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 13 days ago
Rare Availability
9% of dates checked are available within 10% of the lowest price

Friday, July 17th, 2026

8 round-trip options

Returning
Wed, Jul 22, 2026•5 Day Trip
$745 USD
Google Flights
Returning
Thu, Jul 23, 2026•6 Day Trip
$789 USD
Google Flights
Returning
Fri, Jul 24, 2026•7 Day Trip
$755 USD
Google Flights
Returning
Sat, Jul 25, 2026•8 Day Trip
$755 USD
Google Flights
Returning
Sun, Jul 26, 2026•9 Day Trip
$705 USD
Google Flights
Returning
Tue, Jul 28, 2026•11 Day Trip
$684 USD
Google Flights
Returning
Wed, Jul 29, 2026•12 Day Trip
$743 USD
Google Flights
Returning
Thu, Jul 30, 2026•13 Day Trip
$747 USD
Google Flights