Cheap flights from Toronto to Seattle from C$ 216

If you aren’t able to travel to Seattle during the month of December, then flying in April is also cheap. Prices for this month can be found on momondo for an average of C$ 127.

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$ 538. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around C$ 803. 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 Toronto to Seattle during this time can be as low as C$ 510. Flights in the morning are often more expensive with an average ticket price of C$ 914.

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

You are more likely to see cheaper flights to Seattle from Toronto when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around C$ 468 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Toronto for as low as C$ 375 on momondo.

You could potentially save up to 20% on your flight if you consider stops on a Toronto to Seattle flight.

As of May 2026, prices for Toronto to Seattle flights are approximately 15% cheaper when compared to flights at the same time last year.

Alaska Airlines, WestJet, and United Airlines are the most popular carriers operating from Toronto to Seattle/Tacoma Intl

Alaska Airlines, Air Canada and WestJet are the top three most popular airlines that fly to Seattle from Toronto according to our data. Alaska Airlines is the first choice among our users, with 41% of people opting to fly with this airline when travelling to Seattle. Keep in mind that there are 6 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

Historically, on average around 27% of flights between Toronto and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 154 minutes.

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights departing in the evening have, in the past, seen delays more frequently in comparison.

Wednesday is statistically the day of the week that experiences the fewest delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

According to our data, Alaska Airlines has had the least delays on this route over the last 12 months, with about 17% of their flights experiencing any sort of delay.

Calgary (YYC) was the most common stop: 72% of momondo users choosing one-stop flights on this route connected there.

Flights via Calgary (YYC) offer the lowest average round-trip price of C$ 392.

Flights connecting via Vancouver (YVR) have the shortest average one-way travel time: 8h 01m.

Montreal (YUL) has the shortest average layover time for this route: 1h 22m.

The number of flights available between Toronto and Seattle is 3 per day as of May 2026. The most frequent departure time is 6:00p.m., with 81% of daily flights leaving in the evening.

As of May 2026, 21 flights take off from Toronto and land in Seattle each week. The most common flight departure day for this route is Mon, with 19% of weekly flights taking off on this day.