Southwest Airlines flight WN 4121: Multiple routes

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FLIGHT SCHEDULE
Direct Flights:
Tue,Wed 13:15 Phoenix Sky Harbor (PHX) 4 15:50 Salt Lake City (SLC) WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 1:35 Effective 2026-08-04 through 2026-09-30
Sat 15:40 Phoenix Sky Harbor (PHX) 4 18:15 Salt Lake City (SLC) WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 1:35 Effective 2026-08-08 through 2026-09-26
Sat 16:40 Tampa (TPA) 19:15 San Diego (SAN) 1 WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 5:35 Effective 2026-02-14 through 2026-02-28
Sat 16:55 Seattle-Tacoma (SEA) 20:40 Phoenix Sky Harbor (PHX) 4 WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 2:45 Valid until 2026-01-03
Mon,Thu,Fri 17:40 Tampa (TPA) 20:10 San Diego (SAN) 1 WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 5:30 Effective 2026-02-12 through 2026-02-16
Thu,Fri,Sun 17:40 Tampa (TPA) 20:10 San Diego (SAN) 1 WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 5:30 Effective 2026-02-20 through 2026-03-01
Wed,Thu 18:40 Phoenix Sky Harbor (PHX) 4 21:45 San Antonio (SAT) A WN 4121 Non-stop Boeing 737-700 (73W) 2:05 Valid until 2026-01-01
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 20:35 Chicago Midway (MDW) 23:00 Sacramento (SMF) B WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 4:25 Effective 2026-06-06 through 2026-08-01
Thu,Fri,Sun 20:45 San Diego (SAN) 1 22:25 Oakland (OAK) 2 WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 1:40 Effective 2026-01-11 through 2026-01-16
Mon,Sun 20:45 San Diego (SAN) 1 22:25 Oakland (OAK) 2 WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 1:40 Effective 2026-01-19 through 2026-01-25
Thu,Fri,Sun 20:45 San Diego (SAN) 1 22:25 Oakland (OAK) 2 WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 1:40 Effective 2026-02-01 through 2026-02-06
Mon,Sun 20:45 San Diego (SAN) 1 22:25 Oakland (OAK) 2 WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 1:40 Effective 2026-02-09 through 2026-02-15
Mon,Tue,Thu 20:45 San Diego (SAN) 1 22:25 Oakland (OAK) 2 WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 1:40 Effective 2026-02-17 through 2026-02-23
Mon 20:45 San Diego (SAN) 1 22:25 Oakland (OAK) 2 WN 4121 Non-stop Boeing 737-700 (Scimitar Winglets) 1:40 Operates only on 2026-03-02
Mon,Thu,Fri 20:45 Phoenix Sky Harbor (PHX) 4 23:20 Salt Lake City (SLC) WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 1:35 Effective 2026-08-06 through 2026-09-28
Mon,Thu,Fri 20:55 San Diego (SAN) 1 22:40 Oakland (OAK) 2 WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 1:45 Effective 2026-02-12 through 2026-02-16
Thu,Fri,Sun 20:55 San Diego (SAN) 1 22:40 Oakland (OAK) 2 WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 1:45 Effective 2026-02-20 through 2026-03-01
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 2026-01-02 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 Valid until 2026-01-03 The flight arrives 1 day after departure.
Tue,Wed,Sun 21:50 Chicago Midway (MDW) 00:15 Sacramento (SMF) B WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 4:25 Effective 2026-06-07 through 2026-08-02 The flight arrives 1 day after departure.
Mon,Thu,Fri 21:55 Chicago Midway (MDW) 00:20 Sacramento (SMF) B WN 4121 Non-stop Boeing 737 MAX 8 (7M8) 4:25 Effective 2026-06-04 through 2026-08-03 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 Valid until 2026-01-03 The flight arrives 1 day after departure.
Mon,Thu,Fri 17:40 Tampa (TPA) 22:40 Oakland (OAK) 2 WN 4121 1-stop Boeing 737 MAX 8 (7M8) 8:00 Effective 2026-02-12 through 2026-02-16
Thu,Fri,Sun 17:40 Tampa (TPA) 22:40 Oakland (OAK) 2 WN 4121 1-stop Boeing 737 MAX 8 (7M8) 8:00 Effective 2026-02-20 through 2026-03-01

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Parallax here

This flight number is listed as serving the following routes:

Chicago Midway (MDW) - Sacramento (SMF)
Phoenix Sky Harbor (PHX) - Salt Lake City (SLC)
Phoenix Sky Harbor (PHX) - San Antonio (SAT)
San Diego (SAN) - Oakland (OAK)
Seattle-Tacoma (SEA) - Phoenix Sky Harbor (PHX)
Seattle-Tacoma (SEA) - San Antonio (SAT)
Tampa (TPA) - Oakland (OAK)
Tampa (TPA) - San Diego (SAN)

All Southwest Airlines flights

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Southwest Airlines flight WN 4121: Multiple routes

