Cheap flights from Toronto to Seattle from $157

In general, December is the cheapest month to fly from Toronto to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $91. If you don’t want to visit Seattle in December, then you should wait until April to fly from Toronto, when ticket prices are also cheap, with an average price of $93.

On average, the least expensive day to fly to Seattle from Toronto is on a Thursday. momondo users have found tickets for Thursday departures for as low as $431. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Toronto because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $524.

Flying to Seattle from Toronto in the evening is the least expensive time of day to depart. momondo users have found prices as low as $439 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $570. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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 $337 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 $292 on momondo.

You could potentially save up to 31% 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 28% cheaper when compared to flights at the same time last year.

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

Alaska Airlines, Air Canada and Delta 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 38% of people opting to fly with this airline when traveling 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 26% 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 155 minutes.

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

Tuesday is statistically the day of the week which experiences the fewest number of 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 have had the least number of delays on this route over the last 12 months; with about 16% of their flights experiencing any sort of delay.

Calgary (YYC) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Flights via Calgary (YYC) offer the lowest average round-trip price of $294.

Flights connecting via Vancouver (YVR) have the shortest average one-way travel time: 7h 55m.

Vancouver (YVR) has the shortest average layover time for this route: 1h 34m.

As of May 2026, 3 flights take off from Toronto and land in Seattle each day. The most common flight departure time for this route is 6:00PM, with 78% of daily flights taking off in the evening.

As of May 2026, there are 22 flights per week flying from Toronto to Seattle. The most common day of the week flights depart is Mon, with 18% of flights taking off on this day.