Southwest Airlines flight WN 3978: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Sat 10:35 Orlando (MCO) 13:30 Luis Munoz Marin, San Juan (SJU) B
WN 3978 Non-stop Boeing 737-800 (73H) 2:55 Effective 2025-10-04 through 2025-11-01
Sun 10:35 Orlando (MCO) 13:30 Luis Munoz Marin, San Juan (SJU) B
WN 3978 Non-stop Boeing 737 MAX 8 (7M8) 2:55 Effective 2025-10-05 through 2025-10-26
Tue,Wed 10:50 Orlando (MCO) 13:45 Luis Munoz Marin, San Juan (SJU) B
WN 3978 Non-stop Boeing 737 MAX 8 (7M8) 2:55 Effective 2025-10-07 through 2025-10-29
Sat 11:20 Manchester (MHT) 14:35 Orlando (MCO)
WN 3978 Non-stop Boeing 737-700 (73W) 3:15 Valid until 2025-05-31
Mon,Thu,Fri 11:50 Orlando (MCO) 14:45 Luis Munoz Marin, San Juan (SJU) B
WN 3978 Non-stop Boeing 737-800 (73H) 2:55 Effective 2025-10-02 through 2025-10-31
Mon,Thu,Fri,Sun 16:15 Ontario, Los Angeles (ONT) 4 19:25 Denver (DEN)
WN 3978 Non-stop Boeing 737 MAX 8 (7M8) 2:10 Effective 2025-11-02 through 2025-11-16
Mon,Fri,Sun 16:15 Ontario, Los Angeles (ONT) 4 19:25 Denver (DEN)
WN 3978 Non-stop Boeing 737 MAX 8 (7M8) 2:10 Effective 2025-11-21 through 2025-11-28
Fri,Sun 16:15 Ontario, Los Angeles (ONT) 4 19:25 Denver (DEN)
WN 3978 Non-stop Boeing 737 MAX 8 (7M8) 2:10 Effective 2025-12-07 through 2025-12-14
Thu 16:15 Ontario, Los Angeles (ONT) 4 19:25 Denver (DEN)
WN 3978 Non-stop Boeing 737 MAX 8 (7M8) 2:10 Operates only on 2025-12-18
Mon 16:15 Ontario, Los Angeles (ONT) 4 19:25 Denver (DEN)
WN 3978 Non-stop Boeing 737 MAX 8 (7M8) 2:10 Operates only on 2026-01-05
Tue,Wed 17:25 Atlanta (ATL) N 18:25 Midway, Chicago (MDW)
WN 3978 Non-stop Boeing 737-700 (73W) 2:00 Effective 2025-06-10 through 2025-07-30
Mon,Thu,Fri 18:05 Boise (BOI) 18:50 Oakland (OAK) 2
WN 3978 Non-stop Boeing 737 MAX 8 (7M8) 1:45 Valid until 2025-06-02
Sat 18:20 San Diego (SAN) 1 19:45 Phoenix Sky Harbor (PHX) 4
WN 3978 Non-stop Boeing 737 MAX 8 (7M8) 1:25 Effective 2025-06-07 through 2025-08-02
Sun 18:40 Boise (BOI) 19:20 Oakland (OAK) 2
WN 3978 Non-stop Boeing 737-800 (73H) 1:40 Valid until 2025-05-18
Sun 18:40 Boise (BOI) 19:20 Oakland (OAK) 2
WN 3978 Non-stop Boeing 737-800 (73H) 1:40 Operates only on 2025-06-01
Tue,Wed 19:05 Midway, Chicago (MDW) 21:15 San Diego (SAN) 1
WN 3978 Non-stop Boeing 737-700 (73W) 4:10 Effective 2025-06-10 through 2025-07-30
Sun 20:25 Atlanta (ATL) N 21:25 Midway, Chicago (MDW)
WN 3978 Non-stop Boeing 737 MAX 8 (7M8) 2:00 Effective 2025-06-08 through 2025-08-03
Daily 21:05 Portland (PDX) 05:05 Baltimore (BWI)
WN 3978 Non-stop Boeing 737-800 (73H) 5:00 Effective 2025-08-05 through 2025-10-01
The flight arrives 1 day after departure.
Mon,Thu,Fri 21:55 Atlanta (ATL) N 22:55 Midway, Chicago (MDW)
WN 3978 Non-stop Boeing 737-700 (73W) 2:00 Effective 2025-06-05 through 2025-07-03
Mon,Thu,Fri 21:55 Atlanta (ATL) N 22:55 Midway, Chicago (MDW)
WN 3978 Non-stop Boeing 737-700 (73W) 2:00 Effective 2025-07-07 through 2025-08-04
Non-Direct Flights:
Tue,Wed 17:25 Atlanta (ATL) N 21:15 San Diego (SAN) 1
WN 3978 1-stop Boeing 737-700 (73W) 6:50 Effective 2025-06-10 through 2025-07-30
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This flight number is listed as serving the following routes:


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Southwest Airlines flight WN 3978: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Southwest Airlines WN3978
10:35
Orlando (MCO)

13:30
Luis Munoz Marin, San Juan (SJU) B
Effective 2025-10-04 through 2025-11-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:55, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3978
10:35
Orlando (MCO)

13:30
Luis Munoz Marin, San Juan (SJU) B
Effective 2025-10-05 through 2025-10-26
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:55, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3978
10:50
Orlando (MCO)

13:45
Luis Munoz Marin, San Juan (SJU) B
Effective 2025-10-07 through 2025-10-29
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:55, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3978
11:20
Manchester (MHT)

14:35
Orlando (MCO)
Valid until 2025-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 3:15, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3978
11:50
Orlando (MCO)

14:45
Luis Munoz Marin, San Juan (SJU) B
Effective 2025-10-02 through 2025-10-31
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 2:55, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3978
16:15
Ontario, Los Angeles (ONT) 4

19:25
Denver (DEN)
Effective 2025-11-02 through 2025-11-16
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 2:10, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3978
16:15
Ontario, Los Angeles (ONT) 4

19:25
Denver (DEN)
Effective 2025-11-21 through 2025-11-28
Mon
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 2:10, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3978
16:15
Ontario, Los Angeles (ONT) 4

19:25
Denver (DEN)
Effective 2025-12-07 through 2025-12-14
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 2:10, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3978
16:15
Ontario, Los Angeles (ONT) 4

19:25
Denver (DEN)
Operates only on 2025-12-18
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 2:10, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3978
16:15
Ontario, Los Angeles (ONT) 4

19:25
Denver (DEN)
Operates only on 2026-01-05
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:10, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3978
17:25
Atlanta (ATL) N

18:25
Midway, Chicago (MDW)
Effective 2025-06-10 through 2025-07-30
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:00, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3978
18:05
Boise (BOI)

18:50
Oakland (OAK) 2
Valid until 2025-06-02
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 1:45, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3978
18:20
San Diego (SAN) 1

19:45
Phoenix Sky Harbor (PHX) 4
Effective 2025-06-07 through 2025-08-02
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:25, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3978
18:40
Boise (BOI)

19:20
Oakland (OAK) 2
Valid until 2025-05-18
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:40, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3978
18:40
Boise (BOI)

19:20
Oakland (OAK) 2
Operates only on 2025-06-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:40, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3978
19:05
Midway, Chicago (MDW)

21:15
San Diego (SAN) 1
Effective 2025-06-10 through 2025-07-30
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 4:10, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3978
20:25
Atlanta (ATL) N

21:25
Midway, Chicago (MDW)
Effective 2025-06-08 through 2025-08-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:00, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3978
21:05
Portland (PDX)

05:05(+1)
Baltimore (BWI)
Effective 2025-08-05 through 2025-10-01
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:00, non-stop
Boeing 737-800 (73H)
The flight arrives 1 day after departure.
Southwest Airlines WN3978
21:55
Atlanta (ATL) N

22:55
Midway, Chicago (MDW)
Effective 2025-06-05 through 2025-07-03
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 2:00, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3978
21:55
Atlanta (ATL) N

22:55
Midway, Chicago (MDW)
Effective 2025-07-07 through 2025-08-04
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 2:00, non-stop
Boeing 737-700 (73W)
Non-Direct Flights:
Southwest Airlines WN3978
17:25
Atlanta (ATL) N

21:15
San Diego (SAN) 1
Effective 2025-06-10 through 2025-07-30
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 6:50, 1-stop
Boeing 737-700 (73W)
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This flight number is listed as serving the following routes:
  • Atlanta (ATL) - Midway, Chicago (MDW)
  • Atlanta (ATL) - San Diego (SAN)
  • Boise (BOI) - Oakland (OAK)
  • Manchester (MHT) - Orlando (MCO)
  • Midway, Chicago (MDW) - San Diego (SAN)
  • Ontario, Los Angeles (ONT) - Denver (DEN)
  • Orlando (MCO) - Luis Munoz Marin, San Juan (SJU)
  • Portland (PDX) - Baltimore (BWI)
  • San Diego (SAN) - Phoenix Sky Harbor (PHX)
All Southwest Airlines flights
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