Southwest Airlines
flight
WN 3621:
Multiple routes
FLIGHT SCHEDULE
Direct Flights:
Southwest Airlines WN3621
Effective 2026-03-05 through 2026-03-06
Mon
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Tue
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Wed
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Thu
Fri
Sat
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Sun
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Duration: 1:15, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-03-09 through 2026-04-06
Mon
Tue
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Wed
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Thu
Fri
Sat
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Sun
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Duration: 1:15, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-03-08 through 2026-04-05
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Duration: 2:55, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-03-10 through 2026-04-01
Mon
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Tue
Wed
Thu
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Fri
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Sat
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Sun
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Duration: 2:55, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-03-09 through 2026-04-06
Mon
Tue
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Wed
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Thu
Fri
Sat
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Sun
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Duration: 2:55, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-03-05 through 2026-03-06
Mon
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Tue
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Wed
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Thu
Fri
Sat
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Sun
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Duration: 2:55, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-02-14 through 2026-02-28
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Duration: 3:05, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-01-10 through 2026-02-07
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Duration: 1:00, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-08-08 through 2026-09-26
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Duration: 1:25, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-08-04 through 2026-09-30
Mon
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Tue
Wed
Thu
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Fri
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Sat
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Sun
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Duration: 1:25, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-11 through 2026-05-30
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Duration: 1:55, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-08-09 through 2026-09-27
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Duration: 1:25, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Operates only on 2026-01-05
Mon
Tue
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Wed
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Thu
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Fri
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Sat
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Sun
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Duration: 2:45, non-stop
Boeing 737-800 (73H)
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3621
Operates only on 2026-05-24
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Duration: 1:25, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-07 through 2026-06-03
Mon
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Tue
Wed
Thu
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Fri
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Sat
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Sun
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Duration: 1:25, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-11 through 2026-05-30
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Duration: 1:25, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-08-06 through 2026-09-28
Mon
Tue
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Wed
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Thu
Fri
Sat
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Sun
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Duration: 3:10, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-09 through 2026-06-01
Mon
Tue
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Wed
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Thu
Fri
Sat
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Sun
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Duration: 1:25, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Valid until 2026-01-01
Mon
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Tue
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Wed
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Thu
Fri
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Sat
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Sun
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Duration: 2:45, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Operates only on 2026-05-24
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Duration: 1:30, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-11 through 2026-05-30
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Duration: 1:30, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-12 through 2026-05-17
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Duration: 1:25, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Operates only on 2026-05-31
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Duration: 1:25, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-03-14 through 2026-04-04
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Duration: 2:50, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-07 through 2026-06-03
Mon
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Tue
Wed
Thu
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Fri
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Sat
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Sun
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Duration: 1:30, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3621
Operates only on 2026-03-07
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Duration: 2:50, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-09 through 2026-06-01
Mon
Tue
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Wed
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Thu
Fri
Sat
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Sun
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Duration: 1:25, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-12 through 2026-05-17
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Duration: 1:25, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Operates only on 2026-05-31
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Duration: 1:25, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3621
Effective 2026-06-06 through 2026-08-01
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Duration: 2:35, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Non-Direct Flights:
Southwest Airlines WN3621
Effective 2026-03-05 through 2026-04-06
Mon
Tue
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Wed
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Thu
Fri
Sat
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Sun
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Duration: 4:50, 1-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-11 through 2026-05-30
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Duration: 3:55, 1-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Non-Direct Flights:
Southwest Airlines WN3621
Operates only on 2026-05-24
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Duration: 3:30, 1-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Non-Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-07 through 2026-06-03
Mon
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Tue
Wed
Thu
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Fri
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Sat
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Sun
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Duration: 3:45, 1-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Non-Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-11 through 2026-05-30
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Duration: 3:30, 1-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Non-Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-09 through 2026-06-01
Mon
Tue
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Wed
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Thu
Fri
Sat
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Sun
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Duration: 3:30, 1-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-12 through 2026-05-17
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Duration: 3:30, 1-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
Southwest Airlines WN3621
Operates only on 2026-05-31
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Duration: 3:30, 1-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
Southwest Airlines WN3621
Effective 2026-04-11 through 2026-05-30
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Duration: 6:00, 2-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
This flight number is listed as serving the following routes:
- Islip (ISP) - Fort Lauderdale (FLL)
- Jackson (JAN) - Houston Hobby (HOU)
- Las Vegas Harry Reid (LAS) - New Orleans (MSY)
- Las Vegas Harry Reid (LAS) - Phoenix Sky Harbor (PHX)
- Louisville (SDF) - Nashville (BNA)
- Nashville (BNA) - Houston Hobby (HOU)
- Nashville (BNA) - Jackson (JAN)
- New York LaGuardia (LGA) - Kansas City (MCI)
- Oklahoma City (OKC) - Las Vegas Harry Reid (LAS)
- Orlando (MCO) - Cleveland (CLE)
- Phoenix Sky Harbor (PHX) - New Orleans (MSY)
- Ronald Reagan Washington (DCA) - Houston Hobby (HOU)
- Ronald Reagan Washington (DCA) - Jackson (JAN)
- Ronald Reagan Washington (DCA) - Nashville (BNA)
- San Jose (SJC) - San Diego (SAN)