SEA to BOS from $384 in economy – flightdeals.net

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United Airlines

UAUnited Airlines

Round Trip•Economy

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

Logan International Airport

Boston, United States

$527 USD

-27%$384 USD

Verified about 4 hours ago

July 2026

Mon

Tue

Wed

Thu

Fri

Sat

Sun

29$489 30$389 1$518 2$567 3$493 4$419 5$709 6$516 7$493 8$419 9$487 10$515 11$540 12$772 13$552 14$455 15$476 16$582 17$526 18$644 19$708 20$512 21$394 22$431 23$576 24$545 25$405 26$691 27$466 28$384 29$414 30$479 31$550 1 2

Limited Availability

16% of dates checked are available within 10% of the lowest price

Thursday, July 30th, 2026

1 round-trip options

Returning

Thu, Aug 13, 2026•14 Day Trip

$479 USD