Southwest Airlines flight WN 3721: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Sun 06:00 Love Field, Dallas (DAL) 1 07:30 Kansas City (MCI)
WN 3721 Non-stop Boeing 737-700 (Scimitar Winglets) 1:30 Effective 2025-10-05 through 2025-10-26
Fri 06:15 Phoenix Sky Harbor (PHX) 4 10:40 Love Field, Dallas (DAL) 1
WN 3721 Non-stop Boeing 737-700 (73W) 2:25 Operates only on 2025-07-04
Sat 06:25 Saint Louis (STL) 2 07:35 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737 MAX 8 (7M8) 1:10 Effective 2025-11-08 through 2025-11-15
Sat 06:25 Saint Louis (STL) 2 07:35 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737 MAX 8 (7M8) 1:10 Effective 2025-12-06 through 2025-12-13
Tue,Wed 07:00 Saint Louis (STL) 2 08:10 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737-800 (73H) 1:10 Effective 2025-11-04 through 2025-11-12
Mon-Thu 07:00 Saint Louis (STL) 2 08:10 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737-800 (73H) 1:10 Effective 2025-11-17 through 2025-11-20
Mon-Fri 07:00 Saint Louis (STL) 2 08:10 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737-800 (73H) 1:10 Effective 2025-12-02 through 2025-12-11
Mon-Wed 07:00 Saint Louis (STL) 2 08:10 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737-800 (73H) 1:10 Effective 2025-12-15 through 2025-12-17
Wed,Thu 07:00 Saint Louis (STL) 2 08:10 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737-800 (73H) 1:10 Effective 2025-12-24 through 2026-01-01
Mon,Thu,Fri,Sun 08:45 Saint Louis (STL) 2 09:55 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737-800 (73H) 1:10 Effective 2025-11-02 through 2025-11-16
Mon,Fri,Sun 08:45 Saint Louis (STL) 2 09:55 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737-800 (73H) 1:10 Effective 2025-11-21 through 2025-11-28
Fri,Sun 08:45 Saint Louis (STL) 2 09:55 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737-800 (73H) 1:10 Effective 2025-12-07 through 2025-12-14
Thu 08:45 Saint Louis (STL) 2 09:55 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737-800 (73H) 1:10 Operates only on 2025-12-18
Mon 08:45 Saint Louis (STL) 2 09:55 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737-800 (73H) 1:10 Operates only on 2026-01-05
Mon-Wed 08:55 Saint Louis (STL) 2 10:05 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737 MAX 8 (7M8) 1:10 Effective 2025-11-25 through 2025-12-01
Mon,Tue,Fri,Sun 08:55 Saint Louis (STL) 2 10:05 Midway, Chicago (MDW)
WN 3721 Non-stop Boeing 737 MAX 8 (7M8) 1:10 Effective 2025-12-19 through 2026-01-04
Mon-Wed 10:45 Midway, Chicago (MDW) 14:00 Jacksonville (JAX)
WN 3721 Non-stop Boeing 737 MAX 8 (7M8) 2:15 Effective 2025-11-25 through 2025-12-01
Mon,Tue,Fri,Sun 10:45 Midway, Chicago (MDW) 14:00 Jacksonville (JAX)
WN 3721 Non-stop Boeing 737 MAX 8 (7M8) 2:15 Effective 2025-12-19 through 2026-01-04
Tue,Wed 11:45 Midway, Chicago (MDW) 14:50 Manchester (MHT)
WN 3721 Non-stop Boeing 737-700 (73W) 2:05 Effective 2025-08-05 through 2025-10-01
Sun 12:15 Denver (DEN) 14:50 Kansas City (MCI)
WN 3721 Non-stop Boeing 737 MAX 8 (7M8) 1:35 Operates only on 2025-05-25
Mon-Fri 13:00 Denver (DEN) 15:35 Kansas City (MCI)
WN 3721 Non-stop Boeing 737-800 (73H) 1:35 Valid until 2025-06-04
Sun 13:25 Denver (DEN) 16:05 Kansas City (MCI)
WN 3721 Non-stop Boeing 737-800 (73H) 1:40 Valid until 2025-05-18
Sun 13:25 Denver (DEN) 16:05 Kansas City (MCI)
WN 3721 Non-stop Boeing 737-800 (73H) 1:40 Operates only on 2025-06-01
Sat 14:40 Denver (DEN) 17:15 Kansas City (MCI)
WN 3721 Non-stop Boeing 737 MAX 8 (7M8) 1:35 Valid until 2025-05-31
Sat 17:40 Midway, Chicago (MDW) 20:50 Manchester (MHT)
WN 3721 Non-stop Boeing 737-800 (73H) 2:10 Effective 2025-08-09 through 2025-09-27
Sun 19:05 Austin (AUS) 19:55 Las Vegas Harry Reid (LAS) 1
WN 3721 Non-stop Boeing 737-700 (73W) 2:50 Effective 2025-08-10 through 2025-08-24
Sun 19:05 Austin (AUS) 19:55 Las Vegas Harry Reid (LAS) 1
WN 3721 Non-stop Boeing 737-700 (73W) 2:50 Effective 2025-09-07 through 2025-09-28
Mon,Thu,Fri 19:20 Midway, Chicago (MDW) 22:30 Manchester (MHT)
WN 3721 Non-stop Boeing 737-700 (73W) 2:10 Effective 2025-08-07 through 2025-09-29
Sun 19:35 Austin (AUS) 20:30 Las Vegas Harry Reid (LAS) 1
WN 3721 Non-stop Boeing 737-800 (73H) 2:55 Operates only on 2025-08-31
Sun 20:35 Las Vegas Harry Reid (LAS) 1 22:00 Reno (RNO)
WN 3721 Non-stop Boeing 737-700 (73W) 1:25 Effective 2025-08-10 through 2025-08-24
Sun 20:35 Las Vegas Harry Reid (LAS) 1 22:00 Reno (RNO)
WN 3721 Non-stop Boeing 737-700 (73W) 1:25 Effective 2025-09-07 through 2025-09-28
Non-Direct Flights:
Mon-Wed 08:55 Saint Louis (STL) 2 14:00 Jacksonville (JAX)
WN 3721 1-stop Boeing 737 MAX 8 (7M8) 4:05 Effective 2025-11-25 through 2025-12-01
Mon,Tue,Fri,Sun 08:55 Saint Louis (STL) 2 14:00 Jacksonville (JAX)
WN 3721 1-stop Boeing 737 MAX 8 (7M8) 4:05 Effective 2025-12-19 through 2026-01-04
Sun 19:05 Austin (AUS) 22:00 Reno (RNO)
WN 3721 1-stop Boeing 737-700 (73W) 4:55 Effective 2025-08-10 through 2025-08-24
Sun 19:05 Austin (AUS) 22:00 Reno (RNO)
WN 3721 1-stop Boeing 737-700 (73W) 4:55 Effective 2025-09-07 through 2025-09-28
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This flight number is listed as serving the following routes:


