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

July 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

29 30 1 2 3 4 5$792 6$783 7$870 8$756 9$778 10$778 11$729 12$670 13$579 14$537 15$537 16$607 17$580 18$622 19$525 20$427 21$442 22$427 23$467 24$505 25$484 26$468 27$406 28$334 29$297 30$393 31$347 1$431 2$575

Limited Availability

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

Thursday, July 16th, 2026

9 round-trip options

Returning

Tue, Jul 21, 2026•5 Day Trip

$755 USD

Google Flights

Returning

Wed, Jul 22, 2026•6 Day Trip

$755 USD

Google Flights

Returning

Thu, Jul 23, 2026•7 Day Trip

$793 USD

Google Flights

Returning

Fri, Jul 24, 2026•8 Day Trip

$793 USD

Google Flights

Returning

Sat, Jul 25, 2026•9 Day Trip

$755 USD

Google Flights

Returning

Sun, Jul 26, 2026•10 Day Trip

$740 USD

Google Flights

Returning

Tue, Jul 28, 2026•12 Day Trip

$607 USD

Google Flights

Returning

Wed, Jul 29, 2026•13 Day Trip

$703 USD

Google Flights

Returning

Thu, Jul 30, 2026•14 Day Trip

$792 USD

Google Flights

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

Seattle–Tacoma International Airport

Ronald Reagan Washington National Airport

July 2026

Thursday, July 16th, 2026