Southwest Airlines flight WN 4121: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Mon,Thu,Fri 06:30 Detroit (DTW) E 06:35 Midway, Chicago (MDW)
WN 4121 Non-stop Boeing 737-700 (73W) 1:05 Effective 2025-08-07 through 2025-09-29
Sun 07:05 Detroit (DTW) E 07:15 Midway, Chicago (MDW)
WN 4121 Non-stop Boeing 737-700 (73W) 1:10 Effective 2025-08-10 through 2025-08-24
Sun 07:05 Detroit (DTW) E 07:15 Midway, Chicago (MDW)
WN 4121 Non-stop Boeing 737-700 (73W) 1:10 Effective 2025-09-07 through 2025-09-28
Tue,Wed 07:10 Detroit (DTW) E 07:20 Midway, Chicago (MDW)
WN 4121 Non-stop Boeing 737-800 (73H) 1:10 Effective 2025-08-05 through 2025-10-01
Sat 07:10 Detroit (DTW) E 07:20 Midway, Chicago (MDW)
WN 4121 Non-stop Boeing 737-700 (73W) 1:10 Effective 2025-08-09 through 2025-09-27
Sun 07:35 Detroit (DTW) E 07:45 Midway, Chicago (MDW)
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 1:10 Operates only on 2025-08-31
Sun 12:10 Portland (PDX) 15:35 Denver (DEN)
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:25 Effective 2025-10-05 through 2025-10-26
Sat 13:15 Portland (PDX) 16:40 Denver (DEN)
WN 4121 Non-stop Boeing 737-800 (73H) 2:25 Effective 2025-10-04 through 2025-11-01
Mon,Thu,Fri 13:25 Portland (PDX) 16:50 Denver (DEN)
WN 4121 Non-stop Boeing 737-800 (73H) 2:25 Effective 2025-10-02 through 2025-10-31
Sat 16:55 Seattle-Tacoma (SEA) 20:40 Phoenix Sky Harbor (PHX) 4
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:45 Effective 2025-11-22 through 2025-11-29
Sat 16:55 Seattle-Tacoma (SEA) 20:40 Phoenix Sky Harbor (PHX) 4
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:45 Effective 2025-12-20 through 2026-01-03
Tue,Wed 17:55 Las Vegas Harry Reid (LAS) 1 23:05 Minneapolis/Saint Paul (MSP) 2
WN 4121 Non-stop Boeing 737-800 (73H) 3:10 Valid until 2025-06-04
Sat 18:15 Las Vegas Harry Reid (LAS) 1 23:25 Minneapolis/Saint Paul (MSP) 2
WN 4121 Non-stop Boeing 737-800 (73H) 3:10 Valid until 2025-05-31
Tue,Wed 18:30 Portland (PDX) 21:55 Denver (DEN)
WN 4121 Non-stop Boeing 737-800 (73H) 2:25 Effective 2025-10-07 through 2025-10-29
Tue,Wed 18:40 Phoenix Sky Harbor (PHX) 4 21:45 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 2:05 Effective 2025-11-04 through 2025-11-12
Mon-Thu 18:40 Phoenix Sky Harbor (PHX) 4 21:45 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 2:05 Effective 2025-11-17 through 2025-11-20
Mon-Fri 18:40 Phoenix Sky Harbor (PHX) 4 21:45 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 2:05 Effective 2025-12-02 through 2025-12-11
Mon-Wed 18:40 Phoenix Sky Harbor (PHX) 4 21:45 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 2:05 Effective 2025-12-15 through 2025-12-17
Wed,Thu 18:40 Phoenix Sky Harbor (PHX) 4 21:45 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 2:05 Effective 2025-12-24 through 2026-01-01
Mon,Thu,Fri 18:50 Las Vegas Harry Reid (LAS) 1 23:55 Minneapolis/Saint Paul (MSP) 2
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 3:05 Valid until 2025-06-02
Mon,Thu,Fri,Sun 19:55 Phoenix Sky Harbor (PHX) 4 23:00 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:05 Effective 2025-11-02 through 2025-11-16
Mon,Fri,Sun 19:55 Phoenix Sky Harbor (PHX) 4 23:00 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:05 Effective 2025-11-21 through 2025-11-28
Fri,Sun 19:55 Phoenix Sky Harbor (PHX) 4 23:00 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:05 Effective 2025-12-07 through 2025-12-14
Thu 19:55 Phoenix Sky Harbor (PHX) 4 23:00 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:05 Operates only on 2025-12-18
Mon 19:55 Phoenix Sky Harbor (PHX) 4 23:00 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:05 Operates only on 2026-01-05
Sat 20:00 San Antonio (SAT) A 20:50 Las Vegas Harry Reid (LAS) 1
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:50 Effective 2025-06-07 through 2025-08-02
Mon-Wed 21:05 Phoenix Sky Harbor (PHX) 4 00:10 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 2:05 Effective 2025-11-25 through 2025-12-01
The flight arrives 1 day after departure.
Mon,Tue,Fri,Sun 21:05 Phoenix Sky Harbor (PHX) 4 00:10 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 2:05 Effective 2025-12-19 through 2026-01-04
The flight arrives 1 day after departure.
Sat 21:20 Phoenix Sky Harbor (PHX) 4 00:25 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:05 Effective 2025-11-22 through 2025-11-29
The flight arrives 1 day after departure.
Sat 21:20 Phoenix Sky Harbor (PHX) 4 00:25 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:05 Effective 2025-12-20 through 2026-01-03
The flight arrives 1 day after departure.
Sun 21:45 Phoenix Sky Harbor (PHX) 4 00:50 San Antonio (SAT) A
WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:05 Operates only on 2025-11-30
The flight arrives 1 day after departure.
Non-Direct Flights:
Sat 16:55 Seattle-Tacoma (SEA) 00:25 San Antonio (SAT) A
WN 4121 1-stop Boeing 737 MAX 8 (7M8) 5:30 Effective 2025-11-22 through 2025-11-29
The flight arrives 1 day after departure.
Sat 16:55 Seattle-Tacoma (SEA) 00:25 San Antonio (SAT) A
WN 4121 1-stop Boeing 737 MAX 8 (7M8) 5:30 Effective 2025-12-20 through 2026-01-03
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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Southwest Airlines flight WN 4121: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Southwest Airlines WN4121
06:30
Detroit (DTW) E

