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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. Find affordable one-way or round-trip flights.

  • 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
        US$30US$58
        48% OFF
        48% OFF
        US$58US$30
      • ONT10:06
        2h 47m
        Direct
        SEA12:53
        Ontario - Seattle|Sat, Jun 1|Frontier Airlines
        US$30US$58
        48% OFF
        48% OFF
        US$58US$30
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Tue, May 21|Frontier Airlines
        US$30US$58
        47% OFF
        47% OFF
        US$58US$30
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Wed, May 22|Frontier Airlines
        US$30
        US$30
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Sat, May 18|Frontier Airlines
        US$31
        US$31
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Sat, May 25|Frontier Airlines
        US$36
        US$36
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Tue, May 28|Frontier Airlines
        US$36
        US$36
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Wed, May 29|Frontier Airlines
        US$39
        US$39
      • ONT10:04
        2h 53m
        Direct
        SEA12:57
        Ontario - Seattle|Wed, Jun 5|Frontier Airlines
        US$39
        US$39
      • ONT09:35
        2h 47m
        Direct
        SEA12:22
        Ontario - Seattle|Tue, Jul 16|Frontier Airlines
        US$39
        US$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

View airlines operating flights from Ontario International Airport to Seattle. Compare prices and find the airline that meets your travel needs to enjoy a comfortable journey.

Frontier Airlines
From US$30
Delta Air Lines
From US$57
Alaska Airlines
From US$61
United Airlines
From US$90
Southwest Airlines
From US$118
American Airlines
From US$244
Hawaiian Airlines
From US$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

$41

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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