Southwest Airlines
flight
WN 3940:
Multiple routes
FLIGHT SCHEDULE
Direct Flights:
Southwest Airlines WN3940
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 WN3940
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 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3940
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: 1:30, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3940
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: 1:30, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3940
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: 1:30, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3940
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 WN3940
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: 0:55, non-stop
Boeing 737-800 (73H)
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3940
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: 0:55, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3940
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: 0:55, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3940
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: 0:55, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3940
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: 0:50, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3940
Effective 2026-06-04 through 2026-08-03
Mon
Tue
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Wed
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Thu
Fri
Sat
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Sun
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Duration: 1:10, non-stop
Boeing 737-800 (73H)
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3940
Effective 2026-06-09 through 2026-07-29
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: 1:10, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3940
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: 1:05, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3940
Effective 2026-06-07 through 2026-08-02
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: 1:10, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3940
Effective 2026-06-04 through 2026-08-03
Mon
Tue
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Wed
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-
Thu
Fri
Sat
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Sun
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-
Duration: 1:05, non-stop
Boeing 737-800 (73H)
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3940
Effective 2026-03-07 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 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3940
Valid until 2026-01-03
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: 2:30, non-stop
Boeing 737-800 (73H)
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3940
Effective 2026-06-07 through 2026-08-02
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: 2:05, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3940
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: 2:45, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3940
Effective 2026-01-11 through 2026-01-16
Mon
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Tue
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Wed
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Thu
Fri
Sat
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Sun
Duration: 2:50, non-stop
Boeing 737-800 (73H)
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3940
Effective 2026-01-19 through 2026-01-25
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
Duration: 2:50, non-stop
Boeing 737-800 (73H)
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3940
Effective 2026-02-01 through 2026-02-06
Mon
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Tue
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Wed
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Thu
Fri
Sat
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-
Sun
Duration: 2:50, non-stop
Boeing 737-800 (73H)
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3940
Effective 2026-02-09 through 2026-02-15
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
Duration: 2:50, non-stop
Boeing 737-800 (73H)
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3940
Effective 2026-02-17 through 2026-02-23
Mon
Tue
Wed
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Thu
Fri
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Sat
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Sun
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Duration: 2:50, non-stop
Boeing 737-800 (73H)
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3940
Operates only on 2026-03-02
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: 2:50, non-stop
Boeing 737-800 (73H)
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3940
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: 1:20, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3940
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: 1:20, non-stop
Boeing 737 MAX 8 (7M8)
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3940
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: 1:20, non-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3940
Effective 2026-02-12 through 2026-02-16
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)
The flight arrives 1 day after departure.
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Direct Flights:
Southwest Airlines WN3940
Effective 2026-02-20 through 2026-03-01
Mon
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Tue
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Wed
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Thu
Fri
Sat
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Sun
Duration: 2:55, 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 WN3940
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: 4:30, 1-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Non-Direct Flights:
Southwest Airlines WN3940
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: 4:25, 1-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
Non-Direct Flights:
Southwest Airlines WN3940
Effective 2026-06-04 through 2026-08-03
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, 1-stop
Boeing 737-800 (73H)
Boeing 737-800 (73H)
Non-Direct Flights:
Southwest Airlines WN3940
Effective 2026-06-07 through 2026-08-02
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: 3:55, 1-stop
Boeing 737-700 (Scimitar Winglets)
Boeing 737-700 (Scimitar Winglets)
This flight number is listed as serving the following routes:
- Chicago Midway (MDW) - Denver (DEN)
- Chicago Midway (MDW) - Grand Rapids (GRR)
- Dallas Love Field (DAL) - Knoxville (TYS)
- Dallas Love Field (DAL) - Orlando (MCO)
- Dallas Love Field (DAL) - San Antonio (SAT)
- Grand Rapids (GRR) - Denver (DEN)
- Lubbock (LBB) - Dallas Love Field (DAL)
- Lubbock (LBB) - Knoxville (TYS)
- Lubbock (LBB) - San Antonio (SAT)
- Pittsburgh (PIT) - Chicago Midway (MDW)
- Saint Louis (STL) - John Glenn Columbus (CMH)
- San Diego (SAN) - Austin (AUS)