Cheap Flights from Seattle to Toronto from US$136

Frequently Asked Questions

• What are the cheapest flights from Seattle to Toronto (SEA-YTO)?

  Based on Trip.com data, WestJet offers one-way fares as low as US$136 on Cheapest nonstop routes (e.g. SEA to YYZ on Fri, Oct 23), while WestJet offers Cheapest nonstop round-trips from US$315 departing on Tue, Oct 13 and returning on Sun, Oct 18.

• Which airlines offer direct flights from Seattle to Toronto?

  At the moment, you can catch a nonstop flight from Seattle to Toronto with the following airlines, including: Alaska Airlines Delta Air Lines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• How long is a flight from Seattle to Toronto?

  It takes about 4 hours 42 minutes to fly from Seattle to Toronto.

• When is the best time to book flights from Seattle to Toronto?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Seattle to Toronto is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• How many flights are there per week from Seattle to Toronto?

  Based on Trip.com data in the past 4 weeks, there is 14 flight per week flying from Seattle to Toronto. You can check the weekly schedule for popular airlines on this route below: Alaska Airlines: S/M/T/W/T/F/S -- AS385 (08:18)

• How can I find the best deals on flights from Seattle to Toronto?

  To find best deals on flights from Seattle to Toronto, you can use various tools on Trip.com:
  · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Fri, Oct 23, with one-way flights priced at just US$136.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Alaska Airlines.
  · Set up price alerts to easily monitor ticket prices without having to check every day.
  · Check Trip.com flight deals and promo codes frequently.
  · Avoid peak season unless you book very early. It seems the peak season for Toronto travel is around January.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from Seattle (SEA) to Toronto (YTO) the cheapest?

  The cheapest months to fly from Seattle to Toronto is September, when demand for travel is lower.

• Which upcoming date is cheapest to fly from Seattle to Toronto on?

  After crunching the numbers on our October flight calendar, it's currently cheapest to fly from Seattle to Toronto on October 11, 2026 with WestJet, with prices starting at US$148.

• Which airports fly into Toronto from Seattle?

  You can land at any one of the following hubs in Toronto: John C. Munro Hamilton International Airport (YHM), Region of Waterloo International Airport (YKF), Billy Bishop Toronto City Airport (YTZ), and Toronto Pearson International Airport (YYZ). Flying from Seattle-Tacoma International Airport to Toronto Pearson International Airport (SEA-YYZ) is by far the most common option on this route.

• Is there any time difference between Seattle and Toronto?

  The time difference between Toronto and Seattle is 3h.

• How do I change or cancel my ticket from Seattle to Toronto?

  Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

• What is the average cost of a one-way flight from Seattle to Toronto?

  Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from Seattle to Toronto is US$341. Fares vary by travel date, airline and availability.

• What is the average cost of a round-trip flight from Seattle to Toronto?

  Based on Trip.com data for travel in the next 30 days, the average round-trip fare from Seattle to Toronto is US$599. The final price depends on the outbound and return dates, airline and fare conditions.

• How do I book flights from Seattle to Toronto on Trip.com?

  Enter Seattle and Toronto, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveler details and complete payment to receive your confirmation.

• Are there budget airlines on the Seattle to Toronto route?

  WestJetare the most popular budget airlines flying from Seattle to Toronto. Check baggage, seat and payment fees before comparing the final price.