Seattle / Tacoma (SEA) to Washington (IAD) flight deal in economy from $148

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
$274 USD
-46%$148 USD
Verified about 7 hours ago
Limited Availability
10% of dates checked are available within 10% of the lowest price

Wednesday, September 9th, 2026

No flight details available for this date.