Seattle / Tacoma (SEA) to Washington (IAD) flight deal in economy from $255

United AirlinesUAUnited Airlines
Round Trip•Economy
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
United StatesIAD

Washington Dulles International Airport

Washington, United States
$450 USD
-43%$255 USD
Verified 14 days ago
Rare Availability
9% of dates checked are available within 10% of the lowest price

Saturday, June 27th, 2026

0 round-trip options

No flight details available for this date.