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

FLIGHT SCHEDULE
Direct Flights:
Sun 11:00 Seattle-Tacoma (SEA) 16:50 Saint Louis (STL) 2 Southwest Airlines WN 140 Non-stop Boeing 737-800 (73H) 3:50 Effective 2026-06-07 through 2026-08-02
Daily 12:46 Seattle-Tacoma (SEA) 18:37 Saint Louis (STL) 1 Alaska Airlines AS 291 Non-stop Boeing 737 (73J) 3:51 Effective 2026-06-10 through 2026-10-02
Daily 08:32 Seattle-Tacoma (SEA) 14:26 Saint Louis (STL) 1 Alaska Airlines AS 388 Non-stop Boeing 737 (73J) 3:54 Effective from 2026-06-10
Daily 10:28 Seattle-Tacoma (SEA) 16:26 Saint Louis (STL) 1 Alaska Airlines AS 388 Non-stop Boeing 737 (73J) 3:58 Valid until 2026-01-06
Fri 17:00 Seattle-Tacoma (SEA) 22:46 Saint Louis (STL) 1 Alaska Airlines AS 388 Non-stop Boeing 737 MAX 9 (7M9) 3:46 Operates only on 2026-01-09
Fri 17:00 Seattle-Tacoma (SEA) 22:46 Saint Louis (STL) 1 Alaska Airlines AS 388 Non-stop Boeing 737 (73J) 3:46 Operates only on 2026-01-16
Fri 17:00 Seattle-Tacoma (SEA) 22:46 Saint Louis (STL) 1 Alaska Airlines AS 388 Non-stop Boeing 737 MAX 9 (7M9) 3:46 Effective 2026-01-23 through 2026-02-06
Sat 17:56 Seattle-Tacoma (SEA) 23:50 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737-800 (73H) 3:54 Operates only on 2026-01-03
Mon,Tue,Sun 18:05 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737 MAX 9 (7M9) 3:54 Valid until 2026-01-04
Mon,Wed-Fri 18:05 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737 (73J) 3:54 Valid until 2026-01-05
Daily 18:06 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 472 Non-stop Boeing 737 (73J) 3:53 Effective from 2026-06-10
Wed 18:00 Seattle-Tacoma (SEA) 23:56 Saint Louis (STL) 1 Alaska Airlines AS 615 Non-stop Boeing 737 (73J) 3:56 Operates only on 2026-03-18
Daily 18:00 Seattle-Tacoma (SEA) 23:55 Saint Louis (STL) 1 Alaska Airlines AS 615 Non-stop Boeing 737 (73J) 3:55 Effective 2026-03-19 through 2026-05-12
Daily 18:04 Seattle-Tacoma (SEA) 00:04 Saint Louis (STL) 1 Alaska Airlines AS 615 Non-stop Boeing 737 (73J) 4:00 Effective 2026-05-13 through 2026-06-09 The flight arrives 1 day after departure.
Thu,Fri,Sun 18:07 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 615 Non-stop Boeing 737 (73J) 3:52 Effective 2026-02-12 through 2026-02-22
Mon 18:07 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 615 Non-stop Boeing 737 MAX 9 (7M9) 3:52 Operates only on 2026-02-16
Mon,Thu,Fri,Sun 18:07 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 615 Non-stop Boeing 737 (73J) 3:52 Effective 2026-02-23 through 2026-03-09
Thu 18:07 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 615 Non-stop Boeing 737 MAX 9 (7M9) 3:52 Operates only on 2026-03-12
Fri,Sun 18:07 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 615 Non-stop Boeing 737 (73J) 3:52 Effective 2026-03-13 through 2026-03-15
Mon 18:07 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 615 Non-stop Boeing 737-800 (73H) 3:52 Operates only on 2026-03-16
Tue-Thu,Sun 07:55 Seattle-Tacoma (SEA) 13:54 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 MAX 9 (7M9) 3:59 Effective 2026-01-07 through 2026-01-15
Fri 07:55 Seattle-Tacoma (SEA) 13:54 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 MAX 8 (7M8) 3:59 Operates only on 2026-01-09
Mon,Sun 07:55 Seattle-Tacoma (SEA) 13:54 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 (73J) 3:59 Effective 2026-01-12 through 2026-01-19
Tue-Fri 07:55 Seattle-Tacoma (SEA) 13:54 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 MAX 9 (7M9) 3:59 Effective 2026-01-16 through 2026-01-22
Mon,Fri,Sun 07:55 Seattle-Tacoma (SEA) 13:54 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 (73J) 3:59 Effective 2026-01-23 through 2026-01-30
