Southwest Airlines flights from Ontario, Los Angeles (ONT) to Seattle-Tacoma (SEA).

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Select flight date:
FLIGHT SCHEDULE
Non-Direct Flights:
Mon,Thu,Fri 15:00 Ontario, Los Angeles (ONT) 4 20:05 Seattle-Tacoma (SEA)
Southwest Airlines WN 1474 1-stop Boeing 737-800 (73H) 5:05 Effective 2026-04-09 through 2026-06-01
Mon,Thu,Fri 19:30 Ontario, Los Angeles (ONT) 4 23:30 Seattle-Tacoma (SEA)
Southwest Airlines WN 3082 1-stop Boeing 737-700 (Scimitar Winglets) 4:00 Effective 2026-06-04 through 2026-08-03
Sun 12:45 Ontario, Los Angeles (ONT) 4 17:40 Seattle-Tacoma (SEA)
Southwest Airlines WN 3585 1-stop Boeing 737-700 (Scimitar Winglets) 4:55 Effective 2026-06-07 through 2026-08-02
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Parallax here ONT-SEA




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Southwest Airlines flights from Ontario, Los Angeles (ONT) to Seattle-Tacoma (SEA).
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Select flight date:
FLIGHT SCHEDULE
Non-Direct Flights:
Southwest Airlines WN1474
15:00
Ontario, Los Angeles (ONT) 4

20:05
Seattle-Tacoma (SEA)
Effective 2026-04-09 through 2026-06-01
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
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Duration: 5:05, 1-stop
Boeing 737-800 (73H)
Non-Direct Flights:
Southwest Airlines WN3082
19:30
Ontario, Los Angeles (ONT) 4

23:30
Seattle-Tacoma (SEA)
Effective 2026-06-04 through 2026-08-03
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 4:00, 1-stop
Boeing 737-700 (Scimitar Winglets)
Non-Direct Flights:
Southwest Airlines WN3585
12:45
Ontario, Los Angeles (ONT) 4

17:40
Seattle-Tacoma (SEA)
Effective 2026-06-07 through 2026-08-02
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 4:55, 1-stop
Boeing 737-700 (Scimitar Winglets)
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Parallax here ONT-SEA
  • A domestic route departing from the Ontario, Los Angeles airport (ONT) and arriving at Seattle-Tacoma airport (SEA).
  • The flight distance is 956 miles, or 1539 km.
  • The timezone of both the departure and the arrival airports is UTC-8 . Current time at both airports is (loading...).
All ONT-SEA flights
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