Alaska Airlines flight AS 521: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Mon,Wed-Sun 11:28 Seattle-Tacoma (SEA) 13:42 San Jose (SJC) B
AS 521 Non-stop Boeing 737 (73J) 2:14 Effective 2026-02-12 through 2026-02-23
Tue 11:28 Seattle-Tacoma (SEA) 13:42 San Jose (SJC) B
AS 521 Non-stop Boeing 737 MAX 9 (7M9) 2:14 Operates only on 2026-02-17
Daily 11:28 Seattle-Tacoma (SEA) 13:42 San Jose (SJC) B
AS 521 Non-stop Boeing 737 (73J) 2:14 Effective 2026-02-24 through 2026-03-15
Mon,Tue 11:28 Seattle-Tacoma (SEA) 13:42 San Jose (SJC) B
AS 521 Non-stop Boeing 737 MAX 9 (7M9) 2:14 Effective 2026-03-16 through 2026-03-17
Wed 12:30 Seattle-Tacoma (SEA) 14:42 San Jose (SJC) B
AS 521 Non-stop Boeing 737-800 (73H) 2:12 Operates only on 2026-01-07
Mon,Thu 12:30 Seattle-Tacoma (SEA) 14:42 San Jose (SJC) B
AS 521 Non-stop Boeing 737 MAX 9 (7M9) 2:12 Effective 2026-01-08 through 2026-01-12
Tue-Sun 12:30 Seattle-Tacoma (SEA) 14:42 San Jose (SJC) B
AS 521 Non-stop Boeing 737 (73J) 2:12 Effective 2026-01-09 through 2026-01-23
Mon 12:30 Seattle-Tacoma (SEA) 14:42 San Jose (SJC) B
AS 521 Non-stop Boeing 737 MAX 9 (7M9) 2:12 Operates only on 2026-01-19
Mon,Sat 12:30 Seattle-Tacoma (SEA) 14:42 San Jose (SJC) B
AS 521 Non-stop Boeing 737-800 (73H) 2:12 Effective 2026-01-24 through 2026-01-26
Thu-Sun 12:30 Seattle-Tacoma (SEA) 14:42 San Jose (SJC) B
AS 521 Non-stop Boeing 737 (73J) 2:12 Effective 2026-01-25 through 2026-02-01
Tue,Wed 12:30 Seattle-Tacoma (SEA) 14:42 San Jose (SJC) B
AS 521 Non-stop Boeing 737 MAX 9 (7M9) 2:12 Effective 2026-01-27 through 2026-01-28
Daily 12:30 Seattle-Tacoma (SEA) 14:42 San Jose (SJC) B
AS 521 Non-stop Boeing 737 (73J) 2:12 Effective 2026-02-02 through 2026-02-11
Daily 13:04 San Jose (SJC) B 15:15 Seattle-Tacoma (SEA)
AS 521 Non-stop Boeing 737 (73J) 2:11 Effective 2026-06-10 through 2026-08-18
Daily 13:34 Austin (AUS) 16:12 Seattle-Tacoma (SEA)
AS 521 Non-stop Boeing 737 (73J) 4:38 Effective 2026-05-13 through 2026-06-09
Daily 14:00 San Jose (SJC) B 16:11 Seattle-Tacoma (SEA)
AS 521 Non-stop Boeing 737 (73J) 2:11 Effective from 2026-08-19
Wed 14:35 Seattle-Tacoma (SEA) 16:44 San Jose (SJC) B
AS 521 Non-stop Boeing 737 (73J) 2:09 Operates only on 2026-03-18
Daily 14:35 Seattle-Tacoma (SEA) 16:45 San Jose (SJC) B
AS 521 Non-stop Boeing 737 (73J) 2:10 Effective 2026-03-19 through 2026-05-12
Thu 14:40 Seattle-Tacoma (SEA) 16:53 San Jose (SJC) B
AS 521 Non-stop Boeing 737 MAX 9 (7M9) 2:13 Valid until 2026-01-01
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This flight number is listed as serving the following routes:


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Alaska Airlines flight AS 521: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Alaska Airlines AS521
11:28
Seattle-Tacoma (SEA)

13:42
San Jose (SJC) B
Effective 2026-02-12 through 2026-02-23
Mon
Tue
-
Wed
Thu
Fri
Sat
Sun
Duration: 2:14, non-stop
Boeing 737 (73J)
Direct Flights:
Alaska Airlines AS521
11:28
Seattle-Tacoma (SEA)

