HA 4778 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 3h 38m

Wed Jul 16th 2025 Alaska Airlines · AS 1278 Depart at 10:47am from Seattle (SEA) Fly for 2h 39m Arrive at 1:26pm in Ontario (ONT)
US$1436

6:00am - 1:26pm
Wed Jul 16th 2025

8h 26m
Billings (BIL) → Ontario (ONT)

1 Stop

Wed Jul 16th 2025 Alaska Airlines · AS 2555 Depart at 6:00am from Billings (BIL) Fly for 2h 9m Arrive at 7:09am in Seattle (SEA)

Layover in Seattle for 3h 38m

Wed Jul 16th 2025 Hawaiian Airlines · HA 6803 Depart at 10:47am from Seattle (SEA) Fly for 2h 39m Arrive at 1:26pm in Ontario (ONT)
US$1556

10:30am - 5:25pm
Fri Jul 18th 2025

7h 55m
Billings (BIL) → Ontario (ONT)

1 Stop

Fri Jul 18th 2025 United Airlines · UA 4728 Depart at 10:30am from Billings (BIL) Fly for 1h 53m Arrive at 12:23pm in Denver (DEN)

Layover in Denver for 3h 42m

Fri Jul 18th 2025 United Airlines · UA 2057 Depart at 4:05pm from Denver (DEN) Fly for 2h 20m Arrive at 5:25pm in Ontario (ONT)
US$1597

7:17pm - 12:15am
Fri Jul 18th 2025

5h 58m
Billings (BIL) → Ontario (ONT)

1 Stop

Fri Jul 18th 2025 Alaska Airlines · AS 2208 Depart at 7:17pm from Billings (BIL) Fly for 2h 13m Arrive at 8:30pm in Seattle (SEA)

Layover in Seattle for 1h 0m

Fri Jul 18th 2025 Alaska Airlines · AS 1040 Depart at 9:30pm from Seattle (SEA) Fly for 2h 45m Arrive at 12:15am in Ontario (ONT)
US$1735

7:17pm - 12:15am
Sat Jul 19th 2025

5h 58m
Billings (BIL) → Ontario (ONT)

1 Stop

Sat Jul 19th 2025 Alaska Airlines · AS 2208 Depart at 7:17pm from Billings (BIL) Fly for 2h 13m Arrive at 8:30pm in Seattle (SEA)

Layover in Seattle for 1h 0m

Sat Jul 19th 2025 Hawaiian Airlines · HA 6811 Depart at 9:30pm from Seattle (SEA) Fly for 2h 45m Arrive at 12:15am in Ontario (ONT)
US$1735

7:17pm - 12:15am
Sat Jul 19th 2025

5h 58m
Billings (BIL) → Ontario (ONT)

1 Stop

Sat Jul 19th 2025 Hawaiian Airlines · HA 4777 Depart at 7:17pm from Billings (BIL) Fly for 2h 13m Arrive at 8:30pm in Seattle (SEA)

Layover in Seattle for 1h 0m

Sat Jul 19th 2025 Alaska Airlines · AS 1040 Depart at 9:30pm from Seattle (SEA) Fly for 2h 45m Arrive at 12:15am in Ontario (ONT)

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 Billings to Ontario (BIL to ONT)

Sarah Belizaire

John Ford

Roaming Sonaa

Andy Travels

Travel With Bender

Wesley Mergard

Explore Flight Options

FlightList Blog

Flightlist Interviews 7 Travel Experts On Why They Book One Way Flights

Why I Built FlightList & Solved My Own Problem

About FlightList