Cheap flights from Ontario to Seattle from C$ 216

If you aren’t able to travel to Seattle during the month of February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of C$ 388.

Our data shows that Thursday is the least expensive day to fly to Seattle. Tickets to fly out on this day can be as low as C$ 525. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around C$ 885. These prices are subject to change though, so be sure to set up a Price Alert for flights to Seattle.

Our most recent data shows that the best time of day to fly to Seattle is in the evening. Flights from Region of Ontario to Seattle during this time can be as low as C$ 507. Flights in the morning are often more expensive with an average ticket price of C$ 1,290.

Fly from Toronto Pearson Intl to Seattle/Tacoma Intl for the best Ontario - Seattle/Tacoma Intl flight prices

You are more likely to see cheaper flights to Seattle from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around C$ 511 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Region of Ontario for as low as C$ 410 on momondo.

There are 4 cabin classes available to choose from on Region of Ontario to Seattle flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

WestJet, Air Canada, and United Airlines are the most popular carriers operating from Ontario to Seattle/Tacoma Intl

Alaska Airlines, Air Canada and WestJet are the top three most popular airlines that fly to Seattle from Region of Ontario according to our data. Alaska Airlines is the first choice among our users, with 32% of people opting to fly with this airline when travelling to Seattle. Keep in mind that there are 5 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

The number of flights available between Region of Ontario and Seattle is 1 per day as of August 2026. The most frequent departure time is 6:00p.m., with 85% of daily flights leaving in the evening.

The number of flights available between Region of Ontario and Seattle is 13 per week as of August 2026. The most frequent departure day is Sat, with 23% of weekly flights leaving on this day.