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 4 hours ago

September 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

31$295 1$295 2$295 3$295 4$340 5$295 6$340 7$305 8$285 9$255 10$295 11$285 12$295 13$331 14$295 15$255 16$255 17$255 18$255 19$255 20$340 21$295 22$255 23$255 24$295 25$295 26$346 27$391 28$306 29$306 30$306 1$357 2$357 3$357 4$357

Extremely Rare Availability

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

Tuesday, September 22nd, 2026

9 round-trip options

Returning

Sun, Sep 27, 2026•5 Day Trip

$255 USD

Google Flights

Returning

Mon, Sep 28, 2026•6 Day Trip

$255 USD

Google Flights

Returning

Tue, Sep 29, 2026•7 Day Trip

$255 USD

Google Flights

Returning

Wed, Sep 30, 2026•8 Day Trip

$255 USD

Google Flights

Returning

Thu, Oct 1, 2026•9 Day Trip

$306 USD

Google Flights

Returning

Fri, Oct 2, 2026•10 Day Trip

$306 USD

Google Flights

Returning

Sun, Oct 4, 2026•12 Day Trip

$306 USD

Google Flights

Returning

Mon, Oct 5, 2026•13 Day Trip

$306 USD

Google Flights

Returning

Tue, Oct 6, 2026•14 Day Trip

$306 USD

Google Flights

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

Seattle–Tacoma International Airport

Washington Dulles International Airport

September 2026

Tuesday, September 22nd, 2026