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Book Flights from Ontario to Seattle will help you to find the best deals on flights from Ontario to Seattle. With our search technology, effortlessly searching flight routes across hundreds of airlines has never been easier or more convenient. With, we aim to make it simple and quick to search, select and save on the flights that best suit your needs and budget.

No matter if you are traveling for business or pleasure, we offer a wide range of deals from business class discounts to last minute flight deals to destinations like Seattle. Whether you are planning ahead or looking for last minute tickets, CheapOair has the right flights at the right price. After booking your ticket, explore this page to view blog posts about this destination, learn more about hotels near SEA and read reviews from others who booked their flights with

Frequently Asked Questions - Ontario to Seattle Flights

  • When does the first flight of the day depart from ONT?

    6:00AM Alaska Airlines Flight #924

  • When does the last flight depart to SEA?

    5:45PM Alaska Airlines Flight #615

  • What is the travel distance between Ontario and Seattle?

    1,665 miles

  • How many weekly flights are there between ONT to SEA?

    There are 13 weekly flights between ONT and SEA.

  • How many daily flights fly between Ontario and Seattle?

    There are 1 daily flights between ONT and SEA

  • Which is the busiest day in terms of passengers traffic between ONT to SEA?


  • Which is the nearest airport to Seattle, Washington?

    Kenmore Air Harbor

  • Which is the nearest airport to Ontario, California?

    Ogoki Post Airport