All airlines flying from Seattle-Tacoma (SEA) to Saint Louis (STL).

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FLIGHT SCHEDULE
Direct Flights:
Daily 18:06 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737 (73J) 3:53 Effective 2025-06-12 through 2025-07-03
Mon-Thu,Sat,Sun 18:06 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737 (73J) 3:53 Effective 2025-07-05 through 2025-07-17
Fri 18:06 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737 MAX 9 (7M9) 3:53 Operates only on 2025-07-11
Tue,Wed,Fri-Sun 18:06 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737 (73J) 3:53 Effective 2025-07-18 through 2025-07-27
Mon,Thu 18:06 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737 MAX 9 (7M9) 3:53 Effective 2025-07-21 through 2025-07-24
Mon-Wed,Fri-Sun 18:06 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737 (73J) 3:53 Effective 2025-07-28 through 2025-08-06
Thu 18:06 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737 MAX 9 (7M9) 3:53 Operates only on 2025-07-31
Daily 18:06 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737 (73J) 3:53 Effective 2025-08-07 through 2025-08-18
Tue 18:06 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737 MAX 9 (7M9) 3:53 Operates only on 2025-08-19
Thu 08:11 Seattle-Tacoma (SEA) 14:07 Saint Louis (STL) 1 Alaska Airlines AS 480 Non-stop Boeing 737 MAX 9 (7M9) 3:56 Operates only on 2025-05-15
Sat 08:45 Seattle-Tacoma (SEA) 14:35 Saint Louis (STL) 2 Southwest Airlines WN 1242 Non-stop Boeing 737-700 (73W) 3:50 Effective 2025-06-07 through 2025-08-02
Sun 09:30 Seattle-Tacoma (SEA) 15:20 Saint Louis (STL) 2 Southwest Airlines WN 1242 Non-stop Boeing 737-700 (73W) 3:50 Effective 2025-06-08 through 2025-08-03
Mon,Thu,Fri 11:05 Seattle-Tacoma (SEA) 16:55 Saint Louis (STL) 2 Southwest Airlines WN 1242 Non-stop Boeing 737-700 (73W) 3:50 Effective 2025-06-05 through 2025-07-03
Mon,Thu,Fri 11:05 Seattle-Tacoma (SEA) 16:55 Saint Louis (STL) 2 Southwest Airlines WN 1242 Non-stop Boeing 737-700 (73W) 3:50 Effective 2025-07-07 through 2025-08-04
Fri 11:20 Seattle-Tacoma (SEA) 17:10 Saint Louis (STL) 2 Southwest Airlines WN 1242 Non-stop Boeing 737-700 (73W) 3:50 Operates only on 2025-07-04
Tue,Wed 11:30 Seattle-Tacoma (SEA) 17:30 Saint Louis (STL) 2 Southwest Airlines WN 1242 Non-stop Boeing 737-800 (73H) 4:00 Effective 2025-06-10 through 2025-07-30
Mon,Thu,Fri 12:05 Seattle-Tacoma (SEA) 18:05 Saint Louis (STL) 2 Southwest Airlines WN 1572 Non-stop Boeing 737-700 (73W) 4:00 Effective 2025-08-07 through 2025-09-29
Sun 11:35 Seattle-Tacoma (SEA) 17:35 Saint Louis (STL) 2 Southwest Airlines WN 3318 Non-stop Boeing 737-700 (73W) 4:00 Effective 2025-08-10 through 2025-08-24
Sun 11:35 Seattle-Tacoma (SEA) 17:35 Saint Louis (STL) 2 Southwest Airlines WN 3318 Non-stop Boeing 737-700 (73W) 4:00 Effective 2025-09-07 through 2025-09-28
Sun 11:40 Seattle-Tacoma (SEA) 17:40 Saint Louis (STL) 2 Southwest Airlines WN 3318 Non-stop Boeing 737-800 (73H) 4:00 Operates only on 2025-08-31
Sat 11:15 Seattle-Tacoma (SEA) 17:10 Saint Louis (STL) 2 Southwest Airlines WN 3433 Non-stop Boeing 737-700 (73W) 3:55 Effective 2025-08-09 through 2025-09-27
Non-Direct Flights:
Mon,Thu,Fri 05:05 Seattle-Tacoma (SEA) 13:30 Saint Louis (STL) 2 Southwest Airlines WN 281 1-stop Boeing 737 MAX 8 (7M8) 6:25 Valid until 2025-06-02
Daily 07:00 Seattle-Tacoma (SEA) 15:44 Saint Louis (STL) 1 United Airlines UA 2618 1-stop Airbus A321neo (32Q) 6:44 Effective 2025-08-19 through 2025-09-24
Daily 07:00 Seattle-Tacoma (SEA) 15:38 Saint Louis (STL) 1 United Airlines UA 2618 1-stop Airbus A321neo (32Q) 6:38 Effective 2025-09-25 through 2025-10-25
Daily 07:00 Seattle-Tacoma (SEA) 15:21 Saint Louis (STL) 1 United Airlines UA 2618 1-stop Boeing 737 MAX 8 (7M8) 6:21 Effective from 2025-10-26
Mon,Thu,Fri 14:35 Seattle-Tacoma (SEA) 00:40 Saint Louis (STL) 2 Southwest Airlines WN 1490 2-stop Boeing 737-700 (73W) 8:05 Effective 2025-06-05 through 2025-07-03 The flight arrives 1 day after departure.
Mon,Thu,Fri 14:35 Seattle-Tacoma (SEA) 00:40 Saint Louis (STL) 2 Southwest Airlines WN 1490 2-stop Boeing 737-700 (73W) 8:05 Effective 2025-07-07 through 2025-08-04 The flight arrives 1 day after departure.
Direct Codeshare Flights:
Thu 11:25 Seattle-Tacoma (SEA) 17:22 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 (73J) 3:57 Operates only on 2025-05-15 Codeshare flight, operated by Alaska Airlines.(AS 388)
