Boston (BOS) to Seattle / Tacoma (SEA) flight deal in economy from $273
BOSLogan International Airport
Boston, United States
SEASeattle–Tacoma International Airport
Seattle / Tacoma, United States
$405 USD
-33%$273 USD
Verified 13 days agoAugust 2026
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Fair Availability
22% of dates checked are available within 10% of the lowest price
Sunday, August 16th, 2026
7 round-trip options
Returning
Fri, Aug 21, 2026•5 Day Trip
$432 USD
Returning
Sat, Aug 22, 2026•6 Day Trip
$467 USD
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Sun, Aug 23, 2026•7 Day Trip
$507 USD
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Mon, Aug 24, 2026•8 Day Trip
$432 USD
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Tue, Aug 25, 2026•9 Day Trip
$407 USD
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Thu, Aug 27, 2026•11 Day Trip
$467 USD
Returning
Fri, Aug 28, 2026•12 Day Trip
$387 USD