Flights Boston → Seattle

One way · Economy · 1 adult · price per person · next 14 days from September 10, 2026

Last observed price on Aviasales for 8 of 15 dates; the lowest is $234. Prices are not guaranteed and are confirmed at booking time.

Last observed price by date

Date	Last observed price	Flight	Departure	Arrival	Stops
Thu, Sep 10	—	—	—	—	—
Fri, Sep 11	—	—	—	—	—
Sat, Sep 12	—	—	—	—	—
Sun, Sep 13	$326	United Airlines UA1414 (1st of 2 flights)	6:00 AM Logan (BOS)	11:32 AM Sea-Tac (SEA)	1 stop · Chicago O'Hare
Mon, Sep 14	—	—	—	—	—
Tue, Sep 15	$244	Alaska Airlines AS306	7:59 PM Logan (BOS)	11:12 PM Sea-Tac (SEA)	Direct
Wed, Sep 16	$273	United Airlines UA1734 (1st of 4 flights)	5:45 AM Logan (BOS)	11:57 AM (+1) Sea-Tac (SEA)	3 stops · Washington Dulles, Calgary, Denver International
Thu, Sep 17	$234lowest	Alaska Airlines AS459	7:12 AM Logan (BOS)	10:25 AM Sea-Tac (SEA)	Direct
Fri, Sep 18	$286	Alaska Airlines AS459	7:12 AM Logan (BOS)	10:25 AM Sea-Tac (SEA)	Direct
Sat, Sep 19	$286	JetBlue B6397	7:20 PM Logan (BOS)	10:37 PM Sea-Tac (SEA)	Direct
Sun, Sep 20	$297	JetBlue B6397	7:20 PM Logan (BOS)	10:37 PM Sea-Tac (SEA)	Direct
Mon, Sep 21	$252	JetBlue B6397	7:20 PM Logan (BOS)	10:37 PM Sea-Tac (SEA)	Direct
Tue, Sep 22	—	—	—	—	—
Wed, Sep 23	—	—	—	—	—
Thu, Sep 24	—	—	—	—	—

Price not guaranteed: it is confirmed on Aviasales at booking time. How it works

Boston, United States (BOS, city code)

Boston Logan (BOS).

Seattle, United States (SEA, city code)

Seattle-Tacoma (SEA).

FromToDeparture date