SEA to IAD from $255 in economy

ASAlaska Airlines, Inc.

Round Trip•Economy

SEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

IAD

Washington Dulles International Airport

Washington, United States

$458 USD

-44%$255 USD

Verified about 3 hours ago

December 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

30$778 1$497 2$447 3$447 4$447 5$447 6$447 7$447 8$447 9$447 10$447 11$447 12$497 13$497 14$497 15$497 16$542 17$577 18$652 19$802 20$652 21$552 22$497 23$497 24$447 25$447 26$497 27$542 28$497 29$447 30$447 31$497 1$497 2$542 3$542

Extremely Rare Availability

4% of dates checked are available within 10% of the lowest price

Tuesday, December 29th, 2026

7 round-trip options

Returning

Sun, Jan 3, 2027•5 Day Trip

$542 USD

Google Flights

Returning

Tue, Jan 5, 2027•7 Day Trip

$447 USD

Google Flights

Returning

Fri, Jan 8, 2027•10 Day Trip

$447 USD

Google Flights

Returning

Sat, Jan 9, 2027•11 Day Trip

$447 USD

Google Flights

Returning

Sun, Jan 10, 2027•12 Day Trip

$447 USD

Google Flights

Returning

Mon, Jan 11, 2027•13 Day Trip

$447 USD

Google Flights

Returning

Tue, Jan 12, 2027•14 Day Trip

$447 USD

Google Flights

Seattle / Tacoma (SEA) to Washington (IAD) flight deal in economy from $255

Seattle–Tacoma International Airport

Washington Dulles International Airport

December 2026

Tuesday, December 29th, 2026