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
$450 USD
-43%$255 USD
Verified about 8 hours ago
Limited Availability
11% of dates checked are available within 10% of the lowest price

Tuesday, July 14th, 2026

10 round-trip options

Returning
Sun, Jul 19, 2026•5 Day Trip
$459 USD
Google Flights
Returning
Mon, Jul 20, 2026•6 Day Trip
$350 USD
Google Flights
Returning
Tue, Jul 21, 2026•7 Day Trip
$407 USD
Google Flights
Returning
Wed, Jul 22, 2026•8 Day Trip
$340 USD
Google Flights
Returning
Thu, Jul 23, 2026•9 Day Trip
$379 USD
Google Flights
Returning
Fri, Jul 24, 2026•10 Day Trip
$409 USD
Google Flights
Returning
Sat, Jul 25, 2026•11 Day Trip
$477 USD
Google Flights
Returning
Sun, Jul 26, 2026•12 Day Trip
$498 USD
Google Flights
Returning
Mon, Jul 27, 2026•13 Day Trip
$466 USD
Google Flights
Returning
Tue, Jul 28, 2026•14 Day Trip
$374 USD
Google Flights