Cheap flights from Seattle to Toronto Islands

View AU$189 flight on Fri, 22 Aug. 2025Opens in a new window

Popular airlines from Seattle to Toronto Islands

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Cheap Flights from Seattle (SEA) to Toronto Islands (YTO)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Fri, 22 Aug. - Mon, 1 Sep.
SEA
Seattle
YYZ
Toronto
AU$437 Return, found 1 hour ago
AU$437
Return
found 1 hour ago
Select Air Canada flight, departing Fri, 22 Aug. from Seattle to Toronto, returning Mon, 1 Sep., priced at AU$437 found 1 hour ago
Air Canada
Wed, 3 Sep. - Wed, 10 Sep.
SEA
Seattle
YYZ
Toronto
AU$459 Return, found 4 days ago
AU$459
Return
found 4 days ago
Select Air Canada flight, departing Wed, 3 Sep. from Seattle to Toronto, returning Wed, 10 Sep., priced at AU$459 found 4 days ago
United
Wed, 3 Sep. - Wed, 10 Sep.
SEA
Seattle
YYZ
Toronto
AU$459 Return, found 4 days ago
AU$459
Return
found 4 days ago
Select United flight, departing Wed, 3 Sep. from Seattle to Toronto, returning Wed, 10 Sep., priced at AU$459 found 4 days ago
WestJet
Fri, 22 Aug. - Mon, 1 Sep.
SEA
Seattle
YYZ
Toronto
AU$469 Return, found 1 hour ago
AU$469
Return
found 1 hour ago
Select WestJet flight, departing Fri, 22 Aug. from Seattle to Toronto, returning Mon, 1 Sep., priced at AU$469 found 1 hour ago
Alaska Airlines
Thu, 4 Sep. - Sun, 7 Sep.
SEA
Seattle
YYZ
Toronto
AU$489 Return, found 2 days ago
AU$489
Return
found 2 days ago
Select Alaska Airlines flight, departing Thu, 4 Sep. from Seattle to Toronto, returning Sun, 7 Sep., priced at AU$489 found 2 days ago
Delta
Thu, 21 Aug. - Sat, 13 Sep.
SEA
Seattle
YYZ
Toronto
AU$515 Return, found 1 day ago
AU$515
Return
found 1 day ago
Select Delta flight, departing Thu, 21 Aug. from Seattle to Toronto, returning Sat, 13 Sep., priced at AU$515 found 1 day ago

Find the cheapest month to fly from Seattle (SEA) to Toronto (YYZ)

January is typically the cheapest month to fly

From AU$345 - AU$877 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.