# Seattle to Ontario flights

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

## About this route

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

- Route distance: 1,557 km
- Fastest observed flight time: 2h 34m
- Airlines seen: Alaska Airlines, Delta Air Lines, Frontier Airlines, Southwest Airlines, United Airlines
- Alternative airports: BFI

- No recently checked fare for this route.

## Frequently asked

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

The lowest fare Routavio has observed is €81, found on 5 Nov 2026.

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

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

### Which airlines fly from Seattle to Ontario?

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 Seattle to Ontario take?

Across the 75 fares Routavio observed, the average journey time is 10h 02m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.

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

4 of the 80 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 12 November 2026