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Southwest Airlines flight WN 3721: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Southwest Airlines WN3721
06:00
Love Field, Dallas (DAL) 1

07:30
Kansas City (MCI)
Effective 2025-10-05 through 2025-10-26
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:30, non-stop
Boeing 737-700 (Scimitar Winglets)
Southwest Airlines WN3721
06:15
Phoenix Sky Harbor (PHX) 4

10:40
Love Field, Dallas (DAL) 1
Operates only on 2025-07-04
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Duration: 2:25, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3721
06:25
Saint Louis (STL) 2

07:35
Midway, Chicago (MDW)
Effective 2025-11-08 through 2025-11-15
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:10, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3721
06:25
Saint Louis (STL) 2

07:35
Midway, Chicago (MDW)
Effective 2025-12-06 through 2025-12-13
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:10, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3721
07:00
Saint Louis (STL) 2

08:10
Midway, Chicago (MDW)
Effective 2025-11-04 through 2025-11-12
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
07:00
Saint Louis (STL) 2

08:10
Midway, Chicago (MDW)
Effective 2025-11-17 through 2025-11-20
Mon
Tue
Wed
Thu
Fri
-
Sat
-
Sun
-
Duration: 1:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
07:00
Saint Louis (STL) 2

08:10
Midway, Chicago (MDW)
Effective 2025-12-02 through 2025-12-11
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 1:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
07:00
Saint Louis (STL) 2

08:10
Midway, Chicago (MDW)
Effective 2025-12-15 through 2025-12-17
Mon
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
07:00
Saint Louis (STL) 2

08:10
Midway, Chicago (MDW)
Effective 2025-12-24 through 2026-01-01
Mon
-
Tue
-
Wed
Thu
Fri
-
Sat
-
Sun
-
Duration: 1:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
08:45
Saint Louis (STL) 2

09:55
Midway, Chicago (MDW)
Effective 2025-11-02 through 2025-11-16
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 1:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
08:45
Saint Louis (STL) 2

09:55
Midway, Chicago (MDW)
Effective 2025-11-21 through 2025-11-28
Mon
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 1:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
08:45
Saint Louis (STL) 2

