Flights to Northwest Washington from Boston - ￥15,910

View ￥15,910 flight on Tue, Nov 4, 2025Opens in a new window

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Cheap Flights from Boston to Northwest Washington (BOS-SEA)

Prices were available within the past 7 days and start at ￥15,910 for one-way flights and ￥31,810 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Nov 4 - Wed, Nov 12
BOS
Boston
SEA
Seattle
￥31,810 Roundtrip, found 2 days ago
￥31,810
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Nov 4 from Boston to Seattle, returning Wed, Nov 12, priced at ￥31,810 found 2 days ago
Delta
Tue, Nov 4 - Wed, Nov 12
BOS
Boston
SEA
Seattle
￥33,350 Roundtrip, found 2 days ago
￥33,350
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Nov 4 from Boston to Seattle, returning Wed, Nov 12, priced at ￥33,350 found 2 days ago
American Airlines
Tue, Nov 4 - Wed, Nov 12
BOS
Boston
SEA
Seattle
￥34,120 Roundtrip, found 2 days ago
￥34,120
Roundtrip
found 2 days ago
Select American Airlines flight, departing Tue, Nov 4 from Boston to Seattle, returning Wed, Nov 12, priced at ￥34,120 found 2 days ago
United
Tue, Nov 4 - Wed, Nov 12
BOS
Boston
SEA
Seattle
￥39,900 Roundtrip, found 2 days ago
￥39,900
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 4 from Boston to Seattle, returning Wed, Nov 12, priced at ￥39,900 found 2 days ago
Hawaiian Airlines
Sat, Jul 26 - Wed, Jul 30
BOS
Boston
SEA
Seattle
￥60,700 Roundtrip, found 1 day ago
￥60,700
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Sat, Jul 26 from Boston to Seattle, returning Wed, Jul 30, priced at ￥60,700 found 1 day ago
JetBlue Airways
Wed, Jul 30 - Tue, Aug 5
BOS
Boston
SEA
Seattle
￥69,580 Roundtrip, found 1 day ago
￥69,580
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Wed, Jul 30 from Boston to Seattle, returning Tue, Aug 5, priced at ￥69,580 found 1 day ago
*Available to Expedia members.