Southwest Airlines flight WN 421: Multiple routes

FLIGHT SCHEDULE
Direct Flights:
Sat 06:10 Austin (AUS) 06:45 Phoenix Sky Harbor (PHX) 4 WN 421 Non-stop Boeing 737 MAX 8 (7M8) 2:35 Effective 2026-04-11 through 2026-05-30
Sun 06:25 Austin (AUS) 07:00 Phoenix Sky Harbor (PHX) 4 WN 421 Non-stop Boeing 737-700 (Scimitar Winglets) 2:35 Effective 2026-04-12 through 2026-05-17
Sun 06:25 Austin (AUS) 07:00 Phoenix Sky Harbor (PHX) 4 WN 421 Non-stop Boeing 737-700 (Scimitar Winglets) 2:35 Operates only on 2026-05-31
Sun 06:35 San Diego (SAN) 1 10:10 Denver (DEN) WN 421 Non-stop Boeing 737 MAX 8 (7M8) 2:35 Effective 2026-03-08 through 2026-04-05
Mon,Thu,Fri 06:40 Austin (AUS) 07:15 Phoenix Sky Harbor (PHX) 4 WN 421 Non-stop Boeing 737-700 (Scimitar Winglets) 2:35 Effective 2026-04-09 through 2026-06-01
Wed,Thu 06:55 Dallas Love Field (DAL) 1 10:25 Orlando (MCO) WN 421 Non-stop Boeing 737-800 (73H) 2:30 Valid until 2026-01-01
Tue,Wed 07:25 Kansas City (MCI) 09:25 Austin (AUS) WN 421 Non-stop Boeing 737-700 (Scimitar Winglets) 2:00 Effective 2026-04-07 through 2026-06-03
Sun 07:45 Austin (AUS) 08:20 Phoenix Sky Harbor (PHX) 4 WN 421 Non-stop Boeing 737 MAX 8 (7M8) 2:35 Operates only on 2026-05-24
Tue,Wed 08:30 San Diego (SAN) 1 11:25 Albuquerque (ABQ) WN 421 Non-stop Boeing 737-700 (Scimitar Winglets) 1:55 Effective 2026-03-10 through 2026-04-01
Mon,Thu,Fri 08:35 San Diego (SAN) 1 11:30 Albuquerque (ABQ) WN 421 Non-stop Boeing 737-800 (73H) 1:55 Effective 2026-03-05 through 2026-04-06
Mon,Thu,Fri 09:00 Hartford (BDL) 10:20 Baltimore (BWI) WN 421 Non-stop Boeing 737 MAX 8 (7M8) 1:20 Effective 2026-06-04 through 2026-08-03
Tue,Wed 10:00 Austin (AUS) 10:35 Phoenix Sky Harbor (PHX) 4 WN 421 Non-stop Boeing 737-700 (Scimitar Winglets) 2:35 Effective 2026-04-07 through 2026-06-03
Mon,Thu,Fri 10:15 Denver (DEN) 11:55 Sacramento (SMF) B WN 421 Non-stop Boeing 737 MAX 8 (7M8) 2:40 Effective 2026-08-06 through 2026-09-28
Tue,Wed 13:30 Las Vegas Harry Reid (LAS) 1 20:50 Pittsburgh (PIT) WN 421 Non-stop Boeing 737 MAX 8 (7M8) 4:20 Effective 2026-08-04 through 2026-09-30
Sat 15:20 Colorado Springs (COS) 16:15 Denver (DEN) WN 421 Non-stop Boeing 737-800 (73H) 0:55 Effective 2026-01-10 through 2026-02-07
Mon-Fri 16:35 Colorado Springs (COS) 17:30 Denver (DEN) WN 421 Non-stop Boeing 737-800 (73H) 0:55 Effective 2026-01-06 through 2026-01-14
Tue-Fri,Sun 16:35 Colorado Springs (COS) 17:30 Denver (DEN) WN 421 Non-stop Boeing 737-800 (73H) 0:55 Effective 2026-01-18 through 2026-01-23
Mon-Fri 16:35 Colorado Springs (COS) 17:30 Denver (DEN) WN 421 Non-stop Boeing 737-800 (73H) 0:55 Effective 2026-01-26 through 2026-02-04
