CA $274 Cheap United fights from Washington (IAD) to Seattle (SEA)

View CA $274 flight on Wed, Oct. 15, 2025Opens in a new window

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

United flights from Washington to Seattle (IAD→SEA)

Prices were available within the past 7 days and start at CA $274 for one-way flights and CA $519 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Oct. 8 - Tue, Oct. 14
IAD
Washington
SEA
Seattle
CA $519 Roundtrip, found 12 hours ago
CA $519
Roundtrip
found 12 hours ago
Select United flight, departing Wed, Oct. 8 from Washington to Seattle, returning Tue, Oct. 14, priced at CA $519 found 12 hours 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, Hawaiian Airlines, United
Popular airline
Alaska Airlines
Distance
3679 km
Average flight time
2 hours 48 mins
*Available to Expedia members.