Southwest Airlines flight WN 3878: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Tue,Wed 06:20 Midway, Chicago (MDW) 09:15 Philadelphia (PHL) E
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 1:55 Effective 2025-06-10 through 2025-07-30
Sun 13:25 Midway, Chicago (MDW) 16:20 Philadelphia (PHL) E
WN 3878 Non-stop Boeing 737-700 (73W) 1:55 Effective 2025-06-08 through 2025-08-03
Tue,Wed 13:25 Midway, Chicago (MDW) 15:45 Pittsburgh (PIT)
WN 3878 Non-stop Boeing 737-800 (73H) 1:20 Effective 2025-10-07 through 2025-10-29
Sun 16:25 Los Angeles (LAX) 1 21:10 San Antonio (SAT) A
WN 3878 Non-stop Boeing 737-800 (73H) 2:45 Operates only on 2025-11-30
Fri 17:35 Midway, Chicago (MDW) 20:35 Philadelphia (PHL) E
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 2:00 Operates only on 2025-07-04
Sat 17:35 Midway, Chicago (MDW) 19:55 Pittsburgh (PIT)
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 1:20 Effective 2025-10-04 through 2025-11-01
Sun 17:55 Midway, Chicago (MDW) 20:15 Pittsburgh (PIT)
WN 3878 Non-stop Boeing 737-700 (Scimitar Winglets) 1:20 Effective 2025-10-05 through 2025-10-26
Mon,Thu,Fri 18:30 Midway, Chicago (MDW) 20:50 Pittsburgh (PIT)
WN 3878 Non-stop Boeing 737-700 (Scimitar Winglets) 1:20 Effective 2025-10-02 through 2025-10-31
Sat 19:05 Midway, Chicago (MDW) 22:00 Philadelphia (PHL) E
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 1:55 Effective 2025-06-07 through 2025-08-02
Sun 20:20 Houston Hobby (HOU) 23:20 Atlanta (ATL) N
WN 3878 Non-stop Boeing 737-700 (73W) 2:00 Effective 2025-08-10 through 2025-08-24
Sun 20:20 Houston Hobby (HOU) 23:20 Atlanta (ATL) N
WN 3878 Non-stop Boeing 737-700 (73W) 2:00 Effective 2025-09-07 through 2025-09-28
Tue,Wed,Sat 22:40 Las Vegas Harry Reid (LAS) 1 01:25 Seattle-Tacoma (SEA)
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 2:45 Effective 2025-11-22 through 2025-11-29
The flight arrives 1 day after departure.
Mon 22:40 Las Vegas Harry Reid (LAS) 1 01:25 Seattle-Tacoma (SEA)
WN 3878 Non-stop Boeing 737 MAX 8 (7M8) 2:45 Operates only on 2025-12-01
The flight arrives 1 day after departure.
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 Effective 2025-12-19 through 2026-01-04
The flight arrives 1 day after departure.
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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
06:20
Midway, Chicago (MDW)

09:15
Philadelphia (PHL) E
Effective 2025-06-10 through 2025-07-30
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:55, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3878
13:25
Midway, Chicago (MDW)

16:20
Philadelphia (PHL) E
Effective 2025-06-08 through 2025-08-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:55, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3878
13:25
Midway, Chicago (MDW)

15:45
Pittsburgh (PIT)
Effective 2025-10-07 through 2025-10-29
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:20, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3878
16:25
Los Angeles (LAX) 1

21:10
San Antonio (SAT) A
Operates only on 2025-11-30
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:45, non-stop
Boeing 737-800 (73H)
Southwest Airlines WN3878
17:35
Midway, Chicago (MDW)

20:35
Philadelphia (PHL) E
Operates only on 2025-07-04
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Duration: 2:00, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3878
17:35
Midway, Chicago (MDW)

19:55
Pittsburgh (PIT)
Effective 2025-10-04 through 2025-11-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:20, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3878
17:55
Midway, Chicago (MDW)

20:15
Pittsburgh (PIT)
Effective 2025-10-05 through 2025-10-26
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:20, non-stop
Boeing 737-700 (Scimitar Winglets)
Southwest Airlines WN3878
18:30
Midway, Chicago (MDW)

20:50
Pittsburgh (PIT)
Effective 2025-10-02 through 2025-10-31
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 1:20, non-stop
Boeing 737-700 (Scimitar Winglets)
Southwest Airlines WN3878
19:05
Midway, Chicago (MDW)

22:00
Philadelphia (PHL) E
Effective 2025-06-07 through 2025-08-02
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:55, non-stop
Boeing 737 MAX 8 (7M8)
Southwest Airlines WN3878
20:20
Houston Hobby (HOU)

23:20
Atlanta (ATL) N
Effective 2025-08-10 through 2025-08-24
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:00, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3878
20:20
Houston Hobby (HOU)

23:20
Atlanta (ATL) N
Effective 2025-09-07 through 2025-09-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:00, non-stop
Boeing 737-700 (73W)
Southwest Airlines WN3878
22:40
Las Vegas Harry Reid (LAS) 1

01:25(+1)
Seattle-Tacoma (SEA)
Effective 2025-11-22 through 2025-11-29
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:45, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Southwest Airlines WN3878
22:40
Las Vegas Harry Reid (LAS) 1

01:25(+1)
Seattle-Tacoma (SEA)
Operates only on 2025-12-01
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:45, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.
Southwest Airlines WN3878
22:40
Las Vegas Harry Reid (LAS) 1

01:25(+1)
Seattle-Tacoma (SEA)
Effective 2025-12-19 through 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.
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This flight number is listed as serving the following routes:
  • Houston Hobby (HOU) - Atlanta (ATL)
  • Las Vegas Harry Reid (LAS) - Seattle-Tacoma (SEA)
  • Los Angeles (LAX) - San Antonio (SAT)
  • Midway, Chicago (MDW) - Philadelphia (PHL)
  • Midway, Chicago (MDW) - Pittsburgh (PIT)
All Southwest Airlines flights
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