09:55
Midway, Chicago (MDW)
Effective 2025-12-07 through 2025-12-14
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 1:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
08:45
Saint Louis (STL) 2

09:55
Midway, Chicago (MDW)
Operates only on 2025-12-18
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 1:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
08:45
Saint Louis (STL) 2

09:55
Midway, Chicago (MDW)
Operates only on 2026-01-05
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
08:55
Saint Louis (STL) 2

10:05
Midway, Chicago (MDW)
Effective 2025-11-25 through 2025-12-01
Mon
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:10, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3721
08:55
Saint Louis (STL) 2

10:05
Midway, Chicago (MDW)
Effective 2025-12-19 through 2026-01-04
Mon
Tue
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 1:10, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3721
10:45
Midway, Chicago (MDW)

14:00
Jacksonville (JAX)
Effective 2025-11-25 through 2025-12-01
Mon
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:15, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3721
10:45
Midway, Chicago (MDW)

14:00
Jacksonville (JAX)
Effective 2025-12-19 through 2026-01-04
Mon
Tue
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 2:15, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3721
11:45
Midway, Chicago (MDW)

14:50
Manchester (MHT)
Effective 2025-08-05 through 2025-10-01
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:05, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3721
12:15
Denver (DEN)

14:50
Kansas City (MCI)
Operates only on 2025-05-25
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:35, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3721
13:00
Denver (DEN)

15:35
Kansas City (MCI)
Valid until 2025-06-04
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 1:35, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
13:25
Denver (DEN)

16:05
Kansas City (MCI)
Valid until 2025-05-18
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:40, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
13:25
Denver (DEN)

16:05
Kansas City (MCI)
Operates only on 2025-06-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:40, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
14:40
Denver (DEN)

17:15
Kansas City (MCI)
Valid until 2025-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:35, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3721
17:40
Midway, Chicago (MDW)

20:50
Manchester (MHT)
Effective 2025-08-09 through 2025-09-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
19:05
Austin (AUS)

19:55
Las Vegas Harry Reid (LAS) 1
Effective 2025-08-10 through 2025-08-24
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:50, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3721
19:05
Austin (AUS)

19:55
Las Vegas Harry Reid (LAS) 1
Effective 2025-09-07 through 2025-09-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:50, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3721
19:20
Midway, Chicago (MDW)

22:30
Manchester (MHT)
Effective 2025-08-07 through 2025-09-29
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 2:10, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3721
19:35
Austin (AUS)

20:30
Las Vegas Harry Reid (LAS) 1
Operates only on 2025-08-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:55, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3721
20:35
Las Vegas Harry Reid (LAS) 1

22:00
Reno (RNO)
Effective 2025-08-10 through 2025-08-24
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:25, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3721
20:35
Las Vegas Harry Reid (LAS) 1

22:00
Reno (RNO)
Effective 2025-09-07 through 2025-09-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:25, non-stop
Boeing 737-700 (73W)
Non-Direct Flights:
Southwest Airlines WN3721
08:55
Saint Louis (STL) 2

14:00
Jacksonville (JAX)
Effective 2025-11-25 through 2025-12-01
Mon
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 4:05, 1-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3721
08:55
Saint Louis (STL) 2

14:00
Jacksonville (JAX)
Effective 2025-12-19 through 2026-01-04
Mon
Tue
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 4:05, 1-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3721
19:05
Austin (AUS)

22:00
Reno (RNO)
Effective 2025-08-10 through 2025-08-24
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 4:55, 1-stop
Boeing 737-700 (73W)
Southwest Airlines WN3721
19:05
Austin (AUS)

22:00
Reno (RNO)
Effective 2025-09-07 through 2025-09-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 4:55, 1-stop
Boeing 737-700 (73W)
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This flight number is listed as serving the following routes:
  • Austin (AUS) - Las Vegas Harry Reid (LAS)
  • Austin (AUS) - Reno (RNO)
  • Denver (DEN) - Kansas City (MCI)
  • Las Vegas Harry Reid (LAS) - Reno (RNO)
  • Love Field, Dallas (DAL) - Kansas City (MCI)
  • Midway, Chicago (MDW) - Jacksonville (JAX)
  • Midway, Chicago (MDW) - Manchester (MHT)
  • Phoenix Sky Harbor (PHX) - Love Field, Dallas (DAL)
  • Saint Louis (STL) - Jacksonville (JAX)
  • Saint Louis (STL) - Midway, Chicago (MDW)
All Southwest Airlines flights
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