BOS to SEA from $317 in economy

DLDelta Air Lines

Round Trip•Economy

BOS

Logan International Airport

Boston, United States

SEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

$447 USD

-29%$317 USD

Verified 16 days ago

July 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

29 30 1 2 3 4 5$942 6$732 7$732 8$587 9$587 10$587 11$587 12$487 13$487 14$427 15$427 16$487 17$427 18$437 19$377 20$437 21$447 22$497 23$377 24$472 25$502 26$513 27$462 28$352 29$422 30$422 31$552 1$457 2$478

Extremely Rare Availability

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

Tuesday, July 28th, 2026

6 round-trip options

Returning

Sun, Aug 2, 2026•5 Day Trip

$517 USD

Google Flights

Returning

Thu, Aug 6, 2026•9 Day Trip

$387 USD

Google Flights

Returning

Fri, Aug 7, 2026•10 Day Trip

$352 USD

Google Flights

Returning

Sat, Aug 8, 2026•11 Day Trip

$527 USD

Google Flights

Returning

Mon, Aug 10, 2026•13 Day Trip

$443 USD

Google Flights

Returning

Tue, Aug 11, 2026•14 Day Trip

$387 USD

Google Flights

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

Logan International Airport

Seattle–Tacoma International Airport

July 2026

Tuesday, July 28th, 2026