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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 by: Lowest Price
  • Sort by: Lowest Price
  • Sort by: Earliest Flight
      • ONT09:35
        2h 47m
        Direct
        SEA12:22
        Ontario - Seattle|Tue, Jun 4|Frontier Airlines
        $30$58
        48% OFF
        48% OFF
        $58$30
      • ONT10:06
        2h 47m
        Direct
        SEA12:53
        Ontario - Seattle|Sat, Jun 1|Frontier Airlines
        $30$58
        48% OFF
        48% OFF
        $58$30
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Tue, May 21|Frontier Airlines
        $30$58
        47% OFF
        47% OFF
        $58$30
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Wed, May 22|Frontier Airlines
        $30
        $30
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Sat, May 18|Frontier Airlines
        $31
        $31
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Sat, May 25|Frontier Airlines
        $36
        $36
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Tue, May 28|Frontier Airlines
        $36
        $36
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Wed, May 29|Frontier Airlines
        $39
        $39
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Wed, Jun 5|Frontier Airlines
        $39
        $39
      • ONT09:35
        2h 47m
        Direct
        SEA12:22
        Ontario - Seattle|Tue, Jul 16|Frontier Airlines
        $39
        $39
      • 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 $30
Delta Air Lines
From $57
Alaska Airlines
From $61
United Airlines
From $90
Southwest Airlines
From $118
American Airlines
From $244
Hawaiian Airlines
From $592
ANA airlines
Find more flights and airlines

Flight Info of Flights from Ontario International Airport to Seattle

Cheapest round-trip ticket price

$89

Cheapest nonstop flight price

$35

Off-season for travel

May

Peak season for travel

October

FAQs for Ontario International Airport to Seattle Flights

  • What is the transportation method from the main airport to downtown in Seattle?

    • The distance from Seattle-Tacoma International Airport to downtown is about 17km. It takes about 30 minutes by taxi.

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