Southwest Airlines flight WN 3878: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Tue,Wed 13:35 Nashville (BNA) 16:10 Austin (AUS)
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 2:35 Effective 2026-03-10 through 2026-04-01
Sun 16:00 Santa Rosa (STS) 17:20 Burbank (BUR)
WN 3878 Non-stop Boeing 737-700 (Scimitar Winglets) 1:20 Effective 2026-06-07 through 2026-08-02
Tue,Wed 16:10 Phoenix Sky Harbor (PHX) 4 22:30 Louisville (SDF)
WN 3878 Non-stop Boeing 737-800 (73H) 3:20 Effective 2026-04-07 through 2026-06-03
Mon,Thu,Fri 17:55 Phoenix Sky Harbor (PHX) 4 00:15 Louisville (SDF)
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 3:20 Effective 2026-04-09 through 2026-06-01
The flight arrives 1 day after departure.
Sun 18:20 Kansas City (MCI) 19:45 Chicago Midway (MDW)
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 1:25 Effective 2026-03-08 through 2026-04-05
Sun 20:25 Chicago Midway (MDW) 23:25 New York LaGuardia (LGA) B
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 2:00 Effective 2026-03-08 through 2026-04-05
Tue,Wed 20:45 Saint Louis (STL) 2 21:55 Phoenix Sky Harbor (PHX) 4
WN 3878 Non-stop Boeing 737-800 (73H) 3:10 Effective 2026-08-04 through 2026-09-30
Mon,Thu,Fri 20:45 Saint Louis (STL) 2 21:55 Phoenix Sky Harbor (PHX) 4
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 3:10 Effective 2026-08-06 through 2026-09-28
Sun 21:15 Saint Louis (STL) 2 22:25 Phoenix Sky Harbor (PHX) 4
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 3:10 Effective 2026-08-09 through 2026-09-27
Mon,Tue,Fri-Sun 22:40 Las Vegas Harry Reid (LAS) 1 01:25 Seattle-Tacoma (SEA)
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 2:45 Valid until 2026-01-04
The flight arrives 1 day after departure.
Non-Direct Flights:
Sun 18:20 Kansas City (MCI) 23:25 New York LaGuardia (LGA) B
WN 3878 1-stop Boeing 737 MAX 8 (7M8) 4:05 Effective 2026-03-08 through 2026-04-05
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This flight number is listed as serving the following routes:


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Southwest Airlines flight WN 3878: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Southwest Airlines WN3878
13:35
Nashville (BNA)

16:10
Austin (AUS)
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 WN3878
16:00
Santa Rosa (STS)

17:20
Burbank (BUR)
Effective 2026-06-07 through 2026-08-02
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:20, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3878
16:10
Phoenix Sky Harbor (PHX) 4

22:30
Louisville (SDF)
Effective 2026-04-07 through 2026-06-03
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 3:20, non-stop
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3878
17:55
Phoenix Sky Harbor (PHX) 4

00:15(+1)
Louisville (SDF)
Effective 2026-04-09 through 2026-06-01
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 3:20, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Direct Flights:
Southwest Airlines WN3878
18:20
Kansas City (MCI)

19:45
Chicago Midway (MDW)
Effective 2026-03-08 through 2026-04-05
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:25, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3878
20:25
Chicago Midway (MDW)

23:25
New York LaGuardia (LGA) B
Effective 2026-03-08 through 2026-04-05
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:00, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3878
20:45
Saint Louis (STL) 2

21:55
Phoenix Sky Harbor (PHX) 4
Effective 2026-08-04 through 2026-09-30
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 3:10, non-stop
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3878
20:45
Saint Louis (STL) 2

21:55
Phoenix Sky Harbor (PHX) 4
Effective 2026-08-06 through 2026-09-28
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 3:10, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3878
21:15
Saint Louis (STL) 2

22:25
Phoenix Sky Harbor (PHX) 4
Effective 2026-08-09 through 2026-09-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 3:10, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3878
22:40
Las Vegas Harry Reid (LAS) 1

01:25(+1)
Seattle-Tacoma (SEA)
Valid until 2026-01-04
Mon
Tue
Wed
-
Thu
-
Fri
Sat
Sun
Duration: 2:45, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Non-Direct Flights:
Southwest Airlines WN3878
18:20
Kansas City (MCI)

23:25
New York LaGuardia (LGA) B
Effective 2026-03-08 through 2026-04-05
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 4:05, 1-stop
Boeing 737 MAX 8 (7M8)
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This flight number is listed as serving the following routes:
  • Chicago Midway (MDW) - New York LaGuardia (LGA)
  • Kansas City (MCI) - Chicago Midway (MDW)
  • Kansas City (MCI) - New York LaGuardia (LGA)
  • Las Vegas Harry Reid (LAS) - Seattle-Tacoma (SEA)
  • Nashville (BNA) - Austin (AUS)
  • Phoenix Sky Harbor (PHX) - Louisville (SDF)
  • Saint Louis (STL) - Phoenix Sky Harbor (PHX)
  • Santa Rosa (STS) - Burbank (BUR)
All Southwest Airlines flights
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