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FLIGHT SCHEDULE

Direct Flights:

Southwest Airlines WN4121

13:15

Phoenix Sky Harbor (PHX) 4

15:50

Salt Lake City (SLC)

Effective 2026-08-04 through 2026-09-30

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 1:35, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN4121

15:40

Phoenix Sky Harbor (PHX) 4

18:15

Salt Lake City (SLC)

Effective 2026-08-08 through 2026-09-26

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 1:35, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4121

16:40

Tampa (TPA)

19:15

San Diego (SAN) 1

Effective 2026-02-14 through 2026-02-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 5:35, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4121

16:55

Seattle-Tacoma (SEA)

20:40

Phoenix Sky Harbor (PHX) 4

Valid until 2026-01-03

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:45, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4121

17:40

Tampa (TPA)

20:10

San Diego (SAN) 1

Effective 2026-02-12 through 2026-02-16

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 5:30, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4121

17:40

Tampa (TPA)

20:10

San Diego (SAN) 1

Effective 2026-02-20 through 2026-03-01

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 5:30, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4121

18:40

Phoenix Sky Harbor (PHX) 4

21:45

San Antonio (SAT) A

Valid until 2026-01-01

Mon
-

Tue
-

Wed

Thu

Fri
-

Sat
-

Sun
-

Duration: 2:05, non-stop
Boeing 737-700 (73W)

Direct Flights:

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)

Direct Flights:

Southwest Airlines WN4121

20:35

Chicago Midway (MDW)

23:00

Sacramento (SMF) B

Effective 2026-06-06 through 2026-08-01

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 4:25, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4121

20:45

San Diego (SAN) 1

22:25

Oakland (OAK) 2

Effective 2026-01-11 through 2026-01-16

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 1:40, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN4121

20:45

San Diego (SAN) 1

22:25

Oakland (OAK) 2

Effective 2026-01-19 through 2026-01-25

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 1:40, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN4121

20:45

San Diego (SAN) 1

22:25

Oakland (OAK) 2

Effective 2026-02-01 through 2026-02-06

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 1:40, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN4121

20:45

San Diego (SAN) 1

22:25

Oakland (OAK) 2

Effective 2026-02-09 through 2026-02-15

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 1:40, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN4121

20:45

San Diego (SAN) 1

22:25

Oakland (OAK) 2

Effective 2026-02-17 through 2026-02-23

Mon

Tue

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Duration: 1:40, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN4121

20:45

San Diego (SAN) 1

22:25

Oakland (OAK) 2

Operates only on 2026-03-02

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 1:40, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN4121

20:45

Phoenix Sky Harbor (PHX) 4

23:20

Salt Lake City (SLC)

Effective 2026-08-06 through 2026-09-28

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 1:35, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4121

20:55

San Diego (SAN) 1

22:40

Oakland (OAK) 2

Effective 2026-02-12 through 2026-02-16

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 1:45, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4121

20:55

San Diego (SAN) 1

22:40

Oakland (OAK) 2

Effective 2026-02-20 through 2026-03-01

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 1:45, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4121

21:05

Phoenix Sky Harbor (PHX) 4

00:10(+1)

San Antonio (SAT) A

Effective 2026-01-02 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.

Direct Flights:

Southwest Airlines WN4121

21:20

Phoenix Sky Harbor (PHX) 4

00:25(+1)

San Antonio (SAT) A

Valid until 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.

Direct Flights:

Southwest Airlines WN4121

21:50

Chicago Midway (MDW)

00:15(+1)

Sacramento (SMF) B

Effective 2026-06-07 through 2026-08-02

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun

Duration: 4:25, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.

Direct Flights:

Southwest Airlines WN4121

21:55

Chicago Midway (MDW)

00:20(+1)

Sacramento (SMF) B

Effective 2026-06-04 through 2026-08-03

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 4:25, 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

Valid until 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.

Non-Direct Flights:

Southwest Airlines WN4121

17:40

Tampa (TPA)

22:40

Oakland (OAK) 2

Effective 2026-02-12 through 2026-02-16

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 8:00, 1-stop
Boeing 737 MAX 8 (7M8)

Non-Direct Flights:

Southwest Airlines WN4121

17:40

Tampa (TPA)

22:40

Oakland (OAK) 2

Effective 2026-02-20 through 2026-03-01

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 8:00, 1-stop
Boeing 737 MAX 8 (7M8)

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Parallax here

This flight number is listed as serving the following routes:

Chicago Midway (MDW) - Sacramento (SMF)
Phoenix Sky Harbor (PHX) - Salt Lake City (SLC)
Phoenix Sky Harbor (PHX) - San Antonio (SAT)
San Diego (SAN) - Oakland (OAK)
Seattle-Tacoma (SEA) - Phoenix Sky Harbor (PHX)
Seattle-Tacoma (SEA) - San Antonio (SAT)
Tampa (TPA) - Oakland (OAK)
Tampa (TPA) - San Diego (SAN)

All Southwest Airlines flights

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