Flights from Boston to Northwest Washington

Cheapest flights from Boston

These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Sep 3 - Tue, Sep 9

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$217 Roundtrip, found 1 day ago

$217

Roundtrip

found 1 day ago

Select Hawaiian Airlines flight, departing Wed, Sep 3 from Logan Intl. to Seattle - Tacoma Intl., returning Tue, Sep 9, priced at $217 found 1 day ago

Tue, Sep 16 - Tue, Sep 23

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$217 Roundtrip, found 6 days ago

$217

Roundtrip

found 6 days ago

Select JetBlue Airways flight, departing Tue, Sep 16 from Logan Intl. to Seattle - Tacoma Intl., returning Tue, Sep 23, priced at $217 found 6 days ago

Wed, Sep 3 - Mon, Sep 8

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$227 Roundtrip, found 1 day ago

$227

Roundtrip

found 1 day ago

Select Alaska Airlines flight, departing Wed, Sep 3 from Logan Intl. to Seattle - Tacoma Intl., returning Mon, Sep 8, priced at $227 found 1 day ago

Mon, Sep 1 - Tue, Sep 9

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$232 Roundtrip, found 1 day ago

$232

Roundtrip

found 1 day ago

Select JetBlue Airways flight, departing Mon, Sep 1 from Logan Intl. to Seattle - Tacoma Intl., returning Tue, Sep 9, priced at $232 found 1 day ago

Wed, Aug 20 - Wed, Aug 27

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$237 Roundtrip, found 6 days ago

$237

Roundtrip

found 6 days ago

Select American Airlines flight, departing Wed, Aug 20 from Logan Intl. to Seattle - Tacoma Intl., returning Wed, Aug 27, priced at $237 found 6 days ago

Thu, Sep 4 - Mon, Sep 8

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$237 Roundtrip, found 1 day ago

$237

Roundtrip

found 1 day ago

Select Alaska Airlines flight, departing Thu, Sep 4 from Logan Intl. to Seattle - Tacoma Intl., returning Mon, Sep 8, priced at $237 found 1 day ago

Thu, Sep 4 - Thu, Sep 11

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$237 Roundtrip, found 1 day ago

$237

Roundtrip

found 1 day ago

Select Delta flight, departing Thu, Sep 4 from Logan Intl. to Seattle - Tacoma Intl., returning Thu, Sep 11, priced at $237 found 1 day ago

Mon, Sep 1 - Thu, Sep 11

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$242 Roundtrip, found 1 day ago

$242

Roundtrip

found 1 day ago

Select JetBlue Airways flight, departing Mon, Sep 1 from Logan Intl. to Seattle - Tacoma Intl., returning Thu, Sep 11, priced at $242 found 1 day ago

Mon, Sep 15 - Fri, Sep 26

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$247 Roundtrip, found 6 days ago

$247

Roundtrip

found 6 days ago

Select JetBlue Airways flight, departing Mon, Sep 15 from Logan Intl. to Seattle - Tacoma Intl., returning Fri, Sep 26, priced at $247 found 6 days ago

Thu, Sep 4 - Wed, Sep 10

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$257 Roundtrip, found 1 day ago

$257

Roundtrip

found 1 day ago

Select Alaska Airlines flight, departing Thu, Sep 4 from Logan Intl. to Seattle - Tacoma Intl., returning Wed, Sep 10, priced at $257 found 1 day ago

Wed, Sep 3 - Mon, Sep 8

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$262 Roundtrip, found 1 day ago

$262

Roundtrip

found 1 day ago

Select Hawaiian Airlines flight, departing Wed, Sep 3 from Logan Intl. to Seattle - Tacoma Intl., returning Mon, Sep 8, priced at $262 found 1 day ago

Wed, Aug 20 - Wed, Aug 27

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$267 Roundtrip, found 6 days ago

$267

Roundtrip

found 6 days ago

Select JetBlue Airways flight, departing Wed, Aug 20 from Logan Intl. to Seattle - Tacoma Intl., returning Wed, Aug 27, priced at $267 found 6 days ago

Mon, Sep 15 - Sat, Sep 27

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$267 Roundtrip, found 6 days ago

$267

Roundtrip

found 6 days ago

Select Hawaiian Airlines flight, departing Mon, Sep 15 from Logan Intl. to Seattle - Tacoma Intl., returning Sat, Sep 27, priced at $267 found 6 days ago

Wed, Aug 20 - Wed, Aug 27

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$270 Roundtrip, found 6 days ago

$270

Roundtrip

found 6 days ago

Select United flight, departing Wed, Aug 20 from Logan Intl. to Seattle - Tacoma Intl., returning Wed, Aug 27, priced at $270 found 6 days ago

Thu, Sep 4 - Mon, Sep 8

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$272 Roundtrip, found 1 day ago

$272

Roundtrip

found 1 day ago

Select Hawaiian Airlines flight, departing Thu, Sep 4 from Logan Intl. to Seattle - Tacoma Intl., returning Mon, Sep 8, priced at $272 found 1 day ago

Wed, Aug 20 - Wed, Aug 27

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$277 Roundtrip, found 6 days ago

$277

Roundtrip

found 6 days ago

Select American Airlines flight, departing Wed, Aug 20 from Logan Intl. to Seattle - Tacoma Intl., returning Wed, Aug 27, priced at $277 found 6 days ago

Fri, Sep 19 - Sun, Sep 28

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$277 Roundtrip, found 6 days ago

$277

Roundtrip

found 6 days ago

Select Hawaiian Airlines flight, departing Fri, Sep 19 from Logan Intl. to Seattle - Tacoma Intl., returning Sun, Sep 28, priced at $277 found 6 days ago

Wed, Aug 20 - Wed, Aug 27

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$282 Roundtrip, found 6 days ago

$282

Roundtrip

found 6 days ago

Select United flight, departing Wed, Aug 20 from Logan Intl. to Seattle - Tacoma Intl., returning Wed, Aug 27, priced at $282 found 6 days ago

Sun, Aug 31 - Wed, Sep 3

PVD

T.F. Green

SEA

Seattle - Tacoma Intl.

$332 Roundtrip, found 6 days ago

$332

Roundtrip

found 6 days ago

Select Delta flight, departing Sun, Aug 31 from T.F. Green to Seattle - Tacoma Intl., returning Wed, Sep 3, priced at $332 found 6 days ago

Sat, Sep 6 - Sat, Sep 6

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$337 Roundtrip, found 1 day ago

$337

Roundtrip

found 1 day ago

Select United flight, departing Sat, Sep 6 from Logan Intl. to Seattle - Tacoma Intl., returning Sat, Sep 6, priced at $337 found 1 day ago