Southwest Airlines flight WN 3999: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Mon,Thu,Fri 10:50 Portland (PDX) 12:20 Sacramento (SMF) B
WN 3999 Non-stop Boeing 737-800 (73H) 1:30 Effective 2025-08-07 through 2025-09-29
Mon-Wed 12:25 Oakland (OAK) 2 13:55 Eugene (EUG)
WN 3999 Non-stop Boeing 737-700 (Scimitar Winglets) 1:30 Effective 2025-11-25 through 2025-12-01
Mon,Tue,Fri,Sun 12:25 Oakland (OAK) 2 13:55 Eugene (EUG)
WN 3999 Non-stop Boeing 737-700 (Scimitar Winglets) 1:30 Effective 2025-12-19 through 2026-01-04
Fri 12:40 El Paso (ELP) 15:35 Houston Hobby (HOU)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 1:55 Operates only on 2025-07-04
Tue,Wed 13:00 Sacramento (SMF) B 14:30 San Diego (SAN) 1
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 1:30 Effective 2025-08-05 through 2025-10-01
Mon,Thu,Fri 13:00 Sacramento (SMF) B 14:30 San Diego (SAN) 1
WN 3999 Non-stop Boeing 737-800 (73H) 1:30 Effective 2025-08-07 through 2025-09-29
Sat 13:20 Oakland (OAK) 2 14:50 Eugene (EUG)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 1:30 Effective 2025-11-22 through 2025-11-29
Sat 13:20 Oakland (OAK) 2 14:50 Eugene (EUG)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 1:30 Effective 2025-12-20 through 2026-01-03
Sat 13:30 Sacramento (SMF) B 15:00 San Diego (SAN) 1
WN 3999 Non-stop Boeing 737-800 (73H) 1:30 Effective 2025-08-09 through 2025-09-27
Tue,Wed 15:10 San Diego (SAN) 1 20:20 Kansas City (MCI)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 3:10 Effective 2025-08-05 through 2025-10-01
Mon,Thu,Fri 15:20 San Diego (SAN) 1 18:40 Denver (DEN)
WN 3999 Non-stop Boeing 737-800 (73H) 2:20 Effective 2025-08-07 through 2025-09-29
Sat 15:30 Eugene (EUG) 18:55 Denver (DEN)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 2:25 Effective 2025-11-22 through 2025-11-29
Sat 15:30 Eugene (EUG) 18:55 Denver (DEN)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 2:25 Effective 2025-12-20 through 2026-01-03
Sat 15:40 San Diego (SAN) 1 19:05 Denver (DEN)
WN 3999 Non-stop Boeing 737-800 (73H) 2:25 Effective 2025-08-09 through 2025-09-27
Sun 15:45 San Diego (SAN) 1 19:10 Denver (DEN)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 2:25 Effective 2025-08-10 through 2025-08-24
Sun 15:45 San Diego (SAN) 1 19:10 Denver (DEN)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 2:25 Effective 2025-09-07 through 2025-09-28
Sun 15:55 Minneapolis/Saint Paul (MSP) 2 17:05 Denver (DEN)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 2:10 Effective 2025-06-08 through 2025-08-03
Sun 20:40 Houston Hobby (HOU) 21:35 Phoenix Sky Harbor (PHX) 4
WN 3999 Non-stop Boeing 737-700 (73W) 2:55 Operates only on 2025-05-25
Sat 20:45 Houston Hobby (HOU) 21:40 Phoenix Sky Harbor (PHX) 4
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 2:55 Valid until 2025-05-31
Mon,Thu,Fri 21:35 Houston Hobby (HOU) 22:25 Phoenix Sky Harbor (PHX) 4
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 2:50 Valid until 2025-06-02
Mon,Thu,Fri,Sun 22:00 Las Vegas Harry Reid (LAS) 1 00:15 Tucson (TUS)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 1:15 Effective 2025-11-02 through 2025-11-16
The flight arrives 1 day after departure.
Mon,Fri,Sun 22:00 Las Vegas Harry Reid (LAS) 1 00:15 Tucson (TUS)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 1:15 Effective 2025-11-21 through 2025-11-28
The flight arrives 1 day after departure.
Fri,Sun 22:00 Las Vegas Harry Reid (LAS) 1 00:15 Tucson (TUS)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 1:15 Effective 2025-12-07 through 2025-12-14
The flight arrives 1 day after departure.
Thu 22:00 Las Vegas Harry Reid (LAS) 1 00:15 Tucson (TUS)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 1:15 Operates only on 2025-12-18
The flight arrives 1 day after departure.
Mon 22:00 Las Vegas Harry Reid (LAS) 1 00:15 Tucson (TUS)
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 1:15 Operates only on 2026-01-05
The flight arrives 1 day after departure.
Sun 22:35 Houston Hobby (HOU) 23:25 Phoenix Sky Harbor (PHX) 4
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 2:50 Valid until 2025-05-18
Sun 22:35 Houston Hobby (HOU) 23:25 Phoenix Sky Harbor (PHX) 4
WN 3999 Non-stop Boeing 737 MAX 8 (7M8) 2:50 Operates only on 2025-06-01
Sun 22:55 Las Vegas Harry Reid (LAS) 1 01:10 Tucson (TUS)
WN 3999 Non-stop Boeing 737-700 (Scimitar Winglets) 1:15 Operates only on 2025-11-30
The flight arrives 1 day after departure.
Non-Direct Flights:
Mon,Thu,Fri 10:50 Portland (PDX) 14:30 San Diego (SAN) 1
WN 3999 1-stop Boeing 737-800 (73H) 3:40 Effective 2025-08-07 through 2025-09-29
Tue,Wed 13:00 Sacramento (SMF) B 20:20 Kansas City (MCI)
WN 3999 1-stop Boeing 737 MAX 8 (7M8) 5:20 Effective 2025-08-05 through 2025-10-01
Mon,Thu,Fri 13:00 Sacramento (SMF) B 18:40 Denver (DEN)
WN 3999 1-stop Boeing 737-800 (73H) 4:40 Effective 2025-08-07 through 2025-09-29
Sat 13:20 Oakland (OAK) 2 18:55 Denver (DEN)
WN 3999 1-stop Boeing 737 MAX 8 (7M8) 4:35 Effective 2025-11-22 through 2025-11-29
Sat 13:20 Oakland (OAK) 2 18:55 Denver (DEN)
WN 3999 1-stop Boeing 737 MAX 8 (7M8) 4:35 Effective 2025-12-20 through 2026-01-03
Sat 13:30 Sacramento (SMF) B 19:05 Denver (DEN)
WN 3999 1-stop Boeing 737-800 (73H) 4:35 Effective 2025-08-09 through 2025-09-27
Mon,Thu,Fri 10:50 Portland (PDX) 18:40 Denver (DEN)
WN 3999 2-stop Boeing 737-800 (73H) 6:50 Effective 2025-08-07 through 2025-09-29
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This flight number is listed as serving the following routes:


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Southwest Airlines flight WN 3999: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Southwest Airlines WN3999
10:50
Portland (PDX)

12:20
Sacramento (SMF) B
Effective 2025-08-07 through 2025-09-29
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 1:30, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3999
12:25
Oakland (OAK) 2

13:55
Eugene (EUG)
Effective 2025-11-25 through 2025-12-01
Mon
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:30, non-stop
Boeing 737-700 (Scimitar Winglets)
Southwest Airlines WN3999
12:25
Oakland (OAK) 2

13:55
Eugene (EUG)
Effective 2025-12-19 through 2026-01-04
Mon
Tue
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 1:30, non-stop
Boeing 737-700 (Scimitar Winglets)
Southwest Airlines WN3999
12:40
El Paso (ELP)

15:35
Houston Hobby (HOU)
Operates only on 2025-07-04
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Duration: 1:55, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
13:00
Sacramento (SMF) B

14:30
San Diego (SAN) 1
Effective 2025-08-05 through 2025-10-01
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:30, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
13:00
Sacramento (SMF) B

14:30
San Diego (SAN) 1
Effective 2025-08-07 through 2025-09-29
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 1:30, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3999
13:20
Oakland (OAK) 2

14:50
Eugene (EUG)
Effective 2025-11-22 through 2025-11-29
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:30, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
13:20
Oakland (OAK) 2

14:50
Eugene (EUG)
Effective 2025-12-20 through 2026-01-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:30, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
13:30
Sacramento (SMF) B

15:00
San Diego (SAN) 1
Effective 2025-08-09 through 2025-09-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:30, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3999
15:10
San Diego (SAN) 1

20:20
Kansas City (MCI)
Effective 2025-08-05 through 2025-10-01
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 3:10, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
15:20
San Diego (SAN) 1

18:40
Denver (DEN)
Effective 2025-08-07 through 2025-09-29
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 2:20, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3999
15:30
Eugene (EUG)

18:55
Denver (DEN)
Effective 2025-11-22 through 2025-11-29
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:25, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
15:30
Eugene (EUG)

18:55
Denver (DEN)
Effective 2025-12-20 through 2026-01-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:25, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
15:40
San Diego (SAN) 1

19:05
Denver (DEN)
Effective 2025-08-09 through 2025-09-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:25, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3999
15:45
San Diego (SAN) 1