06:35
Midway, Chicago (MDW)
Effective 2025-08-07 through 2025-09-29
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 1:05, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN4121
07:05
Detroit (DTW) E

07:15
Midway, Chicago (MDW)
Effective 2025-08-10 through 2025-08-24
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:10, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN4121
07:05
Detroit (DTW) E

07:15
Midway, Chicago (MDW)
Effective 2025-09-07 through 2025-09-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:10, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN4121
07:10
Detroit (DTW) E

07:20
Midway, Chicago (MDW)
Effective 2025-08-05 through 2025-10-01
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN4121
07:10
Detroit (DTW) E

07:20
Midway, Chicago (MDW)
Effective 2025-08-09 through 2025-09-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:10, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN4121
07:35
Detroit (DTW) E

07:45
Midway, Chicago (MDW)
Operates only on 2025-08-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:10, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN4121
12:10
Portland (PDX)

15:35
Denver (DEN)
Effective 2025-10-05 through 2025-10-26
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:25, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN4121
13:15
Portland (PDX)

16:40
Denver (DEN)
Effective 2025-10-04 through 2025-11-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:25, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN4121
13:25
Portland (PDX)

16:50
Denver (DEN)
Effective 2025-10-02 through 2025-10-31
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 2:25, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN4121
16:55
Seattle-Tacoma (SEA)

20:40
Phoenix Sky Harbor (PHX) 4
Effective 2025-11-22 through 2025-11-29
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:45, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN4121
16:55
Seattle-Tacoma (SEA)

20:40
Phoenix Sky Harbor (PHX) 4
Effective 2025-12-20 through 2026-01-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:45, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN4121
17:55
Las Vegas Harry Reid (LAS) 1

23:05
Minneapolis/Saint Paul (MSP) 2
Valid until 2025-06-04
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 3:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN4121
18:15
Las Vegas Harry Reid (LAS) 1

23:25
Minneapolis/Saint Paul (MSP) 2
Valid until 2025-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 3:10, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN4121
18:30
Portland (PDX)

21:55
Denver (DEN)
Effective 2025-10-07 through 2025-10-29
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:25, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN4121
18:40
Phoenix Sky Harbor (PHX) 4

21:45
San Antonio (SAT) A
Effective 2025-11-04 through 2025-11-12
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:05, non-stop
Boeing 737-700 (Scimitar Winglets)
Southwest Airlines WN4121
18:40
Phoenix Sky Harbor (PHX) 4

21:45
San Antonio (SAT) A
Effective 2025-11-17 through 2025-11-20
Mon
Tue
Wed
Thu
Fri
-
Sat
-
Sun
-
Duration: 2:05, non-stop
Boeing 737-700 (Scimitar Winglets)
Southwest Airlines WN4121
18:40
Phoenix Sky Harbor (PHX) 4

