Cheap Flights from St. Louis to Chiang Mai (STL to CNX)

Discover more affordable routes and cheaper dates from St. Louis to Chiang Mai (STL to CNX) within a date range.

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US$739

11:23am - 9:55pm
Tue Jul 22nd 2025

22h 32m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Tue Jul 22nd 2025 Korean Air · KE 3830 Depart at 11:23am from St. Louis (STL) Fly for 1h 32m Arrive at 12:55pm in Minneapolis (MSP)

Layover in Minneapolis for 0h 45m

Tue Jul 22nd 2025 Korean Air · KE 5034 Depart at 1:40pm from Minneapolis (MSP) Fly for 13h 40m Arrive at 5:20pm in Seoul (ICN)

Layover in Seoul for 1h 5m

Wed Jul 23rd 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$745

7:32pm - 7:25am
Sun Jul 20th 2025

47h 53m
St. Louis (STL) → Chiang Mai (CNX)

3 Stops

Sun Jul 20th 2025 Hawaiian Airlines · HA 7125 Depart at 7:32pm from St. Louis (STL) Fly for 4h 28m Arrive at 10:00pm in Seattle (SEA)

Layover in Seattle for 15h 20m

Mon Jul 21st 2025 Korean Air · KE 42 Depart at 1:20pm from Seattle (SEA) Fly for 11h 20m Arrive at 4:40pm in Seoul (ICN)

Layover in Seoul for 1h 25m

Tue Jul 22nd 2025 Korean Air · KE 651 Depart at 6:05pm from Seoul (ICN) Fly for 5h 40m Arrive at 9:45pm in Bangkok (BKK)

Layover in Bangkok for 8h 15m

Wed Jul 23rd 2025 Thai Vietjet · VZ 100 Depart at 6:00am from Bangkok (BKK) Fly for 1h 25m Arrive at 7:25am in Chiang Mai (CNX)

Book Flight
US$784

6:14am - 7:50am
Sat Jul 19th 2025

37h 36m
St. Louis (STL) → Chiang Mai (CNX)

3 Stops

Sat Jul 19th 2025 Alaska Airlines · AS 4703 Depart at 6:14am from St. Louis (STL) Fly for 4h 23m Arrive at 8:37am in Los Angeles (LAX)

Layover in Los Angeles for 5h 43m

Sat Jul 19th 2025 Singapore Airlines · SQ 11 Depart at 2:20pm from Los Angeles (LAX) Fly for 11h 30m Arrive at 5:50pm in Tokyo (NRT)

Layover in Tokyo for 3h 25m

Sun Jul 20th 2025 Thai AirAsia X · XJ 607 Depart at 9:15pm from Tokyo (NRT) Fly for 7h 25m Arrive at 2:40am in Bangkok (DMK)

Layover in Bangkok for 4h 0m

Mon Jul 21st 2025 Thai AirAsia · FD 3437 Depart at 6:40am from Bangkok (DMK) Fly for 1h 10m Arrive at 7:50am in Chiang Mai (CNX)

Book Flight
US$785

6:14am - 7:30am
Sat Jul 19th 2025

37h 16m
St. Louis (STL) → Chiang Mai (CNX)

3 Stops

Sat Jul 19th 2025 Alaska Airlines · AS 4703 Depart at 6:14am from St. Louis (STL) Fly for 4h 23m Arrive at 8:37am in Los Angeles (LAX)

Layover in Los Angeles for 5h 43m

Sat Jul 19th 2025 Singapore Airlines · SQ 11 Depart at 2:20pm from Los Angeles (LAX) Fly for 11h 30m Arrive at 5:50pm in Tokyo (NRT)

Layover in Tokyo for 3h 25m

Sun Jul 20th 2025 Thai AirAsia X · XJ 607 Depart at 9:15pm from Tokyo (NRT) Fly for 7h 25m Arrive at 2:40am in Bangkok (DMK)

Layover in Bangkok for 3h 35m

Mon Jul 21st 2025 Thai Lion Air · SL 502 Depart at 6:15am from Bangkok (DMK) Fly for 1h 15m Arrive at 7:30am in Chiang Mai (CNX)

Book Flight
US$786

6:14am - 6:40am
Sat Jul 19th 2025

36h 26m
St. Louis (STL) → Chiang Mai (CNX)

