Cheap flights from Seattle to Toronto (SEA to YYZ) from $307
Compare prices across airlines and find the best deals
Discover deals on Seattle to Toronto flights
Typical range $307-$607•Cheapest found $307
Updated recentlyCompare prices across airlines and find the best deals
Compare prices across airlines to find the best deal. Prices can vary significantly.
Flying midweek or in off-peak seasons can save you up to 30% on airfare.
Booking 6+ weeks in advance typically offers the best prices.
Airlines operating flights from Seattle to Toronto include American Airlines, WestJet, Alaska Airlines, Air Canada, Icelandair.
Book at the right time: For international flights, aim to book 6–10 weeks ahead. Last-minute fares on Seattle to Toronto are rarely cheap, and prices spike sharply within 2 weeks of departure.
Shift your dates by a day or two: Mid-week departures (Tuesday–Wednesday) are almost always cheaper than weekend flights. Even shifting by one day can make a meaningful difference.
Weigh up connecting flights: Connecting flights on Seattle to Toronto can be 20–40% cheaper than direct options. If you have time to spare, it's worth comparing.
Factor in baggage fees: Low-cost carriers on this route often advertise attractive base fares but charge separately for checked luggage. Always compare the all-in price — a $20 cheaper fare plus $50 baggage fee is no saving. American Airlines and WestJet may have different inclusions, so check each airline's fare conditions.
Search in private browsing: Some booking sites use cookies to track repeat searches and may show higher prices after multiple lookups. Use an incognito or private window — or just use Booked AI, which pulls live prices without any tracking markup.
Compare two one-ways against a return: On some international routes, booking a one-way with one airline and the return with another can undercut a standard return ticket — especially if a budget carrier covers one direction. Check both options with the flexible dates calendar above.
The cheapest flights from Seattle to Toronto start from $307, with typical prices ranging from $622 to $922.
The typical flight time from Seattle to Toronto is approximately 8 hours and 49 minutes.
Airlines operating this route include American Airlines, WestJet, Alaska Airlines, Air Canada, Icelandair.
Prices sourced via Duffel and updated regularly. All fares shown are indicative one-way prices in AUD and may vary at time of booking. Booked AI is an AI-powered travel platform.