13:42
San Jose (SJC) B
Operates only on 2026-02-17
Mon
-
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:14, non-stop
Boeing 737 MAX 9 (7M9)
Direct Flights:
Alaska Airlines AS521
11:28
Seattle-Tacoma (SEA)

13:42
San Jose (SJC) B
Effective 2026-02-24 through 2026-03-15
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:14, non-stop
Boeing 737 (73J)
Direct Flights:
Alaska Airlines AS521
11:28
Seattle-Tacoma (SEA)

13:42
San Jose (SJC) B
Effective 2026-03-16 through 2026-03-17
Mon
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:14, non-stop
Boeing 737 MAX 9 (7M9)
Direct Flights:
Alaska Airlines AS521
12:30
Seattle-Tacoma (SEA)

14:42
San Jose (SJC) B
Operates only on 2026-01-07
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:12, non-stop
Boeing 737-800 (73H)
Direct Flights:
Alaska Airlines AS521
12:30
Seattle-Tacoma (SEA)

14:42
San Jose (SJC) B
Effective 2026-01-08 through 2026-01-12
Mon
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 2:12, non-stop
Boeing 737 MAX 9 (7M9)
Direct Flights:
Alaska Airlines AS521
12:30
Seattle-Tacoma (SEA)

14:42
San Jose (SJC) B
Effective 2026-01-09 through 2026-01-23
Mon
-
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:12, non-stop
Boeing 737 (73J)
Direct Flights:
Alaska Airlines AS521
12:30
Seattle-Tacoma (SEA)

14:42
San Jose (SJC) B
Operates only on 2026-01-19
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:12, non-stop
Boeing 737 MAX 9 (7M9)
Direct Flights:
Alaska Airlines AS521
12:30
Seattle-Tacoma (SEA)

14:42
San Jose (SJC) B
Effective 2026-01-24 through 2026-01-26
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:12, non-stop
Boeing 737-800 (73H)
Direct Flights:
Alaska Airlines AS521
12:30
Seattle-Tacoma (SEA)

14:42
San Jose (SJC) B
Effective 2026-01-25 through 2026-02-01
Mon
-
Tue
-
Wed
-
Thu
Fri
Sat
Sun
Duration: 2:12, non-stop
Boeing 737 (73J)
Direct Flights:
Alaska Airlines AS521
12:30
Seattle-Tacoma (SEA)

14:42
San Jose (SJC) B
Effective 2026-01-27 through 2026-01-28
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:12, non-stop
Boeing 737 MAX 9 (7M9)
Direct Flights:
Alaska Airlines AS521
12:30
Seattle-Tacoma (SEA)

14:42
San Jose (SJC) B
Effective 2026-02-02 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:12, non-stop
Boeing 737 (73J)
Direct Flights:
Alaska Airlines AS521
13:04
San Jose (SJC) B

15:15
Seattle-Tacoma (SEA)
Effective 2026-06-10 through 2026-08-18
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:11, non-stop
Boeing 737 (73J)
Direct Flights:
Alaska Airlines AS521
13:34
Austin (AUS)

16:12
Seattle-Tacoma (SEA)
Effective 2026-05-13 through 2026-06-09
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:38, non-stop
Boeing 737 (73J)
Direct Flights:
Alaska Airlines AS521
14:00
San Jose (SJC) B

16:11
Seattle-Tacoma (SEA)
Effective from 2026-08-19
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:11, non-stop
Boeing 737 (73J)
Direct Flights:
Alaska Airlines AS521
14:35
Seattle-Tacoma (SEA)

16:44
San Jose (SJC) B
Operates only on 2026-03-18
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:09, non-stop
Boeing 737 (73J)
Direct Flights:
Alaska Airlines AS521
14:35
Seattle-Tacoma (SEA)

16:45
San Jose (SJC) B
Effective 2026-03-19 through 2026-05-12
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:10, non-stop
Boeing 737 (73J)
Direct Flights:
Alaska Airlines AS521
14:40
Seattle-Tacoma (SEA)

16:53
San Jose (SJC) B
Valid until 2026-01-01
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 2:13, non-stop
Boeing 737 MAX 9 (7M9)
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Parallax here
This flight number is listed as serving the following routes:
  • Austin (AUS) - Seattle-Tacoma (SEA)
  • San Jose (SJC) - Seattle-Tacoma (SEA)
All Alaska Airlines flights
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