Flights
Flights from Seattle to Ontario
Compare live fares from Seattle to Ontario and book in a few steps.
Recent fares from Seattle to Ontario
Airlines that fly nonstop from Seattle to Ontario
Alaska AirlinesSEA to ONTLast seen November 3, 2026
Where to stay in Ontario
Compare hotel prices in Ontario and book your stay with the same account.
Questions about flights from Seattle to Ontario
Yes. In the last 30 days, our searches found nonstop flights on this route with Alaska Airlines.
On most airlines you can pick your seat on the plane map and add bags during checkout, with every price shown before you pay.