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 28th, 2026

10 round-trip options

Returning
Sun, Aug 2, 2026•5 Day Trip
$441 USD
Google Flights
Returning
Mon, Aug 3, 2026•6 Day Trip
$402 USD
Google Flights
Returning
Tue, Aug 4, 2026•7 Day Trip
$389 USD
Google Flights
Returning
Wed, Aug 5, 2026•8 Day Trip
$344 USD
Google Flights
Returning
Thu, Aug 6, 2026•9 Day Trip
$361 USD
Google Flights
Returning
Fri, Aug 7, 2026•10 Day Trip
$402 USD
Google Flights
Returning
Sat, Aug 8, 2026•11 Day Trip
$332 USD
Google Flights
Returning
Sun, Aug 9, 2026•12 Day Trip
$566 USD
Google Flights
Returning
Mon, Aug 10, 2026•13 Day Trip
$431 USD
Google Flights
Returning
Tue, Aug 11, 2026•14 Day Trip
$419 USD
Google Flights