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Cheap flights from Boston (BOS) to Seattle (BFI)

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1 Adults (11+)
0 Children (2~11)
0 Infants (0~2)
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How to find the cheapest flight from Boston (BOS) to Seattle (BFI)

How to find the cheapest flight from Boston (BOS) to Seattle (BFI)
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How to find the cheapest flight from Boston (BOS) to Seattle (BFI)
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How to find the cheapest flight from Boston (BOS) to Seattle (BFI)
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Cheap flights from Boston to Seattle in February , March 2026

19 Feb - 10 Mar $ 988.00
BOS
Boston
Frontier Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
BOS
Boston
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19 Feb - 09 Mar $ 1,006.00
BOS
Boston
Frontier Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
BOS
Boston
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19 Feb - 31 Mar $ 1,039.00
BOS
Boston
Frontier Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
BOS
Boston
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Last minute flights from Boston to Seattle

07 Feb - 02 Mar $ 1,841.00
BOS
Boston
AeroMéxico
3 STOPS
BFI
Seattle
BFI
Seattle
AeroMéxico
3 STOPS
BOS
Boston
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07 Feb - 02 Mar $ 1,997.00
BOS
Boston
AeroMéxico
3 STOPS
BFI
Seattle
BFI
Seattle
AeroMéxico
3 STOPS
BOS
Boston
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07 Feb - 01 Mar $ 2,078.00
BOS
Boston
AeroMéxico
3 STOPS
BFI
Seattle
BFI
Seattle
AeroMéxico
3 STOPS
BOS
Boston
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One-way flights to Seattle from Boston

1:30 PM - 3:05 PM
Air Excursions
3 Stops
29h 25m
BOS - BFI
$ 1,008
Kiwi
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8:42 AM - 3:05 PM
Air Excursions
2 Stops
34h 13m
BOS - BFI
$ 1,008
Kiwi
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1:30 PM - 3:05 PM
Air Excursions
3 Stops
29h 25m
BOS - BFI
$ 1,096
Kiwi
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How to find the cheapest flight from Boston (BOS) to Seattle (BFI)

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How to find the cheapest flight from Boston (BOS) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Boston (BOS) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.