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
$450 USD
-43%$255 USD
Verified about 8 hours agoJuly 2026
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Limited Availability
11% of dates checked are available within 10% of the lowest price
Friday, July 17th, 2026
10 round-trip options
Returning
Wed, Jul 22, 2026•5 Day Trip
$383 USD
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Thu, Jul 23, 2026•6 Day Trip
$422 USD
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Fri, Jul 24, 2026•7 Day Trip
$452 USD
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Sat, Jul 25, 2026•8 Day Trip
$520 USD
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Sun, Jul 26, 2026•9 Day Trip
$541 USD
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Mon, Jul 27, 2026•10 Day Trip
$509 USD
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Tue, Jul 28, 2026•11 Day Trip
$417 USD
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Wed, Jul 29, 2026•12 Day Trip
$422 USD
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Thu, Jul 30, 2026•13 Day Trip
$450 USD
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Fri, Jul 31, 2026•14 Day Trip
$422 USD