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Ontario International Airport to Seattle flight
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Cheap Flights from Ontario International Airport to Seattle

Search for flights from Ontario International Airport to Seattle and check out affordable one-way and round-trip options.

  • One way
  • Round-trip
sortSort: Price (Lowest)
  • Sort: Price (Lowest)
  • Sort: Departure (Earliest)
      • ONT09:35
        2h 47m
        Direct
        SEA12:22
        Ontario - Seattle|Tue, Jun 4|Frontier Airlines
        CAD 41CAD 79
        48% OFF
        48% OFF
        CAD 79CAD 41
      • ONT10:06
        2h 47m
        Direct
        SEA12:53
        Ontario - Seattle|Sat, Jun 1|Frontier Airlines
        CAD 41CAD 79
        47% OFF
        47% OFF
        CAD 79CAD 41
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Tue, May 21|Frontier Airlines
        CAD 41CAD 79
        47% OFF
        47% OFF
        CAD 79CAD 41
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Wed, May 22|Frontier Airlines
        CAD 41
        CAD 41
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Sat, May 18|Frontier Airlines
        CAD 42
        CAD 42
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Sat, May 25|Frontier Airlines
        CAD 49
        CAD 49
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Tue, May 28|Frontier Airlines
        CAD 49
        CAD 49
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Wed, May 29|Frontier Airlines
        CAD 53
        CAD 53
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Wed, Jun 5|Frontier Airlines
        CAD 53
        CAD 53
      • ONT09:35
        2h 47m
        Direct
        SEA12:22
        Ontario - Seattle|Tue, Jul 16|Frontier Airlines
        CAD 53
        CAD 53
      • ONT13:00
        3h 5m
        Direct
        SEA14:00
        Los Angeles - Seattle|Sun, May 5|Frontier Airlines
        Find More Flights
        Find More Flights

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

Selected Airlines from Ontario International Airport to Seattle

See which airlines fly from Ontario International Airport to Seattle. Find the airline that best meets your travel needs by comparing prices and treat yourself to an enjoyable journey.

Frontier Airlines
From CAD 41
Delta Air Lines
From CAD 78
Alaska Airlines
From CAD 83
United Airlines
From CAD 123
Southwest Airlines
From CAD 161
American Airlines
From CAD 333
Hawaiian Airlines
From CAD 808
ANA airlines
Find more flights and airlines

Flight Info of Flights from Ontario International Airport to Seattle

Cheapest return ticket price

CAD 121

Cheapest direct flight price

CAD 48

Cheapest month

May

Peak season for travel

October

FAQs for Ontario International Airport to Seattle Flights

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