19:10
Denver (DEN)
Effective 2025-08-10 through 2025-08-24
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:25, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
15:45
San Diego (SAN) 1

19:10
Denver (DEN)
Effective 2025-09-07 through 2025-09-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:25, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
15:55
Minneapolis/Saint Paul (MSP) 2

17:05
Denver (DEN)
Effective 2025-06-08 through 2025-08-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:10, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
20:40
Houston Hobby (HOU)

21:35
Phoenix Sky Harbor (PHX) 4
Operates only on 2025-05-25
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:55, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3999
20:45
Houston Hobby (HOU)

21:40
Phoenix Sky Harbor (PHX) 4
Valid until 2025-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:55, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
21:35
Houston Hobby (HOU)

22:25
Phoenix Sky Harbor (PHX) 4
Valid until 2025-06-02
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 2:50, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
22:00
Las Vegas Harry Reid (LAS) 1

00:15(+1)
Tucson (TUS)
Effective 2025-11-02 through 2025-11-16
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 1:15, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Southwest Airlines WN3999
22:00
Las Vegas Harry Reid (LAS) 1

00:15(+1)
Tucson (TUS)
Effective 2025-11-21 through 2025-11-28
Mon
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 1:15, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Southwest Airlines WN3999
22:00
Las Vegas Harry Reid (LAS) 1

00:15(+1)
Tucson (TUS)
Effective 2025-12-07 through 2025-12-14
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 1:15, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Southwest Airlines WN3999
22:00
Las Vegas Harry Reid (LAS) 1

00:15(+1)
Tucson (TUS)
Operates only on 2025-12-18
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 1:15, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Southwest Airlines WN3999
22:00
Las Vegas Harry Reid (LAS) 1

00:15(+1)
Tucson (TUS)
Operates only on 2026-01-05
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:15, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Southwest Airlines WN3999
22:35
Houston Hobby (HOU)

23:25
Phoenix Sky Harbor (PHX) 4
Valid until 2025-05-18
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:50, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
22:35
Houston Hobby (HOU)

23:25
Phoenix Sky Harbor (PHX) 4
Operates only on 2025-06-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:50, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
22:55
Las Vegas Harry Reid (LAS) 1

01:10(+1)
Tucson (TUS)
Operates only on 2025-11-30
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:15, non-stop
Boeing 737-700 (Scimitar Winglets)
The flight arrives 1 day after departure.
Non-Direct Flights:
Southwest Airlines WN3999
10:50
Portland (PDX)

14:30
San Diego (SAN) 1
Effective 2025-08-07 through 2025-09-29
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 3:40, 1-stop
Boeing 737-800 (73H)
Southwest Airlines WN3999
13:00
Sacramento (SMF) B

20:20
Kansas City (MCI)
Effective 2025-08-05 through 2025-10-01
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 5:20, 1-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
13:00
Sacramento (SMF) B

18:40
Denver (DEN)
Effective 2025-08-07 through 2025-09-29
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 4:40, 1-stop
Boeing 737-800 (73H)
Southwest Airlines WN3999
13:20
Oakland (OAK) 2

18:55
Denver (DEN)
Effective 2025-11-22 through 2025-11-29
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 4:35, 1-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
13:20
Oakland (OAK) 2

18:55
Denver (DEN)
Effective 2025-12-20 through 2026-01-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 4:35, 1-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3999
13:30
Sacramento (SMF) B

19:05
Denver (DEN)
Effective 2025-08-09 through 2025-09-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 4:35, 1-stop
Boeing 737-800 (73H)
Southwest Airlines WN3999
10:50
Portland (PDX)

18:40
Denver (DEN)
Effective 2025-08-07 through 2025-09-29
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 6:50, 2-stop
Boeing 737-800 (73H)
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This flight number is listed as serving the following routes:
  • El Paso (ELP) - Houston Hobby (HOU)
  • Eugene (EUG) - Denver (DEN)
  • Houston Hobby (HOU) - Phoenix Sky Harbor (PHX)
  • Las Vegas Harry Reid (LAS) - Tucson (TUS)
  • Minneapolis/Saint Paul (MSP) - Denver (DEN)
  • Oakland (OAK) - Denver (DEN)
  • Oakland (OAK) - Eugene (EUG)
  • Portland (PDX) - Denver (DEN)
  • Portland (PDX) - Sacramento (SMF)
  • Portland (PDX) - San Diego (SAN)
  • Sacramento (SMF) - Denver (DEN)
  • Sacramento (SMF) - Kansas City (MCI)
  • Sacramento (SMF) - San Diego (SAN)
  • San Diego (SAN) - Denver (DEN)
  • San Diego (SAN) - Kansas City (MCI)
All Southwest Airlines flights
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