BOS to SEA from $273 in economy – flightdeals.net

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United Airlines

UAUnited Airlines

Round Trip•Economy

Logan International Airport

Boston, United States

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

$464 USD

-41%$273 USD

Verified about 6 hours ago

June 2026

Mon

Tue

Wed

Thu

Fri

Sat

Sun

1 2 3 4 5 6 7 8 9 10 11$711 12$540 13$505 14$612 15$515 16$515 17$546 18$575 19$447 20$410 21$485 22$447 23$520 24$410 25$351 26$427 27$497 28$569 29$320 30$341 1$461 2$420 3$310 4$340 5$527

Limited Availability

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

Thursday, June 18th, 2026

2 round-trip options

Returning

Tue, Jun 23, 2026•5 Day Trip

$575 USD

Returning

Thu, Jul 2, 2026•14 Day Trip

$581 USD