Tue,Thu,Sat,Sun 11:25 Seattle-Tacoma (SEA) 17:22 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 MAX 9 (7M9) 3:57 Effective 2025-05-17 through 2025-05-29 Codeshare flight, operated by Alaska Airlines.(AS 388)
Fri,Sat 11:25 Seattle-Tacoma (SEA) 17:22 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 MAX 9 (7M9) 3:57 Effective 2025-05-30 through 2025-05-31 Codeshare flight, operated by Alaska Airlines.(AS 388)
Tue,Thu-Sun 11:25 Seattle-Tacoma (SEA) 17:18 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 MAX 9 (7M9) 3:53 Effective 2025-06-01 through 2025-06-10 Codeshare flight, operated by Alaska Airlines.(AS 388)
Tue,Thu-Sun 12:39 Seattle-Tacoma (SEA) 18:38 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 (73J) 3:59 Effective 2025-08-21 through 2025-10-03 Codeshare flight, operated by Alaska Airlines.(AS 291)
Tue,Thu-Sat 12:46 Seattle-Tacoma (SEA) 18:35 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 MAX 9 (7M9) 3:49 Effective 2025-06-12 through 2025-06-21 Codeshare flight, operated by Alaska Airlines.(AS 291)
Sun 12:46 Seattle-Tacoma (SEA) 18:35 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 (73J) 3:49 Operates only on 2025-06-15 Codeshare flight, operated by Alaska Airlines.(AS 291)
Tue,Thu-Sun 12:46 Seattle-Tacoma (SEA) 18:35 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 MAX 9 (7M9) 3:49 Effective 2025-06-22 through 2025-06-29 Codeshare flight, operated by Alaska Airlines.(AS 291)
Tue,Fri 12:46 Seattle-Tacoma (SEA) 18:35 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 (73J) 3:49 Effective 2025-07-01 through 2025-07-08 Codeshare flight, operated by Alaska Airlines.(AS 291)
Thu,Sat,Sun 12:46 Seattle-Tacoma (SEA) 18:35 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 MAX 9 (7M9) 3:49 Effective 2025-07-03 through 2025-07-10 Codeshare flight, operated by Alaska Airlines.(AS 291)
Tue,Thu-Sun 12:46 Seattle-Tacoma (SEA) 18:35 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 MAX 9 (7M9) 3:49 Effective 2025-07-11 through 2025-07-20 Codeshare flight, operated by Alaska Airlines.(AS 291)
Tue 12:46 Seattle-Tacoma (SEA) 18:35 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 (73J) 3:49 Effective 2025-07-22 through 2025-08-12 Codeshare flight, operated by Alaska Airlines.(AS 291)
Thu-Sun 12:46 Seattle-Tacoma (SEA) 18:35 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 MAX 9 (7M9) 3:49 Effective 2025-07-24 through 2025-08-17 Codeshare flight, operated by Alaska Airlines.(AS 291)
Tue 12:46 Seattle-Tacoma (SEA) 18:35 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 MAX 9 (7M9) 3:49 Operates only on 2025-08-19 Codeshare flight, operated by Alaska Airlines.(AS 291)
Tue,Thu-Sun 18:00 Seattle-Tacoma (SEA) 23:56 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 (73J) 3:56 Effective 2025-10-04 through 2026-01-06 Codeshare flight, operated by Alaska Airlines.(AS 472)
Tue,Thu-Sun 18:00 Seattle-Tacoma (SEA) 23:56 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 (73J) 3:56 Effective from 2026-02-12 Codeshare flight, operated by Alaska Airlines.(AS 472)
Tue,Thu,Sat,Sun 18:03 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Singapore Airlines SQ 1735 Non-stop Boeing 737 MAX 9 (7M9) 3:56 Valid until 2025-05-13 Codeshare flight, operated by Alaska Airlines.(AS 472)
Thu 08:11 Seattle-Tacoma (SEA) 14:07 Saint Louis (STL) 1 Air Tahiti Nui TN 2444 Non-stop Boeing 737 MAX 9 (7M9) 3:56 Operates only on 2025-05-15 Codeshare flight, operated by Alaska Airlines.(AS 480)
Mon,Wed,Thu,Sat,Sun 18:03 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Finnair AY 2545 Non-stop Boeing 737 MAX 9 (7M9) 3:56 Effective 2025-05-03 through 2025-05-12 Codeshare flight, operated by Alaska Airlines.(AS 472)
Wed 18:03 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Finnair AY 2545 Non-stop Boeing 737 (73J) 3:56 Operates only on 2025-05-14 Codeshare flight, operated by Alaska Airlines.(AS 472)
Wed,Thu 18:03 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Finnair AY 2545 Non-stop Boeing 737 (73J) 3:56 Effective 2025-08-20 through 2025-08-21 Codeshare flight, operated by Alaska Airlines.(AS 472)
Thu 18:04 Seattle-Tacoma (SEA) 00:04 Saint Louis (STL) 1 Finnair AY 2545 Non-stop Boeing 737 (73J) 4:00 Operates only on 2025-05-15 Codeshare flight, operated by Alaska Airlines.(AS 238) The flight arrives 1 day after departure.
Mon,Wed,Thu,Sat,Sun 18:04 Seattle-Tacoma (SEA) 00:04 Saint Louis (STL) 1 Finnair AY 2545 Non-stop Boeing 737 MAX 9 (7M9) 4:00 Effective 2025-05-17 through 2025-05-22 Codeshare flight, operated by Alaska Airlines.(AS 238) The flight arrives 1 day after departure.