21:45
San Antonio (SAT) A
Effective 2025-12-02 through 2025-12-11
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
-
Duration: 2:05, non-stop
Boeing 737-700 (Scimitar Winglets)
Southwest Airlines WN4121
18:40
Phoenix Sky Harbor (PHX) 4

21:45
San Antonio (SAT) A
Effective 2025-12-15 through 2025-12-17
Mon
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:05, non-stop
Boeing 737-700 (Scimitar Winglets)
Southwest Airlines WN4121
18:40
Phoenix Sky Harbor (PHX) 4

21:45
San Antonio (SAT) A
Effective 2025-12-24 through 2026-01-01
Mon
-
Tue
-
Wed
Thu
Fri
-
Sat
-
Sun
-
Duration: 2:05, non-stop
Boeing 737-700 (Scimitar Winglets)
Southwest Airlines WN4121
18:50
Las Vegas Harry Reid (LAS) 1

23:55
Minneapolis/Saint Paul (MSP) 2
Valid until 2025-06-02
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 3:05, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN4121
19:55
Phoenix Sky Harbor (PHX) 4

23:00
San Antonio (SAT) A
Effective 2025-11-02 through 2025-11-16
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 2:05, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN4121
19:55
Phoenix Sky Harbor (PHX) 4

23:00
San Antonio (SAT) A
Effective 2025-11-21 through 2025-11-28
Mon
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 2:05, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN4121
19:55
Phoenix Sky Harbor (PHX) 4

23:00
San Antonio (SAT) A
Effective 2025-12-07 through 2025-12-14
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 2:05, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN4121
19:55
Phoenix Sky Harbor (PHX) 4

23:00
San Antonio (SAT) A
Operates only on 2025-12-18
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 2:05, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN4121
19:55
Phoenix Sky Harbor (PHX) 4

23:00
San Antonio (SAT) A
Operates only on 2026-01-05
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:05, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN4121
20:00
San Antonio (SAT) A

20:50
Las Vegas Harry Reid (LAS) 1
Effective 2025-06-07 through 2025-08-02
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:50, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN4121
21:05
Phoenix Sky Harbor (PHX) 4

00:10(+1)
San Antonio (SAT) A
Effective 2025-11-25 through 2025-12-01
Mon
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:05, non-stop
Boeing 737-700 (Scimitar Winglets)
The flight arrives 1 day after departure.
Southwest Airlines WN4121
21:05
Phoenix Sky Harbor (PHX) 4

00:10(+1)
San Antonio (SAT) A
Effective 2025-12-19 through 2026-01-04
Mon
Tue
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 2:05, non-stop
Boeing 737-700 (Scimitar Winglets)
The flight arrives 1 day after departure.
Southwest Airlines WN4121
21:20
Phoenix Sky Harbor (PHX) 4

00:25(+1)
San Antonio (SAT) A
Effective 2025-11-22 through 2025-11-29
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:05, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Southwest Airlines WN4121
21:20
Phoenix Sky Harbor (PHX) 4

00:25(+1)
San Antonio (SAT) A
Effective 2025-12-20 through 2026-01-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:05, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Southwest Airlines WN4121
21:45
Phoenix Sky Harbor (PHX) 4

00:50(+1)
San Antonio (SAT) A
Operates only on 2025-11-30
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:05, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Non-Direct Flights:
Southwest Airlines WN4121
16:55
Seattle-Tacoma (SEA)

00:25(+1)
San Antonio (SAT) A
Effective 2025-11-22 through 2025-11-29
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 5:30, 1-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Southwest Airlines WN4121
16:55
Seattle-Tacoma (SEA)

00:25(+1)
San Antonio (SAT) A
Effective 2025-12-20 through 2026-01-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 5:30, 1-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
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This flight number is listed as serving the following routes:
  • Detroit (DTW) - Midway, Chicago (MDW)
  • Las Vegas Harry Reid (LAS) - Minneapolis/Saint Paul (MSP)
  • Phoenix Sky Harbor (PHX) - San Antonio (SAT)
  • Portland (PDX) - Denver (DEN)
  • San Antonio (SAT) - Las Vegas Harry Reid (LAS)
  • Seattle-Tacoma (SEA) - Phoenix Sky Harbor (PHX)
  • Seattle-Tacoma (SEA) - San Antonio (SAT)
All Southwest Airlines flights
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