$138 Cheap Delta flights Seattle (SEA) to Toronto (YYZ)

Apply the “Price (lowest to highest)” filter on Expedia to find cheap Delta Air Lines round-trip flights from $291 from SEA to YYZ. Affordable one-way fares from $138 are also on offer.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Browse for return or one-way flights to Toronto in January or February. You could find a cheap fare with Delta Air Lines during these off-peak travel months.

To discover affordable flights from SEA to YYZ with Delta Air Lines, start searching about one month before your intended departure. You can save 17% when you lock in your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Another good tip? Booking on Sunday can lead to average savings of 17% compared to Friday (the most expensive day).**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Enter your dates, press search and check the “Nonstop” filter on Expedia to browse any direct flights from SEA to YYZ with Delta Air Lines or another airline.

Sort your results by “Early Morning” and “Morning” to see the earliest flights from SEA to YYZ. Heading off early means you’re 20% less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Pearson Intl. Airport (YYZ) is the main Toronto gateway for Delta Air Lines flights from Seattle - Tacoma Intl. Airport (SEA).

Offering a rewarding loyalty program and an excellent in-flight experience, Delta Air Lines is a favorite for many travelers heading from SEA to YYZ. What’s more, if you’re a Delta SkyMiles and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can be put toward future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on the type of fare you purchased, a fee will generally apply if you change or cancel your booking more than 24 hours after it’s been confirmed. To secure flexible fares, select our “Changes included” and “No cancel fee” boxes when looking for flights. To learn more about changing or canceling your reservation, head to “Trips,” select your flight and click on “Manage Booking.”