Boston (BOS) to Seattle / Tacoma (SEA) flight deal in economy from $317

Delta Air LinesDLDelta Air Lines
Round Trip•Economy
United StatesBOS

Logan International Airport

Boston, United States
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
$447 USD
-29%$317 USD
Verified 16 days ago
Extremely Rare Availability
3% of dates checked are available within 10% of the lowest price

Monday, August 17th, 2026

6 round-trip options

Returning
Sat, Aug 22, 2026•5 Day Trip
$462 USD
Google Flights
Returning
Wed, Aug 26, 2026•9 Day Trip
$422 USD
Google Flights
Returning
Thu, Aug 27, 2026•10 Day Trip
$462 USD
Google Flights
Returning
Fri, Aug 28, 2026•11 Day Trip
$422 USD
Google Flights
Returning
Sun, Aug 30, 2026•13 Day Trip
$552 USD
Google Flights
Returning
Mon, Aug 31, 2026•14 Day Trip
$462 USD
Google Flights