3 Stops

Sat Jul 19th 2025 Alaska Airlines · AS 4703 Depart at 6:14am from St. Louis (STL) Fly for 4h 23m Arrive at 8:37am in Los Angeles (LAX)

Layover in Los Angeles for 5h 43m

Sat Jul 19th 2025 Singapore Airlines · SQ 11 Depart at 2:20pm from Los Angeles (LAX) Fly for 11h 30m Arrive at 5:50pm in Tokyo (NRT)

Layover in Tokyo for 3h 25m

Sun Jul 20th 2025 Thai AirAsia X · XJ 607 Depart at 9:15pm from Tokyo (NRT) Fly for 7h 25m Arrive at 2:40am in Bangkok (DMK)

Layover in Bangkok for 2h 50m

Mon Jul 21st 2025 Thai AirAsia · FD 3416 Depart at 5:30am from Bangkok (DMK) Fly for 1h 10m Arrive at 6:40am in Chiang Mai (CNX)

Book Flight
US$860

7:38pm - 1:40pm
Tue Jul 22nd 2025

30h 2m
St. Louis (STL) → Chiang Mai (CNX)

3 Stops

Tue Jul 22nd 2025 Cathay Pacific · CX 7659 Depart at 7:38pm from St. Louis (STL) Fly for 1h 56m Arrive at 9:34pm in Dallas (DFW)

Layover in Dallas for 1h 21m

Tue Jul 22nd 2025 Cathay Pacific · CX 875 Depart at 10:55pm from Dallas (DFW) Fly for 16h 40m Arrive at 4:35am in Hong Kong (HKG)

Layover in Hong Kong for 3h 25m

Thu Jul 24th 2025 Cathay Pacific · CX 705 Depart at 8:00am from Hong Kong (HKG) Fly for 3h 0m Arrive at 10:00am in Bangkok (BKK)

Layover in Bangkok for 2h 20m

Thu Jul 24th 2025 Thai AirAsia · FD 4118 Depart at 12:20pm from Bangkok (BKK) Fly for 1h 20m Arrive at 1:40pm in Chiang Mai (CNX)

Book Flight
US$870

7:32pm - 10:25am
Tue Jul 22nd 2025

26h 53m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Tue Jul 22nd 2025 Alaska Airlines · AS 291 Depart at 7:32pm from St. Louis (STL) Fly for 4h 28m Arrive at 10:00pm in Seattle (SEA)

Layover in Seattle for 3h 10m

Wed Jul 23rd 2025 EVA Air · BR 23 Depart at 1:10am from Seattle (SEA) Fly for 12h 0m Arrive at 4:10am in Taipei (TPE)

Layover in Taipei for 3h 15m

Thu Jul 24th 2025 EVA Air · BR 257 Depart at 7:25am from Taipei (TPE) Fly for 4h 0m Arrive at 10:25am in Chiang Mai (CNX)

Book Flight
US$904

7:32pm - 10:20am
Mon Jul 21st 2025

26h 48m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Mon Jul 21st 2025 Hawaiian Airlines · HA 7125 Depart at 7:32pm from St. Louis (STL) Fly for 4h 28m Arrive at 10:00pm in Seattle (SEA)

Layover in Seattle for 3h 40m

Tue Jul 22nd 2025 China Airlines · CI 21 Depart at 1:40am from Seattle (SEA) Fly for 12h 25m Arrive at 5:05am in Taipei (TPE)

Layover in Taipei for 2h 25m

Wed Jul 23rd 2025 China Airlines · CI 851 Depart at 7:30am from Taipei (TPE) Fly for 3h 50m Arrive at 10:20am in Chiang Mai (CNX)

Book Flight
US$928

7:32pm - 4:20pm
Sun Jul 20th 2025

32h 48m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sun Jul 20th 2025 Hawaiian Airlines · HA 7125 Depart at 7:32pm from St. Louis (STL) Fly for 4h 28m Arrive at 10:00pm in Seattle (SEA)

Layover in Seattle for 3h 15m

Mon Jul 21st 2025 Starlux Airlines · JX 31 Depart at 1:15am from Seattle (SEA) Fly for 12h 10m Arrive at 4:25am in Taipei (TPE)

