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

Thursday, December 24th, 2026

8 round-trip options

Returning
Tue, Dec 29, 2026•5 Day Trip
$517 USD
Google Flights
Returning
Wed, Dec 30, 2026•6 Day Trip
$485 USD
Google Flights
Returning
Thu, Dec 31, 2026•7 Day Trip
$457 USD
Google Flights
Returning
Fri, Jan 1, 2027•8 Day Trip
$490 USD
Google Flights
Returning
Sat, Jan 2, 2027•9 Day Trip
$652 USD
Google Flights
Returning
Sun, Jan 3, 2027•10 Day Trip
$571 USD
Google Flights
Returning
Wed, Jan 6, 2027•13 Day Trip
$447 USD
Google Flights
Returning
Thu, Jan 7, 2027•14 Day Trip
$447 USD
Google Flights