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* All fares below were last found on: Jun 21, 2018 and 7:20:08 PM. Fares are round trip, Fares incl. all fuel surcharges, our service fees and taxes. Displayed fares are based on historical data, are subject to change and cannot be guaranteed at the time of booking. See all booking terms and conditions

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Sky High Flight Facts for Your Trip: Ontario to Seattle

Find affordable air fare deals from Ontario (ONT) to Seattle (SEA) and jet set for a memorable vacation without breaking the bank! Book Seattle flights on OneTravel offering exclusive airfare deals featuring the most traveled routes.


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  • When does the earliest flight depart ONT? 6:02AM Alaska Airlines Flight #545
  • When does the latest flight depart SEA? 6:09PM Alaska Airlines Flight #483
  • Which is the busiest month to travel from Ontario to Seattle?April
  • Which is the least busy month to travel from ONT to SEA?September
  • What is the travel distance between Ontario to Seattle?1,665 miles
  • How many weekly flights are there are between ONT to SEA? There are 2 weekly flights between ONT and SEA.
  • Which is the busiest day in terms of passengers flying from ONT to SEA?Thursday
  • In last 30 days, what is the %age of SEA visitors who spent less than 3 days in the city?83.33 %
  • Name the airport nearby SEA? Kenmore Air Harbor
  • Name the airports nearby ONT? Ogoki Post Airport