Layover in Taipei for 8h 55m

Tue Jul 22nd 2025 Starlux Airlines · JX 751 Depart at 1:20pm from Taipei (TPE) Fly for 4h 0m Arrive at 4:20pm in Chiang Mai (CNX)

Book Flight
US$930

7:32pm - 1:35pm
Sun Jul 20th 2025

30h 3m
St. Louis (STL) → Chiang Mai (CNX)

3 Stops

Sun Jul 20th 2025 Hawaiian Airlines · HA 7125 Depart at 7:32pm from St. Louis (STL) Fly for 4h 28m Arrive at 10:00pm in Seattle (SEA)

Layover in Seattle for 3h 40m

Mon Jul 21st 2025 China Airlines · CI 21 Depart at 1:40am from Seattle (SEA) Fly for 12h 25m Arrive at 5:05am in Taipei (TPE)

Layover in Taipei for 1h 55m

Tue Jul 22nd 2025 China Airlines · CI 833 Depart at 7:00am from Taipei (TPE) Fly for 3h 45m Arrive at 9:45am in Bangkok (BKK)

Layover in Bangkok for 2h 20m

Tue Jul 22nd 2025 Thai Vietjet · VZ 110 Depart at 12:05pm from Bangkok (BKK) Fly for 1h 30m Arrive at 1:35pm in Chiang Mai (CNX)

Book Flight
US$933

7:38pm - 1:45pm
Sat Jul 19th 2025

30h 7m
St. Louis (STL) → Chiang Mai (CNX)

3 Stops

Sat Jul 19th 2025 Cathay Pacific · CX 7659 Depart at 7:38pm from St. Louis (STL) Fly for 1h 56m Arrive at 9:34pm in Dallas (DFW)

Layover in Dallas for 1h 21m

Sat Jul 19th 2025 Cathay Pacific · CX 875 Depart at 10:55pm from Dallas (DFW) Fly for 16h 40m Arrive at 4:35am in Hong Kong (HKG)

Layover in Hong Kong for 3h 25m

Mon Jul 21st 2025 Cathay Pacific · CX 705 Depart at 8:00am from Hong Kong (HKG) Fly for 3h 0m Arrive at 10:00am in Bangkok (BKK)

Layover in Bangkok for 2h 25m

Mon Jul 21st 2025 Bangkok Airways · PG 217 Depart at 12:25pm from Bangkok (BKK) Fly for 1h 20m Arrive at 1:45pm in Chiang Mai (CNX)

Book Flight
US$951

7:38pm - 9:45am
Mon Jul 21st 2025

26h 7m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Mon Jul 21st 2025 Cathay Pacific · CX 7659 Depart at 7:38pm from St. Louis (STL) Fly for 1h 56m Arrive at 9:34pm in Dallas (DFW)

Layover in Dallas for 1h 21m

Mon Jul 21st 2025 Cathay Pacific · CX 875 Depart at 10:55pm from Dallas (DFW) Fly for 16h 40m Arrive at 4:35am in Hong Kong (HKG)

Layover in Hong Kong for 3h 15m

Wed Jul 23rd 2025 Hong Kong Express Airways · UO 736 Depart at 7:50am from Hong Kong (HKG) Fly for 2h 55m Arrive at 9:45am in Chiang Mai (CNX)

Book Flight
US$1029

7:00am - 9:55pm
Tue Jul 22nd 2025

26h 55m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Tue Jul 22nd 2025 Korean Air · KE 7036 Depart at 7:00am from St. Louis (STL) Fly for 1h 37m Arrive at 9:37am in Atlanta (ATL)

Layover in Atlanta for 3h 3m

Tue Jul 22nd 2025 Korean Air · KE 36 Depart at 12:40pm from Atlanta (ATL) Fly for 15h 10m Arrive at 4:50pm in Seoul (ICN)

Layover in Seoul for 1h 35m

Wed Jul 23rd 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1029

6:00am - 9:55pm
Tue Jul 22nd 2025

27h 55m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Tue Jul 22nd 2025 Korean Air · KE 3735 Depart at 6:00am from St. Louis (STL) Fly for 1h 38m Arrive at 8:38am in Atlanta (ATL)

Layover in Atlanta for 4h 2m

Tue Jul 22nd 2025 Korean Air · KE 36 Depart at 12:40pm from Atlanta (ATL) Fly for 15h 10m Arrive at 4:50pm in Seoul (ICN)

