# Ontario to Seattle flights

Page: https://www.routavio.com/flights/ontario-to-seattle

## About this route

Explore the fares we observed from Ontario to Seattle. Prices move often, so pick your dates to see the latest options.

- Route distance: 1,557 km
- Fastest observed flight time: 2h 41m
- Airlines seen: Alaska Airlines, Delta Air Lines, Frontier Airlines, Southwest Airlines, United Airlines
- Alternative airports: BFI

- Cheapest checked fare: €80 one way (checked 5 Nov 2026, departing 5 Jan 2027)

## Frequently asked

### How much is a flight from Ontario to Seattle?

The lowest fare Routavio has observed is €80, found on 5 Nov 2026.

### Are there direct flights from Ontario to Seattle?

Yes. Published schedules report non-stop flights on this route with Alaska Airlines, Delta Air Lines, Frontier Airlines.

### Which airlines fly from Ontario to Seattle?

Routavio has seen these carriers on the route: Alaska Airlines, Delta Air Lines, Frontier Airlines, Southwest Airlines, United Airlines.

### How long does the flight from Ontario to Seattle take?

Across the 76 fares Routavio observed, the average journey time is 8h 32m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.

### How many of the observed Ontario to Seattle fares were non-stop?

3 of the 82 fares we observed were non-stop; the rest included at least one stop. That describes our observations, not every flight that operates.

Route data last updated by Routavio on 6 November 2026