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Book Flights from Seattle to Ontario will help you to find the best deals on flights from Seattle to Ontario. 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 Ontario. 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 ONT and read reviews from others who booked their flights with

Frequently Asked Questions - Seattle to Ontario Flights

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

    5:00AM Alaska Airlines Flight #980

  • When does the last flight depart to ONT?

    8:55PM Alaska Airlines Flight #546

  • What is the travel distance between Seattle and Ontario?

    1,665 miles

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

    There are 24 weekly flights between SEA and ONT.

  • How many daily flights fly between Seattle and Ontario?

    There are 3 daily flights between SEA and ONT

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


  • Which is the nearest airport to Ontario, California?

    Ogoki Post Airport

  • Which is the nearest airport to Seattle, Washington?

    Kenmore Air Harbor