Ontario → Seattle flights
Last observed price · Last checked: 24 Aug 2026 · Price may change
Short answer
Alaska Airlines flies Ontario to Seattle non-stop. The lowest fare our own searches returned is €96, seen on 24 Aug 2026. The average across the fares we caught is €188. October 2026 is the cheapest month in our observations, at €96. These are prices our searches returned on the dates shown, not quotes; run a live search for today's fare.
Tickets found in the last 7 days
The lowest fares our queries caught, cheapest first.
Starting prices by month
The lowest fare our queries observed in each month. Open a month to see its days; click a day with no price and we will search it for you.
Route facts
Frequently asked
Are there direct flights from Ontario to Seattle?+−
Yes. We have seen non-stop flights on this route, flown by Alaska Airlines.
How much is a flight from Ontario to Seattle?+−
The lowest fare we have observed is €96, found on 24 Aug 2026. Prices move, so read it as a floor rather than a quote.
Which airlines fly from Ontario to Seattle?+−
These are the carriers we have seen on the route: Alaska Airlines.
When is the cheapest month to fly from Ontario to Seattle?+−
In our observations October 2026 is the cheapest month so far, at €96.
Similar routes
More routes from Ontario
More routes to Seattle
Last checked: 24 Aug 2026