Layover in Seoul for 1h 35m

Wed Jul 23rd 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1041

7:32pm - 10:20am
Thu Jul 24th 2025

26h 48m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Thu Jul 24th 2025 Hawaiian Airlines · HA 7125 Depart at 7:32pm from St. Louis (STL) Fly for 4h 28m Arrive at 10:00pm in Seattle (SEA)

Layover in Seattle for 3h 40m

Fri Jul 25th 2025 China Airlines · CI 21 Depart at 1:40am from Seattle (SEA) Fly for 12h 25m Arrive at 5:05am in Taipei (TPE)

Layover in Taipei for 2h 25m

Sat Jul 26th 2025 China Airlines · CI 851 Depart at 7:30am from Taipei (TPE) Fly for 3h 50m Arrive at 10:20am in Chiang Mai (CNX)

Book Flight
US$1119

6:40am - 9:55pm
Tue Jul 22nd 2025

27h 15m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Tue Jul 22nd 2025 Korean Air · KE 3250 Depart at 6:40am from St. Louis (STL) Fly for 1h 34m Arrive at 9:14am in Detroit (DTW)

Layover in Detroit for 3h 36m

Tue Jul 22nd 2025 Korean Air · KE 7274 Depart at 12:50pm from Detroit (DTW) Fly for 14h 35m Arrive at 4:25pm in Seoul (ICN)

Layover in Seoul for 2h 0m

Wed Jul 23rd 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1119

7:10pm - 9:55pm
Mon Jul 21st 2025

38h 45m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Mon Jul 21st 2025 Korean Air · KE 7034 Depart at 7:10pm from St. Louis (STL) Fly for 1h 49m Arrive at 9:59pm in Atlanta (ATL)

Layover in Atlanta for 11h 46m

Tue Jul 22nd 2025 Korean Air · KE 5040 Depart at 9:45am from Atlanta (ATL) Fly for 15h 25m Arrive at 2:10pm in Seoul (ICN)

Layover in Seoul for 4h 15m

Wed Jul 23rd 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1119

7:10pm - 9:55pm
Mon Jul 21st 2025

38h 45m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Mon Jul 21st 2025 Korean Air · KE 7034 Depart at 7:10pm from St. Louis (STL) Fly for 1h 49m Arrive at 9:59pm in Atlanta (ATL)

Layover in Atlanta for 1h 46m

Mon Jul 21st 2025 Korean Air · KE 5036 Depart at 11:45pm from Atlanta (ATL) Fly for 15h 15m Arrive at 4:00am in Seoul (ICN)

Layover in Seoul for 14h 25m

Wed Jul 23rd 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1196

7:32pm - 10:20am
Sun Jul 20th 2025

26h 48m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sun Jul 20th 2025 Hawaiian Airlines · HA 7125 Depart at 7:32pm from St. Louis (STL) Fly for 4h 28m Arrive at 10:00pm in Seattle (SEA)

Layover in Seattle for 3h 40m

Mon Jul 21st 2025 China Airlines · CI 21 Depart at 1:40am from Seattle (SEA) Fly for 12h 25m Arrive at 5:05am in Taipei (TPE)

Layover in Taipei for 2h 25m

Tue Jul 22nd 2025 China Airlines · CI 851 Depart at 7:30am from Taipei (TPE) Fly for 3h 50m Arrive at 10:20am in Chiang Mai (CNX)

Book Flight
US$1245

7:32pm - 10:25am
Sat Jul 26th 2025

26h 53m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sat Jul 26th 2025 Hawaiian Airlines · HA 7125 Depart at 7:32pm from St. Louis (STL) Fly for 4h 28m Arrive at 10:00pm in Seattle (SEA)

Layover in Seattle for 3h 40m

Sun Jul 27th 2025 China Airlines · CI 21 Depart at 1:40am from Seattle (SEA) Fly for 12h 25m Arrive at 5:05am in Taipei (TPE)

Layover in Taipei for 2h 20m

Mon Jul 28th 2025 EVA Air · BR 257 Depart at 7:25am from Taipei (TPE) Fly for 4h 0m Arrive at 10:25am in Chiang Mai (CNX)

