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

United AirlinesUAUnited Airlines
Round Trip•Economy
United StatesIAD

Washington Dulles International Airport

Washington, United States
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
$449 USD
-43%$255 USD
Verified 14 days ago
Limited Availability
11% of dates checked are available within 10% of the lowest price

Tuesday, July 28th, 2026

8 round-trip options

Returning
Sun, Aug 2, 2026•5 Day Trip
$623 USD
Google Flights
Returning
Mon, Aug 3, 2026•6 Day Trip
$496 USD
Google Flights
Returning
Tue, Aug 4, 2026•7 Day Trip
$438 USD
Google Flights
Returning
Thu, Aug 6, 2026•9 Day Trip
$445 USD
Google Flights
Returning
Fri, Aug 7, 2026•10 Day Trip
$485 USD
Google Flights
Returning
Sat, Aug 8, 2026•11 Day Trip
$598 USD
Google Flights
Returning
Sun, Aug 9, 2026•12 Day Trip
$531 USD
Google Flights
Returning
Tue, Aug 11, 2026•14 Day Trip
$488 USD
Google Flights