Cheap flights from Seattle, WA to Ontario, United States (SEA - ONT)

As a rule, buying flight tickets from Seattle, WA to Ontario expends a lot. Using our service of searching for cheap flight tickets, you will be able to save a significant sum of money! We will help tip to buy flight tickets from Seattle, WA to Ontario at the most favorable prices.

Out service helps you to find tickets from Seattle, WA to Ontario in the most reliable travel agencies and booking systems, including all the airline companies. We don't sell tickets and don't do any surcharges, we just find the best offers - you choose yourself where you want to buy flight tickets Seattle, WA - Ontario at the best price!

We also recommend you to look through the prices for return tickets from Ontario to Seattle, WA.

Airfares found by our users in the past 24 hours

The cheapest flight from Seattle, WA to Ontario is $93 on Frontier Airlines, departing on 29.04.2025 and returning on 04.05.2025.
The price for these dates could change. Use search to get the best price.
AirlineDeparture dateReturn datePrice
Frontier Airlines29.04.202504.05.2025from $93

Average round-trip airfares from Seattle, WA to Ontario by months

MonthRound-Trip
March 202526.03 - 02.04from $142
April 202529.04 - 04.05from $93
May 2025find now
June 2025find now
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August 2025find now
September 202516.09 - 23.09from $226
October 2025find now
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February 2026find now

The price which were found by our clients for the latest several days. Given ticket prices could change. It's connected with the presence of flight tickets while booking.

Airlines are flying from Seattle, WA to Ontario

American Airlines
Find Flights to Ontario