Washington (IAD) to Seattle / Tacoma (SEA) flight deal in economy from $255
IADWashington Dulles International Airport
Washington, United States
SEASeattle–Tacoma International Airport
Seattle / Tacoma, United States
$449 USD
-43%$255 USD
Verified 14 days agoAugust 2026
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Limited Availability
11% of dates checked are available within 10% of the lowest price
Saturday, August 8th, 2026
8 round-trip options
Returning
Thu, Aug 13, 2026•5 Day Trip
$354 USD
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Fri, Aug 14, 2026•6 Day Trip
$354 USD
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Sat, Aug 15, 2026•7 Day Trip
$503 USD
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Mon, Aug 17, 2026•9 Day Trip
$437 USD
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Tue, Aug 18, 2026•10 Day Trip
$464 USD
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Wed, Aug 19, 2026•11 Day Trip
$354 USD
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Thu, Aug 20, 2026•12 Day Trip
$376 USD
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Sat, Aug 22, 2026•14 Day Trip
$481 USD