Seattle / Tacoma (SEA) to Washington (IAD) flight deal in economy from $255
SEASeattle–Tacoma International Airport
Seattle / Tacoma, United States
IADWashington Dulles International Airport
Washington, United States
$450 USD
-43%$255 USD
Verified 13 days agoAugust 2026
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Rare Availability
9% of dates checked are available within 10% of the lowest price
Wednesday, August 5th, 2026
8 round-trip options
Returning
Mon, Aug 10, 2026•5 Day Trip
$360 USD
Returning
Tue, Aug 11, 2026•6 Day Trip
$347 USD
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Wed, Aug 12, 2026•7 Day Trip
$347 USD
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Thu, Aug 13, 2026•8 Day Trip
$374 USD
Returning
Fri, Aug 14, 2026•9 Day Trip
$385 USD
Returning
Sun, Aug 16, 2026•11 Day Trip
$337 USD
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Mon, Aug 17, 2026•12 Day Trip
$337 USD
Returning
Tue, Aug 18, 2026•13 Day Trip
$343 USD