Southwest Airlines flights from Saint Louis (STL) to Seattle-Tacoma (SEA).

FLIGHT SCHEDULE
Direct Flights:
Mon,Thu,Fri 08:25 Saint Louis (STL) 2 10:45 Seattle-Tacoma (SEA) Southwest Airlines WN 2190 Non-stop Boeing 737-800 (73H) 4:20 Effective 2026-08-06 through 2026-09-28
Sun 10:45 Saint Louis (STL) 2 13:05 Seattle-Tacoma (SEA) Southwest Airlines WN 2190 Non-stop Boeing 737-800 (73H) 4:20 Effective 2026-08-09 through 2026-09-27
Mon,Thu,Fri 11:40 Saint Louis (STL) 2 13:55 Seattle-Tacoma (SEA) Southwest Airlines WN 3981 Non-stop Boeing 737-800 (73H) 4:15 Effective 2026-06-04 through 2026-08-03
Sun 12:00 Saint Louis (STL) 2 14:15 Seattle-Tacoma (SEA) Southwest Airlines WN 3981 Non-stop Boeing 737-700 (Scimitar Winglets) 4:15 Effective 2026-06-07 through 2026-08-02
Sat 12:05 Saint Louis (STL) 2 14:20 Seattle-Tacoma (SEA) Southwest Airlines WN 3981 Non-stop Boeing 737 MAX 8 (7M8) 4:15 Effective 2026-06-06 through 2026-08-01
Tue,Wed 12:05 Saint Louis (STL) 2 14:20 Seattle-Tacoma (SEA) Southwest Airlines WN 3981 Non-stop Boeing 737-800 (73H) 4:15 Effective 2026-06-09 through 2026-07-29
Sat 14:20 Saint Louis (STL) 2 16:40 Seattle-Tacoma (SEA) Southwest Airlines WN 4070 Non-stop Boeing 737 MAX 8 (7M8) 4:20 Effective 2026-08-08 through 2026-09-26
Non-Direct Flights:
Tue,Wed 05:50 Saint Louis (STL) 2 10:20 Seattle-Tacoma (SEA) Southwest Airlines WN 1396 1-stop Boeing 737-700 (Scimitar Winglets) 6:30 Effective 2026-06-09 through 2026-07-29
Sun 15:35 Saint Louis (STL) 2 20:45 Seattle-Tacoma (SEA) Southwest Airlines WN 3890 1-stop Boeing 737-800 (73H) 7:10 Effective 2026-04-12 through 2026-05-17
Sun 15:35 Saint Louis (STL) 2 20:45 Seattle-Tacoma (SEA) Southwest Airlines WN 3890 1-stop Boeing 737-800 (73H) 7:10 Operates only on 2026-05-31
Fri,Sun 09:50 Saint Louis (STL) 2 19:10 Seattle-Tacoma (SEA) Southwest Airlines WN 2848 3-stop Boeing 737-700 (Scimitar Winglets) 11:20 Effective 2026-01-02 through 2026-01-04

A domestic route departing from the Saint Louis airport (STL) and arriving at Seattle-Tacoma airport (SEA).
The flight distance is 1704 miles, or 2743 km.
The timezone of the departure airport is UTC-6 , and the timezone of the arrival airport is UTC-8 . 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 4:15 and 4:20.

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FLIGHT SCHEDULE

Direct Flights:

Southwest Airlines WN2190

08:25

Saint Louis (STL) 2

10:45

Seattle-Tacoma (SEA)

Effective 2026-08-06 through 2026-09-28

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 4:20, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN2190

10:45

Saint Louis (STL) 2

13:05

Seattle-Tacoma (SEA)

Effective 2026-08-09 through 2026-09-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 4:20, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN3981

11:40

Saint Louis (STL) 2

13:55

Seattle-Tacoma (SEA)

Effective 2026-06-04 through 2026-08-03

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 4:15, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN3981

12:00

Saint Louis (STL) 2

14:15

Seattle-Tacoma (SEA)

Effective 2026-06-07 through 2026-08-02

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 4:15, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN3981

12:05

Saint Louis (STL) 2

14:20

Seattle-Tacoma (SEA)

Effective 2026-06-06 through 2026-08-01

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 4:15, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN3981

12:05

Saint Louis (STL) 2

14:20

Seattle-Tacoma (SEA)

Effective 2026-06-09 through 2026-07-29

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 4:15, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4070

14:20

Saint Louis (STL) 2

16:40

Seattle-Tacoma (SEA)

Effective 2026-08-08 through 2026-09-26

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 4:20, non-stop
Boeing 737 MAX 8 (7M8)

Non-Direct Flights:

Southwest Airlines WN1396

05:50

Saint Louis (STL) 2

10:20

Seattle-Tacoma (SEA)

Effective 2026-06-09 through 2026-07-29

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 6:30, 1-stop
Boeing 737-700 (Scimitar Winglets)

Non-Direct Flights:

Southwest Airlines WN3890

15:35

Saint Louis (STL) 2

20:45

Seattle-Tacoma (SEA)

Effective 2026-04-12 through 2026-05-17

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 7:10, 1-stop
Boeing 737-800 (73H)

Non-Direct Flights:

Southwest Airlines WN3890

15:35

Saint Louis (STL) 2

20:45

Seattle-Tacoma (SEA)

Operates only on 2026-05-31

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 7:10, 1-stop
Boeing 737-800 (73H)

Non-Direct Flights:

Southwest Airlines WN2848

09:50

Saint Louis (STL) 2

19:10

Seattle-Tacoma (SEA)

Effective 2026-01-02 through 2026-01-04

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun

Duration: 11:20, 3-stop
Boeing 737-700 (Scimitar Winglets)

A domestic route departing from the Saint Louis airport (STL) and arriving at Seattle-Tacoma airport (SEA).
The flight distance is 1704 miles, or 2743 km.
The timezone of the departure airport is UTC-6 , and the timezone of the arrival airport is UTC-8 . 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 4:15 and 4:20.

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