Cheap Flights from Boston to Bellevue

View €87 flight on Thu, 11 Sep 2025Opens in a new window

Popular airlines from Boston to Bellevue

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Cheap flights from Boston to Bellevue (BOS-SEA)

Prices were available within the past 7 days and start at €87 for one-way flights and €173 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

JetBlue Airways
Mon, 8 Sep - Tue, 16 Sep
BOS
Boston
SEA
Seattle
€173 Return, found 2 hours ago
€173
Return
found 2 hours ago
Select JetBlue Airways flight, departing Mon, 8 Sep from Boston to Seattle, returning Tue, 16 Sep, priced at €173 found 2 hours ago
JetBlue Airways
Mon, 8 Sep - Tue, 16 Sep
BOS
Boston
SEA
Seattle
€182 Return, found 2 hours ago
€182
Return
found 2 hours ago
Select JetBlue Airways flight, departing Mon, 8 Sep from Boston to Seattle, returning Tue, 16 Sep, priced at €182 found 2 hours ago
JetBlue Airways
Sat, 13 Sep - Sat, 20 Sep
BOS
Boston
SEA
Seattle
€187 Return, found 4 days ago
€187
Return
found 4 days ago
Select JetBlue Airways flight, departing Sat, 13 Sep from Boston to Seattle, returning Sat, 20 Sep, priced at €187 found 4 days ago
Delta
Sat, 13 Sep - Sat, 20 Sep
BOS
Boston
SEA
Seattle
€188 Return, found 4 days ago
€188
Return
found 4 days ago
Select Delta flight, departing Sat, 13 Sep from Boston to Seattle, returning Sat, 20 Sep, priced at €188 found 4 days ago
American Airlines
Mon, 8 Sep - Tue, 16 Sep
BOS
Boston
SEA
Seattle
€190 Return, found 2 hours ago
€190
Return
found 2 hours ago
Select American Airlines flight, departing Mon, 8 Sep from Boston to Seattle, returning Tue, 16 Sep, priced at €190 found 2 hours ago
United
Sat, 13 Sep - Sat, 20 Sep
BOS
Boston
SEA
Seattle
€248 Return, found 4 days ago
€248
Return
found 4 days ago
Select United flight, departing Sat, 13 Sep from Boston to Seattle, returning Sat, 20 Sep, priced at €248 found 4 days ago

Find the cheapest month to fly from Boston (BOS) to Seattle (SEA)

March is typically the cheapest month to fly

From €135 - €266 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.