Southwest Airlines flight WN 4021: Multiple routes

FLIGHT SCHEDULE
Direct Flights:
Mon-Fri 05:05 San Francisco (SFO) 2 08:00 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737-800 (73H) 1:55 Effective 2026-01-06 through 2026-01-14
Tue-Fri,Sun 05:05 San Francisco (SFO) 2 08:00 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737-800 (73H) 1:55 Effective 2026-01-18 through 2026-01-23
Mon-Fri 05:05 San Francisco (SFO) 2 08:00 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737-800 (73H) 1:55 Effective 2026-01-26 through 2026-02-04
Tue,Wed,Sun 05:05 San Francisco (SFO) 2 08:00 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737-800 (73H) 1:55 Effective 2026-02-08 through 2026-02-11
Tue,Wed 05:05 San Francisco (SFO) 2 08:00 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737-800 (73H) 1:55 Effective 2026-02-18 through 2026-03-04
Tue,Wed 06:05 Denver (DEN) 09:35 Houston Hobby (HOU) WN 4021 Non-stop Boeing 737 MAX 8 (7M8) 2:30 Effective 2026-06-09 through 2026-07-29
Mon,Thu,Fri,Sun 07:20 Manchester (MHT) 08:55 Chicago Midway (MDW) WN 4021 Non-stop Boeing 737-700 (Scimitar Winglets) 2:35 Effective 2026-03-05 through 2026-04-06
Tue,Wed 07:25 Manchester (MHT) 09:00 Chicago Midway (MDW) WN 4021 Non-stop Boeing 737 MAX 8 (7M8) 2:35 Effective 2026-03-10 through 2026-04-01
Sat 10:15 Fort Lauderdale (FLL) 1 11:30 Nashville (BNA) WN 4021 Non-stop Boeing 737 MAX 8 (7M8) 2:15 Effective 2026-06-06 through 2026-08-01
Sat 10:20 San Francisco (SFO) 2 13:15 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737-800 (73H) 1:55 Effective 2026-02-14 through 2026-02-28
Sun 10:30 Reno (RNO) 12:20 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737-800 (73H) 1:50 Effective 2026-04-12 through 2026-05-17
Sun 10:30 Reno (RNO) 12:20 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737-800 (73H) 1:50 Operates only on 2026-05-31
Mon,Thu,Fri 10:35 San Francisco (SFO) 2 13:30 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737-800 (73H) 1:55 Effective 2026-02-12 through 2026-02-16
Fri,Sun 10:35 San Francisco (SFO) 2 13:30 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737 MAX 8 (7M8) 1:55 Effective 2026-02-20 through 2026-02-22
Thu,Fri,Sun 10:35 San Francisco (SFO) 2 13:30 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737-800 (73H) 1:55 Effective 2026-02-26 through 2026-03-01
Sat 10:45 San Francisco (SFO) 2 13:40 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737-700 (Scimitar Winglets) 1:55 Effective 2026-01-10 through 2026-02-07
Sun 10:45 Denver (DEN) 14:20 Birmingham (BHM) WN 4021 Non-stop Boeing 737-700 (Scimitar Winglets) 2:35 Effective 2026-08-09 through 2026-09-27
Tue,Wed 10:55 Reno (RNO) 12:40 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737 MAX 8 (7M8) 1:45 Effective 2026-04-07 through 2026-06-03
Mon,Thu,Fri 11:00 Reno (RNO) 12:45 Phoenix Sky Harbor (PHX) 4 WN 4021 Non-stop Boeing 737-700 (Scimitar Winglets) 1:45 Effective 2026-04-09 through 2026-06-01
Tue,Wed 11:05 Denver (DEN) 14:35 Birmingham (BHM) WN 4021 Non-stop Boeing 737 MAX 8 (7M8) 2:30 Effective 2026-08-04 through 2026-09-30
Sat 11:10 Denver (DEN) 14:40 Birmingham (BHM) WN 4021 Non-stop Boeing 737 MAX 8 (7M8) 2:30 Effective 2026-08-08 through 2026-09-26
Mon,Thu,Fri 11:45 Denver (DEN) 15:20 Birmingham (BHM) WN 4021 Non-stop Boeing 737-800 (73H) 2:35 Effective 2026-08-06 through 2026-09-28
Sun 15:50 Denver (DEN) 19:10 Milwaukee (MKE) WN 4021 Non-stop Boeing 737 MAX 8 (7M8) 2:20 Effective 2026-06-07 through 2026-08-02

This flight number is listed as serving the following routes:

Denver (DEN) - Birmingham (BHM)
Denver (DEN) - Houston Hobby (HOU)
Denver (DEN) - Milwaukee (MKE)
Fort Lauderdale (FLL) - Nashville (BNA)
Manchester (MHT) - Chicago Midway (MDW)
Reno (RNO) - Phoenix Sky Harbor (PHX)
San Francisco (SFO) - Phoenix Sky Harbor (PHX)

All Southwest Airlines flights

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Southwest Airlines flight WN 4021: Multiple routes

FLIGHT SCHEDULE

Direct Flights:

Southwest Airlines WN4021

05:05

San Francisco (SFO) 2

08:00

Phoenix Sky Harbor (PHX) 4

Effective 2026-01-06 through 2026-01-14

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun
-

Duration: 1:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4021

05:05

San Francisco (SFO) 2

08:00

Phoenix Sky Harbor (PHX) 4

Effective 2026-01-18 through 2026-01-23

Mon
-

Tue

Wed

Thu

Fri

Sat
-

Sun

Duration: 1:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4021

05:05

San Francisco (SFO) 2

08:00

Phoenix Sky Harbor (PHX) 4

Effective 2026-01-26 through 2026-02-04

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun
-

Duration: 1:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4021

05:05

San Francisco (SFO) 2

08:00

Phoenix Sky Harbor (PHX) 4

Effective 2026-02-08 through 2026-02-11

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun

Duration: 1:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4021

05:05

San Francisco (SFO) 2

08:00

Phoenix Sky Harbor (PHX) 4

Effective 2026-02-18 through 2026-03-04

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 1:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4021

06:05

Denver (DEN)

09:35

Houston Hobby (HOU)

Effective 2026-06-09 through 2026-07-29

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:30, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4021

07:20

Manchester (MHT)

08:55

Chicago Midway (MDW)

Effective 2026-03-05 through 2026-04-06

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 2:35, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN4021

07:25

Manchester (MHT)

09:00

Chicago Midway (MDW)

Effective 2026-03-10 through 2026-04-01

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:35, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4021

10:15

Fort Lauderdale (FLL) 1

11:30

Nashville (BNA)

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:15, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4021

10:20

San Francisco (SFO) 2

13:15

Phoenix Sky Harbor (PHX) 4

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 1:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4021

10:30

Reno (RNO)

12:20

Phoenix Sky Harbor (PHX) 4

Effective 2026-04-12 through 2026-05-17

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 1:50, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4021

10:30

Reno (RNO)

12:20

Phoenix Sky Harbor (PHX) 4

Operates only on 2026-05-31

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 1:50, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4021

10:35

San Francisco (SFO) 2

13:30

Phoenix Sky Harbor (PHX) 4

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

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 1:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4021

10:35

San Francisco (SFO) 2

13:30

Phoenix Sky Harbor (PHX) 4

Effective 2026-02-20 through 2026-02-22

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun

Duration: 1:55, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4021

10:35

San Francisco (SFO) 2

13:30

Phoenix Sky Harbor (PHX) 4

Effective 2026-02-26 through 2026-03-01

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 1:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4021

10:45

San Francisco (SFO) 2

13:40

Phoenix Sky Harbor (PHX) 4

Effective 2026-01-10 through 2026-02-07

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 1:55, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN4021

10:45

Denver (DEN)

14:20

Birmingham (BHM)

Effective 2026-08-09 through 2026-09-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 2:35, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN4021

10:55

Reno (RNO)

12:40

Phoenix Sky Harbor (PHX) 4

Effective 2026-04-07 through 2026-06-03

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

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

Direct Flights:

Southwest Airlines WN4021

11:00

Reno (RNO)

12:45

Phoenix Sky Harbor (PHX) 4

Effective 2026-04-09 through 2026-06-01

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 1:45, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN4021

11:05

Denver (DEN)

14:35

Birmingham (BHM)

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

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:30, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4021

11:10

Denver (DEN)

14:40

Birmingham (BHM)

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:30, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN4021

11:45

Denver (DEN)

15:20

Birmingham (BHM)

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

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 2:35, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN4021

15:50

Denver (DEN)

19:10

Milwaukee (MKE)

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 2:20, non-stop
Boeing 737 MAX 8 (7M8)

This flight number is listed as serving the following routes:

Denver (DEN) - Birmingham (BHM)
Denver (DEN) - Houston Hobby (HOU)
Denver (DEN) - Milwaukee (MKE)
Fort Lauderdale (FLL) - Nashville (BNA)
Manchester (MHT) - Chicago Midway (MDW)
Reno (RNO) - Phoenix Sky Harbor (PHX)
San Francisco (SFO) - Phoenix Sky Harbor (PHX)

All Southwest Airlines flights

Feedback - Disclaimer - Privacy