CA $273 Cheap United fights from Washington (IAD) to Seattle (SEA)

View CA $273 flight on Tue, Oct. 14, 2025Opens in a new window

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United flights from Washington to Seattle (IAD→SEA)

Prices were available within the past 7 days and start at CA $273 for one-way flights and CA $492 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, Sep. 27 - Sat, Oct. 4
IAD
Washington
SEA
Seattle
CA $492 Roundtrip, found 3 days ago
CA $492
Roundtrip
found 3 days ago
Select United flight, departing Sat, Sep. 27 from Washington to Seattle, returning Sat, Oct. 4, priced at CA $492 found 3 days ago
Flight from Washington to Seattle (IAD - SEA) route information
Origin airport
Washington Dulles Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Popular airline
Alaska Airlines
Distance
3679 km
Average flight time
2 hours 48 mins
*Available to Expedia members.