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A domestic route departing from the Seattle-Tacoma airport (SEA) and arriving at Saint Louis airport (STL).
The flight distance is 1704 miles, or 2743 km.
The timezone of the departure airport is UTC-8 , and the timezone of the arrival airport is UTC-6 . Current time at the point of departure is (loading...), and (loading...) at the point of arrival. There is a (loading...) hour time difference between the airports.
For direct flights, the flight time varies between 3:49 and 4:06.

Return (STL-SEA) flights

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All airlines flying from Seattle-Tacoma (SEA) to Saint Louis (STL).

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FLIGHT SCHEDULE

Direct Flights:

Alaska Airlines AS472

18:06

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Effective 2025-06-12 through 2025-07-03

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 3:53, non-stop
Boeing 737 (73J)

Alaska Airlines AS472

18:06

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Effective 2025-07-05 through 2025-07-17

Mon

Tue

Wed

Thu

Fri
-

Sat

Sun

Duration: 3:53, non-stop
Boeing 737 (73J)

Alaska Airlines AS472

18:06

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Operates only on 2025-07-11

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 3:53, non-stop
Boeing 737 MAX 9 (7M9)

Alaska Airlines AS472

18:06

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Effective 2025-07-18 through 2025-07-27

Mon
-

Tue

Wed

Thu
-

Fri

Sat

Sun

Duration: 3:53, non-stop
Boeing 737 (73J)

Alaska Airlines AS472

18:06

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Effective 2025-07-21 through 2025-07-24

Mon

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Duration: 3:53, non-stop
Boeing 737 MAX 9 (7M9)

Alaska Airlines AS472

18:06

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Effective 2025-07-28 through 2025-08-06

Mon

Tue

Wed

Thu
-

Fri

Sat

Sun

Duration: 3:53, non-stop
Boeing 737 (73J)

Alaska Airlines AS472

18:06

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Operates only on 2025-07-31

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Duration: 3:53, non-stop
Boeing 737 MAX 9 (7M9)

Alaska Airlines AS472

18:06

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Effective 2025-08-07 through 2025-08-18

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 3:53, non-stop
Boeing 737 (73J)

Alaska Airlines AS472

18:06

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Operates only on 2025-08-19

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:53, non-stop
Boeing 737 MAX 9 (7M9)

Alaska Airlines AS480

08:11

Seattle-Tacoma (SEA)

14:07

Saint Louis (STL) 1

Operates only on 2025-05-15

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Duration: 3:56, non-stop
Boeing 737 MAX 9 (7M9)

Southwest Airlines WN1242

08:45

Seattle-Tacoma (SEA)

14:35

Saint Louis (STL) 2

Effective 2025-06-07 through 2025-08-02

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:50, non-stop
Boeing 737-700 (73W)

Southwest Airlines WN1242

09:30

Seattle-Tacoma (SEA)

15:20

Saint Louis (STL) 2

Effective 2025-06-08 through 2025-08-03

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:50, non-stop
Boeing 737-700 (73W)

Southwest Airlines WN1242

11:05

Seattle-Tacoma (SEA)

16:55

Saint Louis (STL) 2

Effective 2025-06-05 through 2025-07-03

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 3:50, non-stop
Boeing 737-700 (73W)

Southwest Airlines WN1242

11:05

Seattle-Tacoma (SEA)

16:55

Saint Louis (STL) 2

Effective 2025-07-07 through 2025-08-04

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 3:50, non-stop
Boeing 737-700 (73W)

Southwest Airlines WN1242

11:20

Seattle-Tacoma (SEA)

17:10

Saint Louis (STL) 2

Operates only on 2025-07-04

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 3:50, non-stop
Boeing 737-700 (73W)

Southwest Airlines WN1242

11:30

Seattle-Tacoma (SEA)

17:30

Saint Louis (STL) 2

Effective 2025-06-10 through 2025-07-30

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 4:00, non-stop
Boeing 737-800 (73H)

Southwest Airlines WN1572

12:05

Seattle-Tacoma (SEA)

18:05

Saint Louis (STL) 2

Effective 2025-08-07 through 2025-09-29

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 4:00, non-stop
Boeing 737-700 (73W)

Southwest Airlines WN3318

11:35

Seattle-Tacoma (SEA)

17:35

Saint Louis (STL) 2

Effective 2025-08-10 through 2025-08-24

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 4:00, non-stop
Boeing 737-700 (73W)

Southwest Airlines WN3318

11:35

Seattle-Tacoma (SEA)

17:35

Saint Louis (STL) 2

Effective 2025-09-07 through 2025-09-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 4:00, non-stop
Boeing 737-700 (73W)

Southwest Airlines WN3318

11:40

Seattle-Tacoma (SEA)

17:40

Saint Louis (STL) 2

Operates only on 2025-08-31

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 4:00, non-stop
Boeing 737-800 (73H)

Southwest Airlines WN3433

11:15

Seattle-Tacoma (SEA)

17:10

Saint Louis (STL) 2

Effective 2025-08-09 through 2025-09-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:55, non-stop
Boeing 737-700 (73W)

Non-Direct Flights:

Southwest Airlines WN281

05:05

Seattle-Tacoma (SEA)

13:30

Saint Louis (STL) 2

Valid until 2025-06-02

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 6:25, 1-stop
Boeing 737 MAX 8 (7M8)

United Airlines UA2618

07:00

Seattle-Tacoma (SEA)

15:44

Saint Louis (STL) 1

Effective 2025-08-19 through 2025-09-24

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 6:44, 1-stop
Airbus A321neo (32Q)

United Airlines UA2618

07:00

Seattle-Tacoma (SEA)

15:38

Saint Louis (STL) 1

Effective 2025-09-25 through 2025-10-25

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 6:38, 1-stop
Airbus A321neo (32Q)

United Airlines UA2618

07:00

Seattle-Tacoma (SEA)

15:21

Saint Louis (STL) 1

Effective from 2025-10-26

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 6:21, 1-stop
Boeing 737 MAX 8 (7M8)

Southwest Airlines WN1490

14:35

Seattle-Tacoma (SEA)

00:40(+1)

Saint Louis (STL) 2

Effective 2025-06-05 through 2025-07-03

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 8:05, 2-stop
Boeing 737-700 (73W)
The flight arrives 1 day after departure.

