Airlines with flights from Seattle to Ontario

There are 6 airlines with scheduled flights between SEA and ONT. Delta, Alaska Airlines and Frontier has non-stop flights from Seattle Airport to Ontario International Airport and the flight time is 2 hours and 51 minutes.

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Schedules

Delta Air Lines

Non-stop with Delta Air Lines

  • Total flight time: 2 hours and 51 minutes
  • Sky Team Alliance
  • Seattle is a Delta Air Lines hub.
  • 32 flights per week
  • Embraer 175 (Enhanced Winglets)
  • First class available
SEA
Direct
ONT
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
DL4070
08:25
08:25
08:25
08:25
08:25
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08:30
DL4031
14:35
14:35
14:35
14:35
14:35
14:35
14:35
DL3884
19:50
19:50
19:50
19:50
19:50
19:50
19:50
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The timetable & schedule information was updated at 2026-04-22

Alaska Airlines

Non-stop with Alaska Airlines

  • Total flight time: 2 hours and 41 minutes
  • One World Alliance
  • Seattle is a Alaska Airlines hub (Primary hub).
  • 27 flights per week
  • Boeing 737-900 (winglets) Passenger/BBJ3
    Boeing 737MAX 8 Passenger
    Boeing 737-800 (winglets) Passenger/BBJ2
    Boeing 737MAX 9 Passenger
    Boeing 737-700 Passenger
  • Business and first class available
SEA
Direct
ONT
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
AS1364
08:33
08:33
08:33
08:33
08:33
08:33
08:30
AS565
10:25
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10:25
10:25
10:25
10:25
AS571
13:50
13:50
14:17
13:50
13:50
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13:50
AS592
17:51
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17:55
17:51
17:51
17:55
AS489
20:33
20:33
20:33
20:33
20:33
20:33
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SHOW RETURN SCHEDULE
CHECK PRICES FOR SEA - ONT

The timetable & schedule information was updated at 2026-04-22

Frontier Airlines

Non-stop with Frontier Airlines

  • Total flight time: 2 hours and 46 minutes
  • Low-cost airline
  • 12 flights per week
  • Airbus A321neo
SEA
Direct
ONT
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
F92276
11:53
11:53
11:53
11:53
11:53
11:53
11:53
SHOW RETURN SCHEDULE
CHECK PRICES FOR SEA - ONT

The timetable & schedule information was updated at 2026-04-22

Southwest Airlines

Via Sacramento with Southwest Airlines

  • Total flight time: 3h 45m - 6h 05m.
  • Low-cost airline
  • 81 flights per week
SEA
 
Via SMF
 
ONT
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
WN3629
WN3805
05:00
05:40
05:40
05:00
05:00
----
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WN3629
WN4911
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----
----
----
----
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05:00
WN3629
WN2261
----
----
----
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----
05:15
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WN3630
WN300
07:35
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----
07:35
07:35
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09:10
WN3212
WN3836
----
----
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----
11:10
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WN3231
WN480
----
----
----
----
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15:30
WN3566
WN4984
18:05
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----
18:05
18:05
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WN575
WN4984
----
----
----
----
----
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18:15
SHOW RETURN SCHEDULE
CHECK PRICES FOR SEA - ONT

The timetable & schedule information was updated at 2026-04-22

Alaska Airlines

Via Portland with Alaska Airlines

  • Total flight time: 3h 59m - 6h 16m.
  • One World Alliance
  • Seattle is a Alaska Airlines hub (Primary hub).
  • 169 flights per week
  • Boeing 737-900 (winglets) Passenger/BBJ3
    Boeing 737MAX 8 Passenger
    Boeing 737-800 (winglets) Passenger/BBJ2
    Boeing 737MAX 9 Passenger
    Boeing 737-700 Passenger
SEA
 
Via PDX
 
ONT
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
AS2181
AS2093
12:05
12:05
12:05
12:05
12:05
12:05
12:05
AS2302
AS97
17:59
17:59
17:59
17:59
17:59
17:59
17:59
AS2372
AS97
19:22
19:22
19:22
19:22
19:22
19:22
19:22
SHOW RETURN SCHEDULE
CHECK PRICES FOR SEA - ONT

The timetable & schedule information was updated at 2026-04-22

Southwest Airlines

Via San Jose with Southwest Airlines

  • Total flight time: 4h 10m - 6h 55m.
  • Low-cost airline
  • 50 flights per week
SEA
 
Via SJC
 
ONT
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
WN3626
WN3151
06:45
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----
06:45
06:45
07:30
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WN3983
WN3151
----
----
----
----
----
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06:55
WN2350
WN646
----
12:45
12:45
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WN336
WN2583
----
----
----
----
----
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12:45
WN4960
WN3691
13:30
----
----
13:30
13:30
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WN4130
WN646
----
15:25
15:25
----
----
----
----
WN615
WN3692
----
----
----
----
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17:15
18:50
SHOW RETURN SCHEDULE
CHECK PRICES FOR SEA - ONT

The timetable & schedule information was updated at 2026-04-22

Alaska Airlines

Via Boise with Alaska Airlines

  • Total flight time: 4h 13m - 6h 20m.
  • One World Alliance
  • Seattle is a Alaska Airlines hub (Primary hub).
  • 15 flights per week
  • Boeing 737-900 (winglets) Passenger/BBJ3
    Boeing 737MAX 8 Passenger
    Boeing 737-800 (winglets) Passenger/BBJ2
    Boeing 737MAX 9 Passenger
    Boeing 737-700 Passenger
SEA
 
Via BOI
 
ONT
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
AS2230
AS2025
09:59
09:59
----
09:59
09:59
----
09:59
AS428
AS2025
----
----
10:12
----
----
10:12
----
SHOW RETURN SCHEDULE
CHECK PRICES FOR SEA - ONT

The timetable & schedule information was updated at 2026-04-22

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Flight data on this page was last updated on 2026-06-02
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