Southwest Airlines flight WN 3521: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Tue,Wed 06:05 Sacramento (SMF) B 07:35 Los Angeles (LAX) 1
WN 3521 Non-stop Boeing 737-700 (Scimitar Winglets) 1:30 Effective 2026-06-09 through 2026-07-29
Tue,Wed 08:10 Los Angeles (LAX) 1 09:35 Phoenix Sky Harbor (PHX) 4
WN 3521 Non-stop Boeing 737-700 (Scimitar Winglets) 1:25 Effective 2026-06-09 through 2026-07-29
Tue,Wed 08:20 Las Vegas Harry Reid (LAS) 1 15:50 Baltimore (BWI)
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 4:30 Effective 2026-03-10 through 2026-04-01
Sat 10:10 Chicago Midway (MDW) 12:40 Seattle-Tacoma (SEA)
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 4:30 Effective 2026-04-11 through 2026-05-30
Tue,Wed,Sun 10:15 Chicago Midway (MDW) 12:45 Seattle-Tacoma (SEA)
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 4:30 Effective 2026-04-07 through 2026-05-20
Tue,Wed,Sun 10:15 Chicago Midway (MDW) 12:45 Seattle-Tacoma (SEA)
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 4:30 Effective 2026-05-26 through 2026-06-03
Mon,Thu,Fri 10:35 Chicago Midway (MDW) 13:05 Seattle-Tacoma (SEA)
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 4:30 Effective 2026-04-09 through 2026-06-01
Sat 10:35 Tampa (TPA) 12:05 Atlanta (ATL) N
WN 3521 Non-stop Boeing 737-700 (Scimitar Winglets) 1:30 Effective 2026-06-06 through 2026-08-01
Sun 11:15 Chicago Midway (MDW) 13:45 Seattle-Tacoma (SEA)
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 4:30 Operates only on 2026-05-24
Sat 12:40 Atlanta (ATL) N 13:50 Houston Hobby (HOU)
WN 3521 Non-stop Boeing 737-700 (Scimitar Winglets) 2:10 Effective 2026-06-06 through 2026-08-01
Sun 13:25 Seattle-Tacoma (SEA) 16:05 Las Vegas Harry Reid (LAS) 1
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 2:40 Effective 2026-04-12 through 2026-05-17
Sun 13:25 Seattle-Tacoma (SEA) 16:05 Las Vegas Harry Reid (LAS) 1
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 2:40 Operates only on 2026-05-31
Mon,Thu,Fri 14:50 Saint Louis (STL) 2 16:35 Panama City (ECP)
WN 3521 Non-stop Boeing 737-700 (Scimitar Winglets) 1:45 Effective 2026-08-06 through 2026-09-28
Sun 16:45 West Palm Beach (PBI) 19:20 Baltimore (BWI)
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 2:35 Effective 2026-03-08 through 2026-04-05
Sun 16:45 Las Vegas Harry Reid (LAS) 1 17:50 Ontario, Los Angeles (ONT) 4
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 1:05 Effective 2026-04-12 through 2026-05-17
Sun 16:45 Las Vegas Harry Reid (LAS) 1 17:50 Ontario, Los Angeles (ONT) 4
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 1:05 Operates only on 2026-05-31
Tue,Wed 17:00 Sarasota/Bradenton (SRQ) 17:55 Orlando (MCO)
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 0:55 Effective 2026-08-04 through 2026-09-30
Sat 18:30 Tampa (TPA) 21:15 Los Angeles (LAX) 1
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 5:45 Effective 2026-02-14 through 2026-02-28
Sun 18:45 Chicago Midway (MDW) 22:00 Boston Logan (BOS) B
WN 3521 Non-stop Boeing 737-800 (73H) 2:15 Effective 2026-06-07 through 2026-08-02
Sat 20:30 Kansas City (MCI) 21:35 Las Vegas Harry Reid (LAS) 1
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 3:05 Valid until 2026-01-03
Mon 22:05 Kansas City (MCI) 23:10 Las Vegas Harry Reid (LAS) 1
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 3:05 Operates only on 2026-01-05
Mon,Tue,Fri,Sun 22:10 Kansas City (MCI) 23:15 Las Vegas Harry Reid (LAS) 1
WN 3521 Non-stop Boeing 737 MAX 8 (7M8) 3:05 Valid until 2026-01-04
Non-Direct Flights:
Tue,Wed 06:05 Sacramento (SMF) B 09:35 Phoenix Sky Harbor (PHX) 4
WN 3521 1-stop Boeing 737-700 (Scimitar Winglets) 3:30 Effective 2026-06-09 through 2026-07-29
Sun 10:15 Chicago Midway (MDW) 16:05 Las Vegas Harry Reid (LAS) 1
WN 3521 1-stop Boeing 737 MAX 8 (7M8) 7:50 Effective 2026-04-12 through 2026-05-17
Sun 10:15 Chicago Midway (MDW) 16:05 Las Vegas Harry Reid (LAS) 1
WN 3521 1-stop Boeing 737 MAX 8 (7M8) 7:50 Operates only on 2026-05-31
Sat 10:35 Tampa (TPA) 13:50 Houston Hobby (HOU)
WN 3521 1-stop Boeing 737-700 (Scimitar Winglets) 4:15 Effective 2026-06-06 through 2026-08-01
Sun 13:25 Seattle-Tacoma (SEA) 17:50 Ontario, Los Angeles (ONT) 4
WN 3521 1-stop Boeing 737 MAX 8 (7M8) 4:25 Effective 2026-04-12 through 2026-05-17
Sun 13:25 Seattle-Tacoma (SEA) 17:50 Ontario, Los Angeles (ONT) 4
WN 3521 1-stop Boeing 737 MAX 8 (7M8) 4:25 Operates only on 2026-05-31
Sun 10:15 Chicago Midway (MDW) 17:50 Ontario, Los Angeles (ONT) 4
WN 3521 2-stop Boeing 737 MAX 8 (7M8) 9:35 Effective 2026-04-12 through 2026-05-17
Sun 10:15 Chicago Midway (MDW) 17:50 Ontario, Los Angeles (ONT) 4
WN 3521 2-stop Boeing 737 MAX 8 (7M8) 9:35 Operates only on 2026-05-31
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This flight number is listed as serving the following routes:


