Flights from Boston to Union

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, Aug 13 - Tue, Aug 26

PVD

T.F. Green

SEA

Seattle - Tacoma Intl.

$188 Roundtrip, found 5 hours ago

$188

Roundtrip

found 5 hours ago

Select American Airlines flight, departing Wed, Aug 13 from T.F. Green to Seattle - Tacoma Intl., returning Tue, Aug 26, priced at $188 found 5 hours ago

Sat, Sep 20 - Sat, Sep 27

PVD

T.F. Green

SEA

Seattle - Tacoma Intl.

$195 Roundtrip, found 2 days ago

$195

Roundtrip

found 2 days ago

Select American Airlines flight, departing Sat, Sep 20 from T.F. Green to Seattle - Tacoma Intl., returning Sat, Sep 27, priced at $195 found 2 days ago

Wed, Sep 17 - Wed, Sep 24

PVD

T.F. Green

SEA

Seattle - Tacoma Intl.

$197 Roundtrip, found 2 days ago

$197

Roundtrip

found 2 days ago

Select Delta flight, departing Wed, Sep 17 from T.F. Green to Seattle - Tacoma Intl., returning Wed, Sep 24, priced at $197 found 2 days ago

Tue, Sep 23 - Sat, Sep 27

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$207 Roundtrip, found 10 hours ago

$207

Roundtrip

found 10 hours ago

Select American Airlines flight, departing Tue, Sep 23 from Logan Intl. to Seattle - Tacoma Intl., returning Sat, Sep 27, priced at $207 found 10 hours ago

Sat, Sep 20 - Sat, Sep 27

PVD

T.F. Green

SEA

Seattle - Tacoma Intl.

$207 Roundtrip, found 2 days ago

$207

Roundtrip

found 2 days ago

Select American Airlines flight, departing Sat, Sep 20 from T.F. Green to Seattle - Tacoma Intl., returning Sat, Sep 27, priced at $207 found 2 days ago

Sat, Sep 20 - Sat, Sep 27

PVD

T.F. Green

SEA

Seattle - Tacoma Intl.

$210 Roundtrip, found 2 days ago

$210

Roundtrip

found 2 days ago

Select United flight, departing Sat, Sep 20 from T.F. Green to Seattle - Tacoma Intl., returning Sat, Sep 27, priced at $210 found 2 days ago

Wed, Aug 13 - Tue, Aug 26

PVD

T.F. Green

SEA

Seattle - Tacoma Intl.

$210 Roundtrip, found 5 hours ago

$210

Roundtrip

found 5 hours ago

Select American Airlines flight, departing Wed, Aug 13 from T.F. Green to Seattle - Tacoma Intl., returning Tue, Aug 26, priced at $210 found 5 hours ago

Tue, Sep 23 - Sat, Sep 27

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$211 Roundtrip, found 10 hours ago

$211

Roundtrip

found 10 hours ago

Select American Airlines flight, departing Tue, Sep 23 from Logan Intl. to Seattle - Tacoma Intl., returning Sat, Sep 27, priced at $211 found 10 hours ago

Sat, Sep 20 - Sat, Sep 27

PVD

T.F. Green

SEA

Seattle - Tacoma Intl.

$215 Roundtrip, found 2 days ago

$215

Roundtrip

found 2 days ago

Select United flight, departing Sat, Sep 20 from T.F. Green to Seattle - Tacoma Intl., returning Sat, Sep 27, priced at $215 found 2 days ago

Tue, Aug 19 - Sat, Sep 6

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$217 Roundtrip, found 2 days ago

$217

Roundtrip

found 2 days ago

Select American Airlines flight, departing Tue, Aug 19 from Logan Intl. to Seattle - Tacoma Intl., returning Sat, Sep 6, priced at $217 found 2 days ago

Tue, Sep 16 - Tue, Sep 23

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$217 Roundtrip, found 2 days ago

$217

Roundtrip

found 2 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 2 days ago

Tue, Sep 23 - Sat, Sep 27

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$217 Roundtrip, found 10 hours ago

$217

Roundtrip

found 10 hours ago

Select Alaska Airlines flight, departing Tue, Sep 23 from Logan Intl. to Seattle - Tacoma Intl., returning Sat, Sep 27, priced at $217 found 10 hours ago

Sat, Sep 20 - Sat, Sep 27

PVD

T.F. Green

SEA

Seattle - Tacoma Intl.

$223 Roundtrip, found 2 days ago

$223

Roundtrip

found 2 days ago

Select United flight, departing Sat, Sep 20 from T.F. Green to Seattle - Tacoma Intl., returning Sat, Sep 27, priced at $223 found 2 days ago

Sat, Sep 20 - Sat, Sep 27

PVD

T.F. Green

SEA

Seattle - Tacoma Intl.

$226 Roundtrip, found 2 days ago

$226

Roundtrip

found 2 days ago

Select United flight, departing Sat, Sep 20 from T.F. Green to Seattle - Tacoma Intl., returning Sat, Sep 27, priced at $226 found 2 days ago

Thu, Sep 18 - Tue, Sep 23

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$227 Roundtrip, found 2 days ago

$227

Roundtrip

found 2 days ago

Select Alaska Airlines flight, departing Thu, Sep 18 from Logan Intl. to Seattle - Tacoma Intl., returning Tue, Sep 23, priced at $227 found 2 days ago

Tue, Aug 19 - Wed, Sep 3

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$232 Roundtrip, found 18 hours ago

$232

Roundtrip

found 18 hours ago

Select Alaska Airlines flight, departing Tue, Aug 19 from Logan Intl. to Seattle - Tacoma Intl., returning Wed, Sep 3, priced at $232 found 18 hours ago

Wed, Aug 13 - Tue, Aug 26

PVD

T.F. Green

SEA

Seattle - Tacoma Intl.

$235 Roundtrip, found 5 hours ago

$235

Roundtrip

found 5 hours ago

Select United flight, departing Wed, Aug 13 from T.F. Green to Seattle - Tacoma Intl., returning Tue, Aug 26, priced at $235 found 5 hours ago

Tue, Sep 23 - Sat, Sep 27

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$237 Roundtrip, found 10 hours ago

$237

Roundtrip

found 10 hours ago

Select United flight, departing Tue, Sep 23 from Logan Intl. to Seattle - Tacoma Intl., returning Sat, Sep 27, priced at $237 found 10 hours ago

Tue, Sep 16 - Sun, Sep 28

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$237 Roundtrip, found 2 days ago

$237

Roundtrip

found 2 days ago

Select Hawaiian Airlines flight, departing Tue, Sep 16 from Logan Intl. to Seattle - Tacoma Intl., returning Sun, Sep 28, priced at $237 found 2 days ago

Wed, Jul 16 - Mon, Jul 21

BOS

Logan Intl.

SEA

Seattle - Tacoma Intl.

$643 Roundtrip, found 4 days ago

$643

Roundtrip

found 4 days ago

Select Sun Country Airlines flight, departing Wed, Jul 16 from Logan Intl. to Seattle - Tacoma Intl., returning Mon, Jul 21, priced at $643 found 4 days ago