Book Flight
US$1315

7:32pm - 10:20am
Fri Jul 25th 2025

26h 48m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Fri Jul 25th 2025 Hawaiian Airlines · HA 7125 Depart at 7:32pm from St. Louis (STL) Fly for 4h 28m Arrive at 10:00pm in Seattle (SEA)

Layover in Seattle for 3h 15m

Sat Jul 26th 2025 Starlux Airlines · JX 31 Depart at 1:15am from Seattle (SEA) Fly for 12h 10m Arrive at 4:25am in Taipei (TPE)

Layover in Taipei for 3h 5m

Sun Jul 27th 2025 China Airlines · CI 851 Depart at 7:30am from Taipei (TPE) Fly for 3h 50m Arrive at 10:20am in Chiang Mai (CNX)

Book Flight
US$1325

7:32pm - 10:20am
Wed Jul 23rd 2025

26h 48m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Wed Jul 23rd 2025 Hawaiian Airlines · HA 7125 Depart at 7:32pm from St. Louis (STL) Fly for 4h 28m Arrive at 10:00pm in Seattle (SEA)

Layover in Seattle for 4h 10m

Thu Jul 24th 2025 EVA Air · BR 25 Depart at 2:10am from Seattle (SEA) Fly for 12h 0m Arrive at 5:10am in Taipei (TPE)

Layover in Taipei for 2h 20m

Fri Jul 25th 2025 China Airlines · CI 851 Depart at 7:30am from Taipei (TPE) Fly for 3h 50m Arrive at 10:20am in Chiang Mai (CNX)

Book Flight
US$1435

11:23am - 9:55pm
Sun Jul 20th 2025

22h 32m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sun Jul 20th 2025 Korean Air · KE 3830 Depart at 11:23am from St. Louis (STL) Fly for 1h 32m Arrive at 12:55pm in Minneapolis (MSP)

Layover in Minneapolis for 0h 45m

Sun Jul 20th 2025 Korean Air · KE 5034 Depart at 1:40pm from Minneapolis (MSP) Fly for 13h 40m Arrive at 5:20pm in Seoul (ICN)

Layover in Seoul for 1h 5m

Mon Jul 21st 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1435

7:00am - 9:55pm
Sun Jul 20th 2025

26h 55m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sun Jul 20th 2025 Korean Air · KE 7036 Depart at 7:00am from St. Louis (STL) Fly for 1h 36m Arrive at 9:36am in Atlanta (ATL)

Layover in Atlanta for 3h 4m

Sun Jul 20th 2025 Korean Air · KE 36 Depart at 12:40pm from Atlanta (ATL) Fly for 15h 10m Arrive at 4:50pm in Seoul (ICN)

Layover in Seoul for 1h 35m

Mon Jul 21st 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1435

6:40am - 9:55pm
Sun Jul 20th 2025

27h 15m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sun Jul 20th 2025 Korean Air · KE 3250 Depart at 6:40am from St. Louis (STL) Fly for 1h 34m Arrive at 9:14am in Detroit (DTW)

Layover in Detroit for 3h 36m

Sun Jul 20th 2025 Korean Air · KE 7274 Depart at 12:50pm from Detroit (DTW) Fly for 14h 35m Arrive at 4:25pm in Seoul (ICN)

Layover in Seoul for 2h 0m

Mon Jul 21st 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1435

6:00am - 9:55pm
Sun Jul 20th 2025

27h 55m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sun Jul 20th 2025 Korean Air · KE 3735 Depart at 6:00am from St. Louis (STL) Fly for 1h 38m Arrive at 8:38am in Atlanta (ATL)

Layover in Atlanta for 4h 2m

Sun Jul 20th 2025 Korean Air · KE 36 Depart at 12:40pm from Atlanta (ATL) Fly for 15h 10m Arrive at 4:50pm in Seoul (ICN)

Layover in Seoul for 1h 35m

Mon Jul 21st 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1435

5:23pm - 9:55pm
Sat Jul 19th 2025

40h 32m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sat Jul 19th 2025 Korean Air · KE 7118 Depart at 5:23pm from St. Louis (STL) Fly for 1h 50m Arrive at 8:13pm in Atlanta (ATL)

Layover in Atlanta for 3h 32m

Sat Jul 19th 2025 Korean Air · KE 5036 Depart at 11:45pm from Atlanta (ATL) Fly for 15h 15m Arrive at 4:00am in Seoul (ICN)