Southwest Airlines WN1490

14:35

Seattle-Tacoma (SEA)

00:40(+1)

Saint Louis (STL) 2

Effective 2025-07-07 through 2025-08-04

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 8:05, 2-stop
Boeing 737-700 (73W)
The flight arrives 1 day after departure.

Direct Codeshare Flights:

Singapore Airlines SQ1735

11:25

Seattle-Tacoma (SEA)

17:22

Saint Louis (STL) 1

Operates only on 2025-05-15

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Alaska Airlines. (AS 388)

Duration: 3:57, non-stop
Boeing 737 (73J)

Singapore Airlines SQ1735

11:25

Seattle-Tacoma (SEA)

17:22

Saint Louis (STL) 1

Effective 2025-05-17 through 2025-05-29

Mon
-

Tue

Wed
-

Thu

Fri
-

Sat

Sun

Codeshare flight, operated by Alaska Airlines. (AS 388)

Duration: 3:57, non-stop
Boeing 737 MAX 9 (7M9)

Singapore Airlines SQ1735

11:25

Seattle-Tacoma (SEA)

17:22

Saint Louis (STL) 1

Effective 2025-05-30 through 2025-05-31

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun
-

Codeshare flight, operated by Alaska Airlines. (AS 388)

Duration: 3:57, non-stop
Boeing 737 MAX 9 (7M9)

Singapore Airlines SQ1735

11:25

Seattle-Tacoma (SEA)

17:18

Saint Louis (STL) 1

Effective 2025-06-01 through 2025-06-10

Mon
-

Tue

Wed
-

Thu

Fri

Sat

Sun

Codeshare flight, operated by Alaska Airlines. (AS 388)

Duration: 3:53, non-stop
Boeing 737 MAX 9 (7M9)

Singapore Airlines SQ1735

12:39

Seattle-Tacoma (SEA)

18:38

Saint Louis (STL) 1

Effective 2025-08-21 through 2025-10-03

Mon
-

Tue

Wed
-

Thu

Fri

Sat

Sun

Codeshare flight, operated by Alaska Airlines. (AS 291)

Duration: 3:59, non-stop
Boeing 737 (73J)

Singapore Airlines SQ1735

12:46

Seattle-Tacoma (SEA)

18:35

Saint Louis (STL) 1

Effective 2025-06-12 through 2025-06-21

Mon
-

Tue

Wed
-

Thu

Fri

Sat

Sun
-

Codeshare flight, operated by Alaska Airlines. (AS 291)

Duration: 3:49, non-stop
Boeing 737 MAX 9 (7M9)

Singapore Airlines SQ1735

12:46

Seattle-Tacoma (SEA)

18:35

Saint Louis (STL) 1

Operates only on 2025-06-15

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Codeshare flight, operated by Alaska Airlines. (AS 291)

Duration: 3:49, non-stop
Boeing 737 (73J)

Singapore Airlines SQ1735

12:46

Seattle-Tacoma (SEA)

18:35

Saint Louis (STL) 1

Effective 2025-06-22 through 2025-06-29

Mon
-

Tue

Wed
-

Thu

Fri

Sat

Sun

Codeshare flight, operated by Alaska Airlines. (AS 291)

Duration: 3:49, non-stop
Boeing 737 MAX 9 (7M9)

Singapore Airlines SQ1735

12:46

Seattle-Tacoma (SEA)

18:35

Saint Louis (STL) 1

Effective 2025-07-01 through 2025-07-08

Mon
-

Tue

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Codeshare flight, operated by Alaska Airlines. (AS 291)

Duration: 3:49, non-stop
Boeing 737 (73J)

Singapore Airlines SQ1735

12:46

Seattle-Tacoma (SEA)

18:35

Saint Louis (STL) 1

Effective 2025-07-03 through 2025-07-10

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat

Sun

Codeshare flight, operated by Alaska Airlines. (AS 291)

Duration: 3:49, non-stop
Boeing 737 MAX 9 (7M9)

Singapore Airlines SQ1735

12:46

Seattle-Tacoma (SEA)

18:35

Saint Louis (STL) 1

Effective 2025-07-11 through 2025-07-20

Mon
-

Tue

Wed
-

Thu

Fri

Sat

Sun

Codeshare flight, operated by Alaska Airlines. (AS 291)

