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

Sunday, November 22nd, 2026

8 round-trip options

Returning
Fri, Nov 27, 2026•5 Day Trip
$447 USD
Google Flights
Returning
Sat, Nov 28, 2026•6 Day Trip
$744 USD
Google Flights
Returning
Sun, Nov 29, 2026•7 Day Trip
$1,063 USD
Google Flights
Returning
Mon, Nov 30, 2026•8 Day Trip
$571 USD
Google Flights
Returning
Tue, Dec 1, 2026•9 Day Trip
$482 USD
Google Flights
Returning
Wed, Dec 2, 2026•10 Day Trip
$453 USD
Google Flights
Returning
Sat, Dec 5, 2026•13 Day Trip
$447 USD
Google Flights
Returning
Sun, Dec 6, 2026•14 Day Trip
$447 USD
Google Flights