Tue-Thu,Sun 07:55 Seattle-Tacoma (SEA) 13:54 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 MAX 9 (7M9) 3:59 Effective 2026-01-27 through 2026-02-05
Mon 07:55 Seattle-Tacoma (SEA) 13:54 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 MAX 8 (7M8) 3:59 Operates only on 2026-02-02
Fri,Sun 07:55 Seattle-Tacoma (SEA) 13:54 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 (73J) 3:59 Effective 2026-02-06 through 2026-02-08
Mon 07:55 Seattle-Tacoma (SEA) 13:54 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 MAX 9 (7M9) 3:59 Operates only on 2026-02-09
Tue,Wed 07:55 Seattle-Tacoma (SEA) 13:54 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 MAX 8 (7M8) 3:59 Effective 2026-02-10 through 2026-02-11
Tue-Fri 07:55 Seattle-Tacoma (SEA) 13:51 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 (73J) 3:56 Effective 2026-02-12 through 2026-02-19
Mon,Sat 07:55 Seattle-Tacoma (SEA) 13:51 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 MAX 9 (7M9) 3:56 Effective 2026-02-14 through 2026-02-21
Fri 07:55 Seattle-Tacoma (SEA) 13:51 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 MAX 8 (7M8) 3:56 Operates only on 2026-02-20
Mon-Fri 07:55 Seattle-Tacoma (SEA) 13:51 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 (73J) 3:56 Effective 2026-02-23 through 2026-03-06
Sat 07:55 Seattle-Tacoma (SEA) 13:51 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 MAX 9 (7M9) 3:56 Operates only on 2026-02-28
Mon-Sat 07:55 Seattle-Tacoma (SEA) 13:51 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 (73J) 3:56 Effective 2026-03-07 through 2026-03-14
Mon,Tue 07:55 Seattle-Tacoma (SEA) 13:51 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 MAX 9 (7M9) 3:56 Effective 2026-03-16 through 2026-03-17
Wed 08:00 Seattle-Tacoma (SEA) 13:52 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 (73J) 3:52 Operates only on 2026-03-18
Daily 08:00 Seattle-Tacoma (SEA) 14:11 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 (73J) 4:11 Effective 2026-03-19 through 2026-05-12
Daily 08:11 Seattle-Tacoma (SEA) 14:07 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 (73J) 3:56 Effective 2026-05-13 through 2026-06-09
Sun 08:25 Seattle-Tacoma (SEA) 14:23 Saint Louis (STL) 1 Alaska Airlines AS 618 Non-stop Boeing 737 MAX 9 (7M9) 3:58 Effective 2026-02-15 through 2026-03-15
Daily 11:25 Seattle-Tacoma (SEA) 17:22 Saint Louis (STL) 1 Alaska Airlines AS 647 Non-stop Boeing 737 (73J) 3:57 Effective 2026-05-13 through 2026-06-09
Tue 18:05 Seattle-Tacoma (SEA) 23:59 Saint Louis (STL) 1 Alaska Airlines AS 1444 Non-stop Boeing 737 MAX 9 (7M9) 3:54 Operates only on 2026-01-06
Mon,Thu,Fri 09:00 Seattle-Tacoma (SEA) 14:50 Saint Louis (STL) 2 Southwest Airlines WN 3632 Non-stop Boeing 737 MAX 8 (7M8) 3:50 Effective 2026-06-04 through 2026-08-03
Tue,Wed 09:30 Seattle-Tacoma (SEA) 15:20 Saint Louis (STL) 2 Southwest Airlines WN 3632 Non-stop Boeing 737-800 (73H) 3:50 Effective 2026-06-09 through 2026-07-29
Sat 09:40 Seattle-Tacoma (SEA) 15:30 Saint Louis (STL) 2 Southwest Airlines WN 4060 Non-stop Boeing 737 MAX 8 (7M8) 3:50 Effective 2026-08-08 through 2026-09-26
Sun 11:20 Seattle-Tacoma (SEA) 17:15 Saint Louis (STL) 2 Southwest Airlines WN 4060 Non-stop Boeing 737-800 (73H) 3:55 Effective 2026-08-09 through 2026-09-27
Mon,Thu,Fri 12:05 Seattle-Tacoma (SEA) 18:05 Saint Louis (STL) 2 Southwest Airlines WN 4060 Non-stop Boeing 737-700 (Scimitar Winglets) 4:00 Effective 2026-08-06 through 2026-09-28
Sat 12:00 Seattle-Tacoma (SEA) 18:00 Saint Louis (STL) 2 Southwest Airlines WN 4619 Non-stop Boeing 737-700 (Scimitar Winglets) 4:00 Effective 2026-06-06 through 2026-08-01
Non-Direct Flights:
Sun 14:25 Seattle-Tacoma (SEA) 22:50 Saint Louis (STL) 2 Southwest Airlines WN 1975 1-stop Boeing 737 MAX 8 (7M8) 6:25 Operates only on 2026-05-24