Layover in Seoul for 14h 25m

Mon Jul 21st 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1439

5:23pm - 9:55pm
Sat Jul 26th 2025

40h 32m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sat Jul 26th 2025 Korean Air · KE 7118 Depart at 5:23pm from St. Louis (STL) Fly for 1h 50m Arrive at 8:13pm in Atlanta (ATL)

Layover in Atlanta for 3h 32m

Sat Jul 26th 2025 Korean Air · KE 5036 Depart at 11:45pm from Atlanta (ATL) Fly for 15h 15m Arrive at 4:00am in Seoul (ICN)

Layover in Seoul for 14h 25m

Mon Jul 28th 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1439

3:42pm - 9:55pm
Sat Jul 26th 2025

42h 13m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sat Jul 26th 2025 Korean Air · KE 7034 Depart at 3:42pm from St. Louis (STL) Fly for 1h 43m Arrive at 6:25pm in Atlanta (ATL)

Layover in Atlanta for 5h 20m

Sat Jul 26th 2025 Korean Air · KE 5036 Depart at 11:45pm from Atlanta (ATL) Fly for 15h 15m Arrive at 4:00am in Seoul (ICN)

Layover in Seoul for 14h 25m

Mon Jul 28th 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1451

5:23pm - 9:55pm
Sat Jul 19th 2025

40h 32m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sat Jul 19th 2025 Korean Air · KE 7118 Depart at 5:23pm from St. Louis (STL) Fly for 1h 50m Arrive at 8:13pm in Atlanta (ATL)

Layover in Atlanta for 13h 32m

Sun Jul 20th 2025 Korean Air · KE 5040 Depart at 9:45am from Atlanta (ATL) Fly for 15h 25m Arrive at 2:10pm in Seoul (ICN)

Layover in Seoul for 4h 15m

Mon Jul 21st 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1455

5:23pm - 9:55pm
Sat Jul 26th 2025

40h 32m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sat Jul 26th 2025 Korean Air · KE 7118 Depart at 5:23pm from St. Louis (STL) Fly for 1h 50m Arrive at 8:13pm in Atlanta (ATL)

Layover in Atlanta for 13h 32m

Sun Jul 27th 2025 Korean Air · KE 5040 Depart at 9:45am from Atlanta (ATL) Fly for 15h 25m Arrive at 2:10pm in Seoul (ICN)

Layover in Seoul for 4h 15m

Mon Jul 28th 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1500

7:32pm - 10:20am
Wed Jul 23rd 2025

26h 48m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Wed Jul 23rd 2025 Hawaiian Airlines · HA 7125 Depart at 7:32pm from St. Louis (STL) Fly for 4h 28m Arrive at 10:00pm in Seattle (SEA)

Layover in Seattle for 4h 10m

Thu Jul 24th 2025 EVA Air · BR 25 Depart at 2:10am from Seattle (SEA) Fly for 12h 0m Arrive at 5:10am in Taipei (TPE)

Layover in Taipei for 2h 20m

Fri Jul 25th 2025 China Airlines · CI 851 Depart at 7:30am from Taipei (TPE) Fly for 3h 50m Arrive at 10:20am in Chiang Mai (CNX)

Book Flight
US$1850

7:15am - 9:55pm
Tue Jul 22nd 2025

26h 40m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Tue Jul 22nd 2025 Korean Air · KE 3277 Depart at 7:15am from St. Louis (STL) Fly for 3h 7m Arrive at 9:22am in Salt Lake City (SLC)

Layover in Salt Lake City for 2h 13m

Tue Jul 22nd 2025 Korean Air · KE 5024 Depart at 11:35am from Salt Lake City (SLC) Fly for 12h 45m Arrive at 3:20pm in Seoul (ICN)

Layover in Seoul for 3h 5m

Wed Jul 23rd 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$1919

7:15am - 9:55pm
Sun Jul 20th 2025

26h 40m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Sun Jul 20th 2025 Korean Air · KE 3277 Depart at 7:15am from St. Louis (STL) Fly for 3h 7m Arrive at 9:22am in Salt Lake City (SLC)

Layover in Salt Lake City for 2h 13m

Sun Jul 20th 2025 Korean Air · KE 5024 Depart at 11:35am from Salt Lake City (SLC) Fly for 12h 45m Arrive at 3:20pm in Seoul (ICN)

