Seattle / Tacoma (SEA) to Washington (IAD) flight deal in economy from $209

United AirlinesUAUnited Airlines
One Way•Economy
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
United StatesIAD

Washington Dulles International Airport

Washington, United States
$266 USD
-21%$209 USD
Verified 27 days ago
Good Availability
40% of dates checked are available within 10% of the lowest price

Tuesday, September 29th, 2026

No flight details available for this date.