1 2 3 4

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 3:46 and 4:11.

Return (STL-SEA) flights

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

FLIGHT SCHEDULE

Direct Flights:

Southwest Airlines WN140

11:00

Seattle-Tacoma (SEA)

16:50

Saint Louis (STL) 2

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:50, non-stop
Boeing 737-800 (73H)

Direct Flights:

Alaska Airlines AS291

12:46

Seattle-Tacoma (SEA)

18:37

Saint Louis (STL) 1

Effective 2026-06-10 through 2026-10-02

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 3:51, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS388

08:32

Seattle-Tacoma (SEA)

14:26

Saint Louis (STL) 1

Effective from 2026-06-10

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 3:54, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS388

10:28

Seattle-Tacoma (SEA)

16:26

Saint Louis (STL) 1

Valid until 2026-01-06

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 3:58, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS388

17:00

Seattle-Tacoma (SEA)

22:46

Saint Louis (STL) 1

Operates only on 2026-01-09

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 3:46, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS388

17:00

Seattle-Tacoma (SEA)

22:46

Saint Louis (STL) 1

Operates only on 2026-01-16

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 3:46, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS388

17:00

Seattle-Tacoma (SEA)

22:46

Saint Louis (STL) 1

Effective 2026-01-23 through 2026-02-06

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 3:46, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS472

17:56

Seattle-Tacoma (SEA)

23:50

Saint Louis (STL) 1

Operates only on 2026-01-03

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:54, non-stop
Boeing 737-800 (73H)

Direct Flights:

Alaska Airlines AS472

18:05

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Valid until 2026-01-04

Mon

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:54, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS472

18:05

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Valid until 2026-01-05

Mon

Tue
-

Wed

Thu

Fri

Sat
-

Sun
-

Duration: 3:54, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS472

18:06

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Effective from 2026-06-10

Mon

Tue

Wed

Thu

Fri

Sat

Sun

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

Direct Flights:

Alaska Airlines AS615

18:00

Seattle-Tacoma (SEA)

23:56

Saint Louis (STL) 1

Operates only on 2026-03-18

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

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

Direct Flights:

Alaska Airlines AS615

18:00

Seattle-Tacoma (SEA)

23:55

Saint Louis (STL) 1

Effective 2026-03-19 through 2026-05-12

Mon

Tue

Wed

Thu

Fri

Sat

Sun

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

Direct Flights:

Alaska Airlines AS615

18:04

Seattle-Tacoma (SEA)

00:04(+1)

Saint Louis (STL) 1

Effective 2026-05-13 through 2026-06-09

Mon

Tue

Wed

Thu

Fri

Sat

Sun

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

Direct Flights:

Alaska Airlines AS615

18:07

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Effective 2026-02-12 through 2026-02-22

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 3:52, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS615

18:07

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Operates only on 2026-02-16

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:52, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS615

18:07

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Effective 2026-02-23 through 2026-03-09

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 3:52, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS615

18:07

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Operates only on 2026-03-12

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Duration: 3:52, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS615

18:07

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Effective 2026-03-13 through 2026-03-15

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun

Duration: 3:52, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS615

18:07

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Operates only on 2026-03-16

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:52, non-stop
Boeing 737-800 (73H)

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:54

Saint Louis (STL) 1

Effective 2026-01-07 through 2026-01-15

Mon
-

Tue

Wed

Thu

Fri
-

Sat
-

Sun

Duration: 3:59, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:54

Saint Louis (STL) 1

Operates only on 2026-01-09

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 3:59, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:54

Saint Louis (STL) 1

Effective 2026-01-12 through 2026-01-19

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

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

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:54

Saint Louis (STL) 1

Effective 2026-01-16 through 2026-01-22

Mon
-

Tue

Wed

Thu

Fri

Sat
-

Sun
-

Duration: 3:59, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:54

Saint Louis (STL) 1

Effective 2026-01-23 through 2026-01-30

Mon

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun

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

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:54

Saint Louis (STL) 1

Effective 2026-01-27 through 2026-02-05

Mon
-

Tue

Wed

Thu

Fri
-

Sat
-

Sun

Duration: 3:59, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:54

Saint Louis (STL) 1

Operates only on 2026-02-02

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:59, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:54

Saint Louis (STL) 1

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun

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

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:54

Saint Louis (STL) 1

Operates only on 2026-02-09

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:59, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:54

Saint Louis (STL) 1

Effective 2026-02-10 through 2026-02-11

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:59, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:51

Saint Louis (STL) 1

Effective 2026-02-12 through 2026-02-19

Mon
-

Tue

Wed

Thu

Fri

Sat
-

Sun
-

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

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:51

Saint Louis (STL) 1

Effective 2026-02-14 through 2026-02-21

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

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

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:51

Saint Louis (STL) 1

Operates only on 2026-02-20

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 3:56, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:51

Saint Louis (STL) 1

Effective 2026-02-23 through 2026-03-06

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun
-

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

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:51

Saint Louis (STL) 1

Operates only on 2026-02-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

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

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:51

Saint Louis (STL) 1

Effective 2026-03-07 through 2026-03-14

Mon

Tue

Wed

Thu

Fri

Sat

Sun
-

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

Direct Flights:

Alaska Airlines AS618

07:55

Seattle-Tacoma (SEA)

13:51

Saint Louis (STL) 1

Effective 2026-03-16 through 2026-03-17

Mon

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

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

Direct Flights:

Alaska Airlines AS618

08:00

Seattle-Tacoma (SEA)

13:52

Saint Louis (STL) 1

Operates only on 2026-03-18

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:52, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS618

08:00

Seattle-Tacoma (SEA)

14:11

Saint Louis (STL) 1

Effective 2026-03-19 through 2026-05-12

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 4:11, non-stop
Boeing 737 (73J)

Direct Flights:

Alaska Airlines AS618

08:11

Seattle-Tacoma (SEA)

14:07

Saint Louis (STL) 1

Effective 2026-05-13 through 2026-06-09

Mon

Tue

Wed

Thu

Fri

Sat

Sun

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

Direct Flights:

Alaska Airlines AS618

08:25

Seattle-Tacoma (SEA)

14:23

Saint Louis (STL) 1

Effective 2026-02-15 through 2026-03-15

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:58, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Alaska Airlines AS647

11:25

Seattle-Tacoma (SEA)

17:22

Saint Louis (STL) 1

Effective 2026-05-13 through 2026-06-09

Mon

Tue

Wed

Thu

Fri

Sat

Sun

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

Direct Flights:

Alaska Airlines AS1444

18:05

Seattle-Tacoma (SEA)

23:59

Saint Louis (STL) 1

Operates only on 2026-01-06

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:54, non-stop
Boeing 737 MAX 9 (7M9)

Direct Flights:

Southwest Airlines WN3632

09:00

Seattle-Tacoma (SEA)

14:50

Saint Louis (STL) 2

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

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 3:50, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN3632

09:30

Seattle-Tacoma (SEA)

15:20

Saint Louis (STL) 2

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

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:50, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4060

09:40

Seattle-Tacoma (SEA)

15:30

Saint Louis (STL) 2

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:50, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4060

11:20

Seattle-Tacoma (SEA)

17:15

Saint Louis (STL) 2

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4060

12:05

Seattle-Tacoma (SEA)

18:05

Saint Louis (STL) 2

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

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 4:00, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN4619

12:00

Seattle-Tacoma (SEA)

18:00

Saint Louis (STL) 2

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 4:00, non-stop
Boeing 737-700 (Scimitar Winglets)

Non-Direct Flights:

Southwest Airlines WN1975

14:25

Seattle-Tacoma (SEA)

22:50

Saint Louis (STL) 2

Operates only on 2026-05-24

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

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

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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 3:46 and 4:11.

Return (STL-SEA) flights

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