Seattle / Tacoma (SEA) to Boston (BOS) flight deal in economy from $137

United AirlinesUAUnited Airlines
One Way•Economy
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
United StatesBOS

Logan International Airport

Boston, United States
$179 USD
-23%$137 USD
Verified about 4 hours ago
Fair Availability
27% of dates checked are available within 10% of the lowest price

Tuesday, August 18th, 2026

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