BOS to SEA from $317 in economy – flightdeals.net

Home Premium Fare Deals About

Delta Air Lines

DLDelta Air Lines

Round Trip•Economy

Logan International Airport

Boston, United States

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

$447 USD

-29%$317 USD

Verified 16 days ago

September 2026

Mon

Tue

Wed

Thu

Fri

Sat

Sun

31$352 1$352 2$352 3$352 4$352 5$352 6$387 7$352 8$427 9$317 10$352 11$352 12$317 13$427 14$352 15$317 16$317 17$352 18$387 19$352 20$387 21$352 22$317 23$317 24$352 25$352 26$317 27$352 28$352 29$317 30$317 1$352 2$352 3$317 4$352

Extremely Rare Availability

3% of dates checked are available within 10% of the lowest price

Friday, September 25th, 2026

5 round-trip options

Returning

Wed, Sep 30, 2026•5 Day Trip

$352 USD

Returning

Thu, Oct 1, 2026•6 Day Trip

$387 USD

Returning

Fri, Oct 2, 2026•7 Day Trip

$387 USD

Returning

Sat, Oct 3, 2026•8 Day Trip

$352 USD

Returning

Wed, Oct 7, 2026•12 Day Trip

$352 USD