Book United Toronto to Seattle flight deals from $663

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Downtown Seattle at sunset

Plan ahead for flights from Toronto to Seattle

from
to
Type
Dates
Price*
Toronto (YYZ)
to Seattle (SEA)
Roundtrip
Depart Thu 25 Oct 2018
Return Sun 28 Oct 2018
from$ 663*Viewed: 1 hour ago
Toronto (YYZ)
to Seattle (SEA)
Roundtrip
Depart Mon 15 Oct 2018
Return Thu 18 Oct 2018
from$ 668*Viewed: 6 hours ago
Toronto (YYZ)
to Seattle (SEA)
Roundtrip
Depart Sun 6 Jan 2019
Return Fri 11 Jan 2019
from$ 742*Viewed: 2 hours ago
Toronto (YYZ)
to Seattle (SEA)
Roundtrip
Depart Fri 5 Oct 2018
Return Wed 10 Oct 2018
from$ 757*Viewed: 1 day ago
*Prices have been available for round trips within the last 48 hours and may not be currently available. Fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply.