IAD to SEA from $255 in economy – flightdeals.net

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United Airlines

UAUnited Airlines

Round Trip•Economy

Washington Dulles International Airport

Washington, United States

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

$450 USD

-43%$255 USD

Verified about 7 hours ago

June 2026

Mon

Tue

Wed

Thu

Fri

Sat

Sun

1 2 3$719 4$672 5$672 6$715 7$718 8$709 9$737 10$553 11$584 12$611 13$471 14$471 15$553 16$499 17$518 18$614 19$470 20$426 21$426 22$426 23$446 24$434 25$423 26$458 27$499 28$434 29$364 30$374 1$395 2$474 3$423 4$340 5$435

Limited Availability

11% of dates checked are available within 10% of the lowest price

Monday, June 1st, 2026

0 round-trip options

No flight details available for this date.