Layover in Seoul for 3h 5m

Mon Jul 21st 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$2230

3:30pm - 7:10pm
Sun Jul 20th 2025

39h 40m
St. Louis (STL) → Chiang Mai (CNX)

3 Stops

Sun Jul 20th 2025 Lufthansa · LH 449 Depart at 3:30pm from St. Louis (STL) Fly for 8h 55m Arrive at 7:25am in Frankfurt (FRA)

Layover in Frankfurt for 3h 45m

Mon Jul 21st 2025 Lufthansa · LH 6410 Depart at 11:10am from Frankfurt (FRA) Fly for 1h 25m Arrive at 12:35pm in Vienna (VIE)

Layover in Vienna for 11h 0m

Mon Jul 21st 2025 Austrian Airlines · OS 25 Depart at 11:35pm from Vienna (VIE) Fly for 10h 15m Arrive at 2:50pm in Bangkok (BKK)

Layover in Bangkok for 3h 0m

Tue Jul 22nd 2025 Austrian Airlines · OS 8683 Depart at 5:50pm from Bangkok (BKK) Fly for 1h 20m Arrive at 7:10pm in Chiang Mai (CNX)

Book Flight
US$2291

3:30pm - 7:10pm
Wed Jul 23rd 2025

39h 40m
St. Louis (STL) → Chiang Mai (CNX)

3 Stops

Wed Jul 23rd 2025 Lufthansa · LH 449 Depart at 3:30pm from St. Louis (STL) Fly for 8h 55m Arrive at 7:25am in Frankfurt (FRA)

Layover in Frankfurt for 3h 45m

Thu Jul 24th 2025 Lufthansa · LH 6410 Depart at 11:10am from Frankfurt (FRA) Fly for 1h 25m Arrive at 12:35pm in Vienna (VIE)

Layover in Vienna for 11h 0m

Thu Jul 24th 2025 Austrian Airlines · OS 25 Depart at 11:35pm from Vienna (VIE) Fly for 10h 15m Arrive at 2:50pm in Bangkok (BKK)

Layover in Bangkok for 3h 0m

Fri Jul 25th 2025 Austrian Airlines · OS 8683 Depart at 5:50pm from Bangkok (BKK) Fly for 1h 20m Arrive at 7:10pm in Chiang Mai (CNX)

Book Flight
US$2307

3:30pm - 7:10pm
Fri Jul 25th 2025

39h 40m
St. Louis (STL) → Chiang Mai (CNX)

3 Stops

Fri Jul 25th 2025 Lufthansa · LH 449 Depart at 3:30pm from St. Louis (STL) Fly for 8h 55m Arrive at 7:25am in Frankfurt (FRA)

Layover in Frankfurt for 2h 55m

Sat Jul 26th 2025 Lufthansa · LH 6328 Depart at 10:20am from Frankfurt (FRA) Fly for 1h 25m Arrive at 11:45am in Vienna (VIE)

Layover in Vienna for 11h 50m

Sat Jul 26th 2025 Austrian Airlines · OS 25 Depart at 11:35pm from Vienna (VIE) Fly for 10h 15m Arrive at 2:50pm in Bangkok (BKK)

Layover in Bangkok for 3h 0m

Sun Jul 27th 2025 Austrian Airlines · OS 8683 Depart at 5:50pm from Bangkok (BKK) Fly for 1h 20m Arrive at 7:10pm in Chiang Mai (CNX)

Book Flight
US$2700

7:10pm - 9:55pm
Thu Jul 24th 2025

38h 45m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Thu Jul 24th 2025 Korean Air · KE 7034 Depart at 7:10pm from St. Louis (STL) Fly for 1h 49m Arrive at 9:59pm in Atlanta (ATL)

Layover in Atlanta for 1h 46m

Thu Jul 24th 2025 Korean Air · KE 5036 Depart at 11:45pm from Atlanta (ATL) Fly for 15h 15m Arrive at 4:00am in Seoul (ICN)

Layover in Seoul for 14h 25m

Sat Jul 26th 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$2753

11:23am - 9:55pm
Fri Jul 25th 2025

22h 32m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Fri Jul 25th 2025 Korean Air · KE 3830 Depart at 11:23am from St. Louis (STL) Fly for 1h 32m Arrive at 12:55pm in Minneapolis (MSP)