Tue,Wed,Sun 16:35 Colorado Springs (COS) 17:30 Denver (DEN) WN 421 Non-stop Boeing 737-800 (73H) 0:55 Effective 2026-02-08 through 2026-02-11
Tue,Wed 16:35 Colorado Springs (COS) 17:30 Denver (DEN) WN 421 Non-stop Boeing 737-800 (73H) 0:55 Effective 2026-02-18 through 2026-03-04
Sat 16:40 Colorado Springs (COS) 17:35 Denver (DEN) WN 421 Non-stop Boeing 737-800 (73H) 0:55 Effective 2026-02-14 through 2026-02-28
Mon,Thu,Fri 16:50 Colorado Springs (COS) 17:45 Denver (DEN) WN 421 Non-stop Boeing 737-800 (73H) 0:55 Effective 2026-02-05 through 2026-02-09
Tue,Thu,Sun 16:50 Colorado Springs (COS) 17:45 Denver (DEN) WN 421 Non-stop Boeing 737 MAX 8 (7M8) 0:55 Effective 2026-02-15 through 2026-02-19
Mon 16:50 Colorado Springs (COS) 17:45 Denver (DEN) WN 421 Non-stop Boeing 737 MAX 8 (7M8) 0:55 Operates only on 2026-02-23
Mon 16:50 Colorado Springs (COS) 17:45 Denver (DEN) WN 421 Non-stop Boeing 737-800 (73H) 0:55 Operates only on 2026-03-02
Thu,Fri,Sun 16:55 Colorado Springs (COS) 17:55 Denver (DEN) WN 421 Non-stop Boeing 737-800 (73H) 1:00 Effective 2026-01-11 through 2026-01-16
Mon,Sun 16:55 Colorado Springs (COS) 17:55 Denver (DEN) WN 421 Non-stop Boeing 737-800 (73H) 1:00 Effective 2026-01-19 through 2026-01-25
Sun 16:55 Colorado Springs (COS) 17:55 Denver (DEN) WN 421 Non-stop Boeing 737-800 (73H) 1:00 Operates only on 2026-02-01
Sat 16:55 Denver (DEN) 20:05 San Antonio (SAT) A WN 421 Non-stop Boeing 737-700 (Scimitar Winglets) 2:10 Effective 2026-03-07 through 2026-04-04
Mon,Thu,Fri 18:10 Colorado Springs (COS) 19:00 Denver (DEN) WN 421 Non-stop Boeing 737 MAX 8 (7M8) 0:50 Effective 2026-02-12 through 2026-02-16
Thu,Fri,Sun 18:10 Colorado Springs (COS) 19:00 Denver (DEN) WN 421 Non-stop Boeing 737 MAX 8 (7M8) 0:50 Effective 2026-02-20 through 2026-03-01
Sun 18:25 Las Vegas Harry Reid (LAS) 1 01:40 Pittsburgh (PIT) WN 421 Non-stop Boeing 737-800 (73H) 4:15 Effective 2026-08-09 through 2026-09-27 The flight arrives 1 day after departure.
Sat 19:30 Atlanta (ATL) N 21:00 Orlando (MCO) WN 421 Non-stop Boeing 737-700 (Scimitar Winglets) 1:30 Operates only on 2026-01-03
Fri,Sun 19:35 Atlanta (ATL) N 21:05 Orlando (MCO) WN 421 Non-stop Boeing 737-700 (Scimitar Winglets) 1:30 Effective 2026-01-02 through 2026-01-04
Sun 21:25 Albuquerque (ABQ) 22:30 Los Angeles (LAX) 1 WN 421 Non-stop Boeing 737-700 (Scimitar Winglets) 2:05 Effective 2026-06-07 through 2026-08-02
Tue,Wed 21:55 Orlando (MCO) 00:15 Baltimore (BWI) WN 421 Non-stop Boeing 737 MAX 8 (7M8) 2:20 Effective 2026-06-09 through 2026-07-29 The flight arrives 1 day after departure.
Non-Direct Flights:
Tue,Wed 07:25 Kansas City (MCI) 10:35 Phoenix Sky Harbor (PHX) 4 WN 421 1-stop Boeing 737-700 (Scimitar Winglets) 5:10 Effective 2026-04-07 through 2026-06-03