Duration: 3:49, non-stop
Boeing 737 MAX 9 (7M9)

Singapore Airlines SQ1735

12:46

Seattle-Tacoma (SEA)

18:35

Saint Louis (STL) 1

Effective 2025-07-22 through 2025-08-12

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Alaska Airlines. (AS 291)

Duration: 3:49, non-stop
Boeing 737 (73J)

Singapore Airlines SQ1735

12:46

Seattle-Tacoma (SEA)

18:35

Saint Louis (STL) 1

Effective 2025-07-24 through 2025-08-17

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat

Sun

Codeshare flight, operated by Alaska Airlines. (AS 291)

Duration: 3:49, non-stop
Boeing 737 MAX 9 (7M9)

Singapore Airlines SQ1735

12:46

Seattle-Tacoma (SEA)

18:35

Saint Louis (STL) 1

Operates only on 2025-08-19

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Alaska Airlines. (AS 291)

Duration: 3:49, non-stop
Boeing 737 MAX 9 (7M9)

Singapore Airlines SQ1735

18:00

Seattle-Tacoma (SEA)

23:56

Saint Louis (STL) 1

Effective 2025-10-04 through 2026-01-06

Mon
-

Tue

Wed
-

Thu

Fri

Sat

Sun

Codeshare flight, operated by Alaska Airlines. (AS 472)

Duration: 3:56, non-stop
Boeing 737 (73J)

Singapore Airlines SQ1735

18:00

Seattle-Tacoma (SEA)

23:56

Saint Louis (STL) 1

Effective from 2026-02-12

Mon
-

Tue

Wed
-

Thu

Fri

Sat

Sun

Codeshare flight, operated by Alaska Airlines. (AS 472)

Duration: 3:56, non-stop
Boeing 737 (73J)

Singapore Airlines SQ1735

18:03

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Valid until 2025-05-13

Mon
-

Tue

Wed
-

Thu

Fri
-

Sat

Sun

Codeshare flight, operated by Alaska Airlines. (AS 472)

Duration: 3:56, non-stop
Boeing 737 MAX 9 (7M9)

Air Tahiti Nui TN2444

08:11

Seattle-Tacoma (SEA)

14:07

Saint Louis (STL) 1

Operates only on 2025-05-15

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Alaska Airlines. (AS 480)

Duration: 3:56, non-stop
Boeing 737 MAX 9 (7M9)

Finnair AY2545

18:03

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Effective 2025-05-03 through 2025-05-12

Mon

Tue
-

Wed

Thu

Fri
-

Sat

Sun

Codeshare flight, operated by Alaska Airlines. (AS 472)

Duration: 3:56, non-stop
Boeing 737 MAX 9 (7M9)

Finnair AY2545

18:03

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Operates only on 2025-05-14

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Alaska Airlines. (AS 472)

Duration: 3:56, non-stop
Boeing 737 (73J)

Finnair AY2545

18:03

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Effective 2025-08-20 through 2025-08-21

Mon
-

Tue
-

Wed

Thu

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Alaska Airlines. (AS 472)

Duration: 3:56, non-stop
Boeing 737 (73J)

Finnair AY2545

18:04

Seattle-Tacoma (SEA)

00:04(+1)

Saint Louis (STL) 1

Operates only on 2025-05-15

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by Alaska Airlines. (AS 238)

Duration: 4:00, non-stop
Boeing 737 (73J)
The flight arrives 1 day after departure.

Finnair AY2545

18:04

Seattle-Tacoma (SEA)

00:04(+1)

Saint Louis (STL) 1

Effective 2025-05-17 through 2025-05-22

Mon

Tue
-

Wed

Thu

Fri
-

Sat

Sun

Codeshare flight, operated by Alaska Airlines. (AS 238)

Duration: 4:00, non-stop
Boeing 737 MAX 9 (7M9)
The flight arrives 1 day after departure.

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A domestic route departing from the Seattle-Tacoma airport (SEA) and arriving at Saint Louis airport (STL).
The flight distance is 1704 miles, or 2743 km.
The timezone of the departure airport is UTC-8 , and the timezone of the arrival airport is UTC-6 . Current time at the point of departure is (loading...), and (loading...) at the point of arrival. There is a (loading...) hour time difference between the airports.
For direct flights, the flight time varies between 3:49 and 4:06.

Return (STL-SEA) flights

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