Layover in Minneapolis for 0h 45m

Fri Jul 25th 2025 Korean Air · KE 5034 Depart at 1:40pm from Minneapolis (MSP) Fly for 13h 40m Arrive at 5:20pm in Seoul (ICN)

Layover in Seoul for 1h 5m

Sat Jul 26th 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$2753

6:40am - 9:55pm
Fri Jul 25th 2025

27h 15m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Fri Jul 25th 2025 Korean Air · KE 3250 Depart at 6:40am from St. Louis (STL) Fly for 1h 34m Arrive at 9:14am in Detroit (DTW)

Layover in Detroit for 3h 36m

Fri Jul 25th 2025 Korean Air · KE 7274 Depart at 12:50pm from Detroit (DTW) Fly for 14h 35m Arrive at 4:25pm in Seoul (ICN)

Layover in Seoul for 2h 0m

Sat Jul 26th 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$2753

7:00am - 9:55pm
Fri Jul 25th 2025

26h 55m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Fri Jul 25th 2025 Korean Air · KE 7036 Depart at 7:00am from St. Louis (STL) Fly for 1h 37m Arrive at 9:37am in Atlanta (ATL)

Layover in Atlanta for 3h 3m

Fri Jul 25th 2025 Korean Air · KE 36 Depart at 12:40pm from Atlanta (ATL) Fly for 15h 10m Arrive at 4:50pm in Seoul (ICN)

Layover in Seoul for 1h 35m

Sat Jul 26th 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$2753

6:00am - 9:55pm
Fri Jul 25th 2025

27h 55m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Fri Jul 25th 2025 Korean Air · KE 3735 Depart at 6:00am from St. Louis (STL) Fly for 1h 38m Arrive at 8:38am in Atlanta (ATL)

Layover in Atlanta for 4h 2m

Fri Jul 25th 2025 Korean Air · KE 36 Depart at 12:40pm from Atlanta (ATL) Fly for 15h 10m Arrive at 4:50pm in Seoul (ICN)

Layover in Seoul for 1h 35m

Sat Jul 26th 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$2753

7:10pm - 9:55pm
Thu Jul 24th 2025

38h 45m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Thu Jul 24th 2025 Korean Air · KE 7034 Depart at 7:10pm from St. Louis (STL) Fly for 1h 49m Arrive at 9:59pm in Atlanta (ATL)

Layover in Atlanta for 11h 46m

Fri Jul 25th 2025 Korean Air · KE 5040 Depart at 9:45am from Atlanta (ATL) Fly for 15h 25m Arrive at 2:10pm in Seoul (ICN)

Layover in Seoul for 4h 15m

Sat Jul 26th 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight
US$3106

7:15am - 9:55pm
Fri Jul 25th 2025

26h 40m
St. Louis (STL) → Chiang Mai (CNX)

2 Stops

Fri Jul 25th 2025 Korean Air · KE 3277 Depart at 7:15am from St. Louis (STL) Fly for 3h 7m Arrive at 9:22am in Salt Lake City (SLC)

Layover in Salt Lake City for 2h 13m

Fri Jul 25th 2025 Korean Air · KE 5024 Depart at 11:35am from Salt Lake City (SLC) Fly for 12h 45m Arrive at 3:20pm in Seoul (ICN)

Layover in Seoul for 3h 5m

Sat Jul 26th 2025 Korean Air · KE 667 Depart at 6:25pm from Seoul (ICN) Fly for 5h 30m Arrive at 9:55pm in Chiang Mai (CNX)

Book Flight

Sarah Belizaire

@sarahbb1

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@eyupitsjohn

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Roaming Sonaa

@roamingsonaa

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Read Sonaa's 7 Amazing Skyscanner Alternatives for Booking Travel

ANDY TRAVELS

@andy_travels

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Travel With Bender

@travelwitbender

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Read Josh's Ultimate Guide To Find Cheap One Way Flights

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.

Read Wesley's My Best Cheap Flight Hacks (Why Pay More?)

Cheap Flights from St. Louis to Chiang Mai (STL to CNX)

Sarah Belizaire

John Ford

Roaming Sonaa

ANDY TRAVELS

Travel With Bender

Wesley Mergard

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