This flight number is listed as serving the following routes:

Albuquerque (ABQ) - Los Angeles (LAX)
Atlanta (ATL) - Orlando (MCO)
Austin (AUS) - Phoenix Sky Harbor (PHX)
Colorado Springs (COS) - Denver (DEN)
Dallas Love Field (DAL) - Orlando (MCO)
Denver (DEN) - Sacramento (SMF)
Denver (DEN) - San Antonio (SAT)
Hartford (BDL) - Baltimore (BWI)
Kansas City (MCI) - Austin (AUS)
Kansas City (MCI) - Phoenix Sky Harbor (PHX)
Las Vegas Harry Reid (LAS) - Pittsburgh (PIT)
Orlando (MCO) - Baltimore (BWI)
San Diego (SAN) - Albuquerque (ABQ)
San Diego (SAN) - Denver (DEN)

All Southwest Airlines flights

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Southwest Airlines flight WN 421: Multiple routes

FLIGHT SCHEDULE

Direct Flights:

Southwest Airlines WN421

06:10

Austin (AUS)

06:45

Phoenix Sky Harbor (PHX) 4

Effective 2026-04-11 through 2026-05-30

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

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

Direct Flights:

Southwest Airlines WN421

06:25

Austin (AUS)

07:00

Phoenix Sky Harbor (PHX) 4

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

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

Direct Flights:

Southwest Airlines WN421

06:25

Austin (AUS)

07:00

Phoenix Sky Harbor (PHX) 4

Operates only on 2026-05-31

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

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

Direct Flights:

Southwest Airlines WN421

06:35

San Diego (SAN) 1

10:10

Denver (DEN)

Effective 2026-03-08 through 2026-04-05

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

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

Direct Flights:

Southwest Airlines WN421

06:40

Austin (AUS)

07:15

Phoenix Sky Harbor (PHX) 4

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

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

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

Direct Flights:

Southwest Airlines WN421

06:55

Dallas Love Field (DAL) 1

10:25

Orlando (MCO)

Valid until 2026-01-01

Mon
-

Tue
-

Wed

Thu

Fri
-

Sat
-

Sun
-

Duration: 2:30, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

07:25

Kansas City (MCI)

09:25

Austin (AUS)

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

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:00, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN421

07:45

Austin (AUS)

08:20

Phoenix Sky Harbor (PHX) 4

Operates only on 2026-05-24

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

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

Direct Flights:

Southwest Airlines WN421

08:30

San Diego (SAN) 1

11:25

Albuquerque (ABQ)

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

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

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

Direct Flights:

Southwest Airlines WN421

08:35

San Diego (SAN) 1

11:30

Albuquerque (ABQ)

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

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

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

Direct Flights:

Southwest Airlines WN421

09:00

Hartford (BDL)

10:20

Baltimore (BWI)

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

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 1:20, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN421

10:00

Austin (AUS)

10:35

Phoenix Sky Harbor (PHX) 4

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

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

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

Direct Flights:

Southwest Airlines WN421

10:15

Denver (DEN)

11:55

Sacramento (SMF) B

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

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 2:40, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN421

13:30

Las Vegas Harry Reid (LAS) 1

20:50

Pittsburgh (PIT)

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

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 4:20, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN421