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Southwest Airlines flight WN 3521: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Southwest Airlines WN3521
06:05
Sacramento (SMF) B

07:35
Los Angeles (LAX) 1
Effective 2026-06-09 through 2026-07-29
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:30, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3521
08:10
Los Angeles (LAX) 1

09:35
Phoenix Sky Harbor (PHX) 4
Effective 2026-06-09 through 2026-07-29
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:25, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3521
08:20
Las Vegas Harry Reid (LAS) 1

15:50
Baltimore (BWI)
Effective 2026-03-10 through 2026-04-01
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 4:30, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
10:10
Chicago Midway (MDW)

12:40
Seattle-Tacoma (SEA)
Effective 2026-04-11 through 2026-05-30
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 4:30, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
10:15
Chicago Midway (MDW)

12:45
Seattle-Tacoma (SEA)
Effective 2026-04-07 through 2026-05-20
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
Duration: 4:30, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
10:15
Chicago Midway (MDW)

12:45
Seattle-Tacoma (SEA)
Effective 2026-05-26 through 2026-06-03
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
Duration: 4:30, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
10:35
Chicago Midway (MDW)

13:05
Seattle-Tacoma (SEA)
Effective 2026-04-09 through 2026-06-01
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 4:30, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
10:35
Tampa (TPA)

12:05
Atlanta (ATL) N
Effective 2026-06-06 through 2026-08-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:30, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3521
11:15
Chicago Midway (MDW)

13:45
Seattle-Tacoma (SEA)
Operates only on 2026-05-24
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 4:30, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
12:40
Atlanta (ATL) N

13:50
Houston Hobby (HOU)
Effective 2026-06-06 through 2026-08-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:10, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3521
13:25
Seattle-Tacoma (SEA)

16:05
Las Vegas Harry Reid (LAS) 1
Effective 2026-04-12 through 2026-05-17
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:40, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
13:25
Seattle-Tacoma (SEA)

16:05
Las Vegas Harry Reid (LAS) 1
Operates only on 2026-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:40, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
14:50
Saint Louis (STL) 2

16:35
Panama City (ECP)
Effective 2026-08-06 through 2026-09-28
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 1:45, non-stop
Boeing 737-700 (Scimitar Winglets)
Direct Flights:
Southwest Airlines WN3521
16:45
West Palm Beach (PBI)

19:20
Baltimore (BWI)
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 WN3521
16:45
Las Vegas Harry Reid (LAS) 1

17:50
Ontario, Los Angeles (ONT) 4
Effective 2026-04-12 through 2026-05-17
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:05, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
16:45
Las Vegas Harry Reid (LAS) 1

17:50
Ontario, Los Angeles (ONT) 4
Operates only on 2026-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:05, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
17:00
Sarasota/Bradenton (SRQ)

