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

As a rule, buying flight tickets from Ontario to Seattle, WA 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 Ontario to Seattle, WA at the most favorable prices.

Out service helps you to find tickets from Ontario to Seattle, WA 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 Ontario - Seattle, WA at the best price!

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

Airfares found by our users in the past 24 hours

The cheapest flight from Ontario to Seattle, WA is $139 on Frontier Airlines, departing on 27.03.2025 and returning on 30.03.2025.
The price for these dates could change. Use search to get the best price.
AirlineDeparture dateReturn datePrice
Frontier Airlines27.03.202530.03.2025from $139

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

MonthRound-Trip
February 2025find now
March 202527.03 - 30.03from $139
April 202512.04 - 15.04from $252
May 2025find now
June 2025find now
July 2025find now
August 202504.08 - 23.08from $230
September 2025find now
October 2025find now
November 202526.11 - 29.11from $349
December 2025find now
January 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 Ontario to Seattle, WA

American Airlines
Find Flights to Seattle, WA
PrevNext
March 2025
MOTUWETHFRSASU
     12
3456789
10111213141516
17181920212223
24252627282930
31