Cheap flights from Seattle to Ontario
From 154 USD — compare hundreds of airlines
About this route
Compare flights from Seattle to Ontario, a about 1,557 km route (around 2h 27m nonstop). We gather live prices from hundreds of airlines and agencies so you can find the cheapest and book on the official site, with no hidden fees. Direct flights are available. Airlines such as American Airlines, Alaska Airlines operate this route.
Prices by date
Airlines on this route
FAQ
What's the cheapest month to fly Seattle to Ontario?
It's usually 2026-07, from 188 USD. Use the price calendar to compare other dates.
How long is the flight from Seattle to Ontario?
A nonstop flight takes about 2h 27m and covers around 1,557 km. Connecting itineraries take longer.
Are there direct flights from Seattle to Ontario?
Yes, this route has nonstop flights. Filter by "nonstop" to see them.
Which airlines fly from Seattle to Ontario?
American Airlines, Alaska Airlines operate this route, among others. Compare them all in the results.
When should I book Seattle–Ontario flights?
As a rule of thumb, booking 3–8 weeks ahead and avoiding weekends and holidays tends to give the best prices. Use the calendar to spot the cheapest dates.