Southwest Airlines flight WN 4321: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Mon,Thu,Fri 08:20 Baltimore (BWI) 11:15 Miami (MIA)
WN 4321 Non-stop Boeing 737 MAX 8 (7M8) 2:55 Effective 2026-02-12 through 2026-02-16
Sat 08:20 Baltimore (BWI) 11:15 Miami (MIA)
WN 4321 Non-stop Boeing 737-800 (73H) 2:55 Effective 2026-02-14 through 2026-02-28
Thu,Fri,Sun 08:20 Baltimore (BWI) 11:15 Miami (MIA)
WN 4321 Non-stop Boeing 737 MAX 8 (7M8) 2:55 Effective 2026-02-20 through 2026-03-01
Wed,Thu 08:55 Sacramento (SMF) B 10:15 Burbank (BUR)
WN 4321 Non-stop Boeing 737-700 (73W) 1:20 Valid until 2026-01-01
Mon 09:05 Sacramento (SMF) B 10:25 Burbank (BUR)
WN 4321 Non-stop Boeing 737-700 (Scimitar Winglets) 1:20 Operates only on 2026-01-05
Sun 10:45 Greenville/Spartanburg (GSP) 11:00 Nashville (BNA)
WN 4321 Non-stop Boeing 737-700 (Scimitar Winglets) 1:15 Effective 2026-08-09 through 2026-09-27
Fri,Sun 11:45 Santa Ana (SNA) 17:35 Nashville (BNA)
WN 4321 Non-stop Boeing 737-700 (Scimitar Winglets) 3:50 Effective 2026-01-02 through 2026-01-04
Sat 11:55 Miami (MIA) 14:20 Austin (AUS)
WN 4321 Non-stop Boeing 737-800 (73H) 3:25 Effective 2026-02-14 through 2026-02-28
Mon,Thu,Fri 13:05 Norfolk (ORF) 14:10 Baltimore (BWI)
WN 4321 Non-stop Boeing 737-700 (Scimitar Winglets) 1:05 Effective 2026-08-06 through 2026-09-28
Tue,Wed 15:20 Norfolk (ORF) 16:20 Baltimore (BWI)
WN 4321 Non-stop Boeing 737-700 (Scimitar Winglets) 1:00 Effective 2026-08-04 through 2026-09-30
Sat 15:35 Norfolk (ORF) 16:35 Baltimore (BWI)
WN 4321 Non-stop Boeing 737-700 (Scimitar Winglets) 1:00 Effective 2026-08-08 through 2026-09-26
Sat 19:10 Fort Lauderdale (FLL) 1 21:50 Las Vegas Harry Reid (LAS) 1
WN 4321 Non-stop Boeing 737 MAX 8 (7M8) 5:40 Effective 2026-03-07 through 2026-04-04
Tue,Wed 21:20 Baltimore (BWI) 22:35 Islip (ISP)
WN 4321 Non-stop Boeing 737-700 (Scimitar Winglets) 1:15 Effective 2026-06-09 through 2026-07-29
Sat 21:50 Fort Lauderdale (FLL) 1 23:55 Chicago Midway (MDW)
WN 4321 Non-stop Boeing 737 MAX 8 (7M8) 3:05 Valid until 2026-01-03
Sat 22:00 Baltimore (BWI) 23:10 Islip (ISP)
WN 4321 Non-stop Boeing 737 MAX 8 (7M8) 1:10 Effective 2026-06-06 through 2026-08-01
Mon,Thu,Fri,Sun 22:25 Baltimore (BWI) 23:35 Islip (ISP)
WN 4321 Non-stop Boeing 737-700 (Scimitar Winglets) 1:10 Effective 2026-06-04 through 2026-08-03
Non-Direct Flights:
Sat 08:20 Baltimore (BWI) 14:20 Austin (AUS)
WN 4321 1-stop Boeing 737-800 (73H) 7:00 Effective 2026-02-14 through 2026-02-28
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This flight number is listed as serving the following routes:


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Southwest Airlines flight WN 4321: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Southwest Airlines WN4321
08:20
Baltimore (BWI)

11:15
Miami (MIA)
Effective 2026-02-12 through 2026-02-16
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 2:55, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN4321
08:20
Baltimore (BWI)

11:15
Miami (MIA)
Effective 2026-02-14 through 2026-02-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:55, non-stop
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN4321
08:20
Baltimore (BWI)

11:15
Miami (MIA)
Effective 2026-02-20 through 2026-03-01
Mon
-
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 2:55, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN4321
08:55
Sacramento (SMF) B

10:15
Burbank (BUR)
Valid until 2026-01-01
Mon
-
Tue
-
Wed
Thu
Fri
-
Sat
-
Sun
-
Duration: 1:20, non-stop
Boeing 737-700 (73W)
Direct Flights:
Southwest Airlines WN4321
09:05
Sacramento (SMF) B

10:25
Burbank (BUR)
Operates only on 2026-01-05
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:20, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN4321
10:45
Greenville/Spartanburg (GSP)

11:00
Nashville (BNA)
Effective 2026-08-09 through 2026-09-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:15, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN4321
11:45
Santa Ana (SNA)

17:35
Nashville (BNA)
Effective 2026-01-02 through 2026-01-04
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 3:50, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN4321
11:55
Miami (MIA)

14:20
Austin (AUS)
Effective 2026-02-14 through 2026-02-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 3:25, non-stop
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN4321
13:05
Norfolk (ORF)

14:10
Baltimore (BWI)
Effective 2026-08-06 through 2026-09-28
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 1:05, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN4321
15:20
Norfolk (ORF)

16:20
Baltimore (BWI)
Effective 2026-08-04 through 2026-09-30
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:00, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN4321
15:35
Norfolk (ORF)

16:35
Baltimore (BWI)
Effective 2026-08-08 through 2026-09-26
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:00, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN4321
19:10
Fort Lauderdale (FLL) 1

21:50
Las Vegas Harry Reid (LAS) 1
Effective 2026-03-07 through 2026-04-04
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 5:40, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN4321
21:20
Baltimore (BWI)

22:35
Islip (ISP)
Effective 2026-06-09 through 2026-07-29
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:15, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN4321
21:50
Fort Lauderdale (FLL) 1

23:55
Chicago Midway (MDW)
Valid until 2026-01-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 3:05, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN4321
22:00
Baltimore (BWI)

23:10
Islip (ISP)
Effective 2026-06-06 through 2026-08-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:10, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN4321
22:25
Baltimore (BWI)

23:35
Islip (ISP)
Effective 2026-06-04 through 2026-08-03
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 1:10, non-stop
Boeing 737-700 (Scimitar Winglets)
Non-Direct Flights:
Southwest Airlines WN4321
08:20
Baltimore (BWI)

14:20
Austin (AUS)
Effective 2026-02-14 through 2026-02-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 7:00, 1-stop
Boeing 737-800 (73H)
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Parallax here
This flight number is listed as serving the following routes:
  • Baltimore (BWI) - Austin (AUS)
  • Baltimore (BWI) - Islip (ISP)
  • Baltimore (BWI) - Miami (MIA)
  • Fort Lauderdale (FLL) - Chicago Midway (MDW)
  • Fort Lauderdale (FLL) - Las Vegas Harry Reid (LAS)
  • Greenville/Spartanburg (GSP) - Nashville (BNA)
  • Miami (MIA) - Austin (AUS)
  • Norfolk (ORF) - Baltimore (BWI)
  • Sacramento (SMF) - Burbank (BUR)
  • Santa Ana (SNA) - Nashville (BNA)
All Southwest Airlines flights
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