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

Monday, June 22nd, 2026

10 round-trip options

Returning
Sat, Jun 27, 2026•5 Day Trip
$511 USD
Google Flights
Returning
Sun, Jun 28, 2026•6 Day Trip
$645 USD
Google Flights
Returning
Mon, Jun 29, 2026•7 Day Trip
$436 USD
Google Flights
Returning
Tue, Jun 30, 2026•8 Day Trip
$426 USD
Google Flights
Returning
Wed, Jul 1, 2026•9 Day Trip
$493 USD
Google Flights
Returning
Thu, Jul 2, 2026•10 Day Trip
$465 USD
Google Flights
Returning
Fri, Jul 3, 2026•11 Day Trip
$503 USD
Google Flights
Returning
Sat, Jul 4, 2026•12 Day Trip
$473 USD
Google Flights
Returning
Sun, Jul 5, 2026•13 Day Trip
$670 USD
Google Flights
Returning
Mon, Jul 6, 2026•14 Day Trip
$584 USD
Google Flights