SEA to DCA from $275 in economy

UAUnited Airlines

Round Trip•Economy

SEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

DCA

Ronald Reagan Washington National Airport

Washington, United States

$459 USD

-40%$275 USD

Verified 13 days ago

December 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

30$541 1$467 2$467 3$467 4$467 5$467 6$467 7$467 8$467 9$467 10$467 11$467 12$467 13$467 14$467 15$467 16$467 17$467 18$547 19$467 20$508 21$467 22$467 23$467 24$467 25$467 26$495 27$467 28$467 29$467 30$467 31$467 1$467 2$467 3$467

Limited Availability

12% of dates checked are available within 10% of the lowest price

Friday, December 11th, 2026

7 round-trip options

Returning

Wed, Dec 16, 2026•5 Day Trip

$467 USD

Google Flights

Returning

Fri, Dec 18, 2026•7 Day Trip

$640 USD

Google Flights

Returning

Sat, Dec 19, 2026•8 Day Trip

$562 USD

Google Flights

Returning

Sun, Dec 20, 2026•9 Day Trip

$467 USD

Google Flights

Returning

Mon, Dec 21, 2026•10 Day Trip

$495 USD

Google Flights

Returning

Tue, Dec 22, 2026•11 Day Trip

$506 USD

Google Flights

Returning

Wed, Dec 23, 2026•12 Day Trip

$467 USD

Google Flights

Seattle / Tacoma (SEA) to Washington (DCA) flight deal in economy from $275

Seattle–Tacoma International Airport

Ronald Reagan Washington National Airport

December 2026

Friday, December 11th, 2026