15:20

Colorado Springs (COS)

16:15

Denver (DEN)

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 0:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

16:35

Colorado Springs (COS)

17:30

Denver (DEN)

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

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun
-

Duration: 0:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

16:35

Colorado Springs (COS)

17:30

Denver (DEN)

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

Mon
-

Tue

Wed

Thu

Fri

Sat
-

Sun

Duration: 0:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

16:35

Colorado Springs (COS)

17:30

Denver (DEN)

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

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun
-

Duration: 0:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

16:35

Colorado Springs (COS)

17:30

Denver (DEN)

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

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun

Duration: 0:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

16:35

Colorado Springs (COS)

17:30

Denver (DEN)

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

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 0:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

16:40

Colorado Springs (COS)

17:35

Denver (DEN)

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 0:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

16:50

Colorado Springs (COS)

17:45

Denver (DEN)

Effective 2026-02-05 through 2026-02-09

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 0:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

16:50

Colorado Springs (COS)

17:45

Denver (DEN)

Effective 2026-02-15 through 2026-02-19

Mon
-

Tue

Wed
-

Thu

Fri
-

Sat
-

Sun

Duration: 0:55, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN421

16:50

Colorado Springs (COS)

17:45

Denver (DEN)

Operates only on 2026-02-23

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 0:55, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN421

16:50

Colorado Springs (COS)

17:45

Denver (DEN)

Operates only on 2026-03-02

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 0:55, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

16:55

Colorado Springs (COS)

17:55

Denver (DEN)

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

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 1:00, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

16:55

Colorado Springs (COS)

17:55

Denver (DEN)

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

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 1:00, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

16:55

Colorado Springs (COS)

17:55

Denver (DEN)

Operates only on 2026-02-01

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 1:00, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN421

16:55

Denver (DEN)

20:05

San Antonio (SAT) A

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:10, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN421

18:10

Colorado Springs (COS)

19:00

Denver (DEN)

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

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 0:50, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN421

18:10

Colorado Springs (COS)

19:00

Denver (DEN)

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

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 0:50, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN421

18:25

Las Vegas Harry Reid (LAS) 1

01:40(+1)

Pittsburgh (PIT)

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 4:15, non-stop
Boeing 737-800 (73H)
The flight arrives 1 day after departure.

Direct Flights:

Southwest Airlines WN421

19:30

Atlanta (ATL) N

21:00

Orlando (MCO)

Operates only on 2026-01-03

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 1:30, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN421

19:35

Atlanta (ATL) N

21:05

Orlando (MCO)

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun

Duration: 1:30, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN421

21:25

Albuquerque (ABQ)

22:30

Los Angeles (LAX) 1

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

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 2:05, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN421

21:55

Orlando (MCO)

00:15(+1)

Baltimore (BWI)

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

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:20, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.

Non-Direct Flights:

Southwest Airlines WN421

07:25

Kansas City (MCI)

10:35

Phoenix Sky Harbor (PHX) 4

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

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 5:10, 1-stop
Boeing 737-700 (Scimitar Winglets)

This flight number is listed as serving the following routes:

Albuquerque (ABQ) - Los Angeles (LAX)
Atlanta (ATL) - Orlando (MCO)
Austin (AUS) - Phoenix Sky Harbor (PHX)
Colorado Springs (COS) - Denver (DEN)
Dallas Love Field (DAL) - Orlando (MCO)
Denver (DEN) - Sacramento (SMF)
Denver (DEN) - San Antonio (SAT)
Hartford (BDL) - Baltimore (BWI)
Kansas City (MCI) - Austin (AUS)
Kansas City (MCI) - Phoenix Sky Harbor (PHX)
Las Vegas Harry Reid (LAS) - Pittsburgh (PIT)
Orlando (MCO) - Baltimore (BWI)
San Diego (SAN) - Albuquerque (ABQ)
San Diego (SAN) - Denver (DEN)

All Southwest Airlines flights

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