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

Monday, December 28th, 2026

8 round-trip options

Returning
Sat, Jan 2, 2027•5 Day Trip
$617 USD
Google Flights
Returning
Sun, Jan 3, 2027•6 Day Trip
$571 USD
Google Flights
Returning
Mon, Jan 4, 2027•7 Day Trip
$447 USD
Google Flights
Returning
Tue, Jan 5, 2027•8 Day Trip
$447 USD
Google Flights
Returning
Wed, Jan 6, 2027•9 Day Trip
$447 USD
Google Flights
Returning
Thu, Jan 7, 2027•10 Day Trip
$447 USD
Google Flights
Returning
Sun, Jan 10, 2027•13 Day Trip
$447 USD
Google Flights
Returning
Mon, Jan 11, 2027•14 Day Trip
$447 USD
Google Flights