17:55
Orlando (MCO)
Effective 2026-08-04 through 2026-09-30
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 0:55, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
18:30
Tampa (TPA)

21:15
Los Angeles (LAX) 1
Effective 2026-02-14 through 2026-02-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 5:45, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
18:45
Chicago Midway (MDW)

22:00
Boston Logan (BOS) B
Effective 2026-06-07 through 2026-08-02
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 2:15, non-stop
Boeing 737-800 (73H)
Direct Flights:
Southwest Airlines WN3521
20:30
Kansas City (MCI)

21:35
Las Vegas Harry Reid (LAS) 1
Valid until 2026-01-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 3:05, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
22:05
Kansas City (MCI)

23:10
Las Vegas Harry Reid (LAS) 1
Operates only on 2026-01-05
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 3:05, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
Southwest Airlines WN3521
22:10
Kansas City (MCI)

23:15
Las Vegas Harry Reid (LAS) 1
Valid until 2026-01-04
Mon
Tue
Wed
-
Thu
-
Fri
Sat
-
Sun
Duration: 3:05, non-stop
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
Southwest Airlines WN3521
06:05
Sacramento (SMF) B

09:35
Phoenix Sky Harbor (PHX) 4
Effective 2026-06-09 through 2026-07-29
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 3:30, 1-stop
Boeing 737-700 (Scimitar Winglets)
Non-Direct Flights:
Southwest Airlines WN3521
10:15
Chicago Midway (MDW)

16:05
Las Vegas Harry Reid (LAS) 1
Effective 2026-04-12 through 2026-05-17
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 7:50, 1-stop
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
Southwest Airlines WN3521
10:15
Chicago Midway (MDW)

16:05
Las Vegas Harry Reid (LAS) 1
Operates only on 2026-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 7:50, 1-stop
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
Southwest Airlines WN3521
10:35
Tampa (TPA)

13:50
Houston Hobby (HOU)
Effective 2026-06-06 through 2026-08-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 4:15, 1-stop
Boeing 737-700 (Scimitar Winglets)
Non-Direct Flights:
Southwest Airlines WN3521
13:25
Seattle-Tacoma (SEA)

17:50
Ontario, Los Angeles (ONT) 4
Effective 2026-04-12 through 2026-05-17
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 4:25, 1-stop
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
Southwest Airlines WN3521
13:25
Seattle-Tacoma (SEA)

17:50
Ontario, Los Angeles (ONT) 4
Operates only on 2026-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 4:25, 1-stop
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
Southwest Airlines WN3521
10:15
Chicago Midway (MDW)

17:50
Ontario, Los Angeles (ONT) 4
Effective 2026-04-12 through 2026-05-17
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 9:35, 2-stop
Boeing 737 MAX 8 (7M8)
Non-Direct Flights:
Southwest Airlines WN3521
10:15
Chicago Midway (MDW)

17:50
Ontario, Los Angeles (ONT) 4
Operates only on 2026-05-31
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 9:35, 2-stop
Boeing 737 MAX 8 (7M8)
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This flight number is listed as serving the following routes:
  • Atlanta (ATL) - Houston Hobby (HOU)
  • Chicago Midway (MDW) - Boston Logan (BOS)
  • Chicago Midway (MDW) - Las Vegas Harry Reid (LAS)
  • Chicago Midway (MDW) - Ontario, Los Angeles (ONT)
  • Chicago Midway (MDW) - Seattle-Tacoma (SEA)
  • Kansas City (MCI) - Las Vegas Harry Reid (LAS)
  • Las Vegas Harry Reid (LAS) - Baltimore (BWI)
  • Las Vegas Harry Reid (LAS) - Ontario, Los Angeles (ONT)
  • Los Angeles (LAX) - Phoenix Sky Harbor (PHX)
  • Sacramento (SMF) - Los Angeles (LAX)
  • Sacramento (SMF) - Phoenix Sky Harbor (PHX)
  • Saint Louis (STL) - Panama City (ECP)
  • Sarasota/Bradenton (SRQ) - Orlando (MCO)
  • Seattle-Tacoma (SEA) - Las Vegas Harry Reid (LAS)
  • Seattle-Tacoma (SEA) - Ontario, Los Angeles (ONT)
  • Tampa (TPA) - Atlanta (ATL)
  • Tampa (TPA) - Houston Hobby (HOU)
  • Tampa (TPA) - Los Angeles (LAX)
  • West Palm Beach (PBI) - Baltimore (BWI)
All Southwest Airlines flights
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