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
Monday, August 31st, 2026
8 round-trip options
Returning
Sat, Sep 5, 2026•5 Day Trip
$265 USD
Returning
Sun, Sep 6, 2026•6 Day Trip
$265 USD
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Mon, Sep 7, 2026•7 Day Trip
$265 USD
Returning
Tue, Sep 8, 2026•8 Day Trip
$275 USD
Returning
Wed, Sep 9, 2026•9 Day Trip
$275 USD
Returning
Fri, Sep 11, 2026•11 Day Trip
$265 USD
Returning
Sat, Sep 12, 2026•12 Day Trip
$265 USD
Returning
Sun, Sep 13, 2026•13 Day Trip
$275 USD