Alaska Airlines flight AS 421: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 08:00 Seattle-Tacoma (SEA) 12:20 San Jose del Cabo (SJD) 2
AS 421 Non-stop Boeing 737 (73J) 4:20 Effective 2025-10-26 through 2025-11-01
Daily 08:00 Seattle-Tacoma (SEA) 13:20 San Jose del Cabo (SJD) 2
AS 421 Non-stop Boeing 737 (73J) 4:20 Effective 2025-11-02 through 2025-12-01
Sat 08:00 Seattle-Tacoma (SEA) 13:20 San Jose del Cabo (SJD) 2
AS 421 Non-stop Boeing 737 (73J) 4:20 Effective 2025-12-06 through 2025-12-13
Daily 08:00 Seattle-Tacoma (SEA) 13:20 San Jose del Cabo (SJD) 2
AS 421 Non-stop Boeing 737 (73J) 4:20 Effective from 2025-12-18
Thu,Sun 15:30 Las Vegas Harry Reid (LAS) 3 17:11 San Francisco (SFO) 1
AS 421 Non-stop Boeing 737 MAX 9 (7M9) 1:41 Effective 2025-05-15 through 2025-05-22
Wed,Fri,Sat 15:30 Las Vegas Harry Reid (LAS) 3 17:11 San Francisco (SFO) 1
AS 421 Non-stop Boeing 737-900 (739) 1:41 Effective 2025-05-16 through 2025-05-21
Mon,Tue,Fri-Sun 15:30 Las Vegas Harry Reid (LAS) 3 17:11 San Francisco (SFO) 1
AS 421 Non-stop Boeing 737 (73J) 1:41 Effective 2025-05-19 through 2025-05-25
Mon,Wed,Thu,Sun 15:30 Las Vegas Harry Reid (LAS) 3 17:11 San Francisco (SFO) 1
AS 421 Non-stop Boeing 737-900 (739) 1:41 Effective 2025-05-26 through 2025-06-01
Mon,Tue,Fri,Sat 15:30 Las Vegas Harry Reid (LAS) 3 17:11 San Francisco (SFO) 1
AS 421 Non-stop Boeing 737 (73J) 1:41 Effective 2025-05-27 through 2025-06-07
Mon,Wed,Thu 15:30 Las Vegas Harry Reid (LAS) 3 17:11 San Francisco (SFO) 1
AS 421 Non-stop Boeing 737-900 (739) 1:41 Effective 2025-06-04 through 2025-06-09
Tue,Sun 15:30 Las Vegas Harry Reid (LAS) 3 17:11 San Francisco (SFO) 1
AS 421 Non-stop Boeing 737 (73J) 1:41 Effective 2025-06-08 through 2025-06-10
Wed 15:30 Las Vegas Harry Reid (LAS) 3 17:11 San Francisco (SFO) 1
AS 421 Non-stop Boeing 737-800 (73H) 1:41 Operates only on 2025-06-11
Fri 15:55 Seattle-Tacoma (SEA) 00:23 Boston Logan (BOS) B
AS 421 Non-stop Boeing 737 (73J) 5:28 Operates only on 2025-10-03
The flight arrives 1 day after departure.
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This flight number is listed as serving the following routes:


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Alaska Airlines flight AS 421: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Alaska Airlines AS421
08:00
Seattle-Tacoma (SEA)

12:20
San Jose del Cabo (SJD) 2
Effective 2025-10-26 through 2025-11-01
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:20, non-stop
Boeing 737 (73J)
Alaska Airlines AS421
08:00
Seattle-Tacoma (SEA)

13:20
San Jose del Cabo (SJD) 2
Effective 2025-11-02 through 2025-12-01
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:20, non-stop
Boeing 737 (73J)
Alaska Airlines AS421
08:00
Seattle-Tacoma (SEA)

13:20
San Jose del Cabo (SJD) 2
Effective 2025-12-06 through 2025-12-13
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 4:20, non-stop
Boeing 737 (73J)
Alaska Airlines AS421
08:00
Seattle-Tacoma (SEA)

13:20
San Jose del Cabo (SJD) 2
Effective from 2025-12-18
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 4:20, non-stop
Boeing 737 (73J)
Alaska Airlines AS421
15:30
Las Vegas Harry Reid (LAS) 3

17:11
San Francisco (SFO) 1
Effective 2025-05-15 through 2025-05-22
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
Duration: 1:41, non-stop
Boeing 737 MAX 9 (7M9)
Alaska Airlines AS421
15:30
Las Vegas Harry Reid (LAS) 3

17:11
San Francisco (SFO) 1
Effective 2025-05-16 through 2025-05-21
Mon
-
Tue
-
Wed
Thu
-
Fri
Sat
Sun
-
Duration: 1:41, non-stop
Boeing 737-900 (739)
Alaska Airlines AS421
15:30
Las Vegas Harry Reid (LAS) 3

17:11
San Francisco (SFO) 1
Effective 2025-05-19 through 2025-05-25
Mon
Tue
Wed
-
Thu
-
Fri
Sat
Sun
Duration: 1:41, non-stop
Boeing 737 (73J)
Alaska Airlines AS421
15:30
Las Vegas Harry Reid (LAS) 3

17:11
San Francisco (SFO) 1
Effective 2025-05-26 through 2025-06-01
Mon
Tue
-
Wed
Thu
Fri
-
Sat
-
Sun
Duration: 1:41, non-stop
Boeing 737-900 (739)
Alaska Airlines AS421
15:30
Las Vegas Harry Reid (LAS) 3

17:11
San Francisco (SFO) 1
Effective 2025-05-27 through 2025-06-07
Mon
Tue
Wed
-
Thu
-
Fri
Sat
Sun
-
Duration: 1:41, non-stop
Boeing 737 (73J)
Alaska Airlines AS421
15:30
Las Vegas Harry Reid (LAS) 3

17:11
San Francisco (SFO) 1
Effective 2025-06-04 through 2025-06-09
Mon
Tue
-
Wed
Thu
Fri
-
Sat
-
Sun
-
Duration: 1:41, non-stop
Boeing 737-900 (739)
Alaska Airlines AS421
15:30
Las Vegas Harry Reid (LAS) 3

17:11
San Francisco (SFO) 1
Effective 2025-06-08 through 2025-06-10
Mon
-
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:41, non-stop
Boeing 737 (73J)
Alaska Airlines AS421
15:30
Las Vegas Harry Reid (LAS) 3

17:11
San Francisco (SFO) 1
Operates only on 2025-06-11
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:41, non-stop
Boeing 737-800 (73H)
Alaska Airlines AS421
15:55
Seattle-Tacoma (SEA)

00:23(+1)
Boston Logan (BOS) B
Operates only on 2025-10-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Duration: 5:28, non-stop
Boeing 737 (73J)
The flight arrives 1 day after departure.
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This flight number is listed as serving the following routes:
  • Las Vegas Harry Reid (LAS) - San Francisco (SFO)
  • Seattle-Tacoma (SEA) - Boston Logan (BOS)
  • Seattle-Tacoma (SEA) - San Jose del Cabo (SJD)
All Alaska Airlines flights
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