Flights from Boston to Union City

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.

Sat, Sep 6 - Sat, Sep 13

BOS

Logan Intl.

SFO

San Francisco Intl.

$237 Roundtrip, found 6 hours ago

$237

Roundtrip

found 6 hours ago

Select Alaska Airlines flight, departing Sat, Sep 6 from Logan Intl. to San Francisco Intl., returning Sat, Sep 13, priced at $237 found 6 hours ago

Tue, Jul 1 - Mon, Jul 7

BOS

Logan Intl.

SJC

Norman Y. Mineta San Jose Intl.

$247 Roundtrip, found 3 days ago

$247

Roundtrip

found 3 days ago

Select American Airlines flight, departing Tue, Jul 1 from Logan Intl. to Norman Y. Mineta San Jose Intl., returning Mon, Jul 7, priced at $247 found 3 days ago

Fri, Sep 5 - Sat, Sep 13

BOS

Logan Intl.

SFO

San Francisco Intl.

$248 Roundtrip, found 6 hours ago

$248

Roundtrip

found 6 hours ago

Select Hawaiian Airlines flight, departing Fri, Sep 5 from Logan Intl. to San Francisco Intl., returning Sat, Sep 13, priced at $248 found 6 hours ago

Tue, Jul 29 - Tue, Aug 12

BOS

Logan Intl.

SFO

San Francisco Intl.

$248 Roundtrip, found 14 hours ago

$248

Roundtrip

found 14 hours ago

Select Delta flight, departing Tue, Jul 29 from Logan Intl. to San Francisco Intl., returning Tue, Aug 12, priced at $248 found 14 hours ago

Sun, Sep 7 - Tue, Sep 16

BOS

Logan Intl.

SFO

San Francisco Intl.

$248 Roundtrip, found 6 hours ago

$248

Roundtrip

found 6 hours ago

Select JetBlue Airways flight, departing Sun, Sep 7 from Logan Intl. to San Francisco Intl., returning Tue, Sep 16, priced at $248 found 6 hours ago

Fri, Sep 5 - Thu, Sep 11

BOS

Logan Intl.

SFO

San Francisco Intl.

$259 Roundtrip, found 6 hours ago

$259

Roundtrip

found 6 hours ago

Select Hawaiian Airlines flight, departing Fri, Sep 5 from Logan Intl. to San Francisco Intl., returning Thu, Sep 11, priced at $259 found 6 hours ago

Mon, Sep 8 - Sun, Sep 14

BOS

Logan Intl.

SFO

San Francisco Intl.

$259 Roundtrip, found 6 hours ago

$259

Roundtrip

found 6 hours ago

Select United flight, departing Mon, Sep 8 from Logan Intl. to San Francisco Intl., returning Sun, Sep 14, priced at $259 found 6 hours ago

Mon, Jul 28 - Wed, Aug 13

BOS

Logan Intl.

SFO

San Francisco Intl.

$267 Roundtrip, found 14 hours ago

$267

Roundtrip

found 14 hours ago

Select JetBlue Airways flight, departing Mon, Jul 28 from Logan Intl. to San Francisco Intl., returning Wed, Aug 13, priced at $267 found 14 hours ago

Mon, Sep 8 - Sun, Sep 14

BOS

Logan Intl.

SFO

San Francisco Intl.

$269 Roundtrip, found 6 hours ago

$269

Roundtrip

found 6 hours ago

Select Alaska Airlines flight, departing Mon, Sep 8 from Logan Intl. to San Francisco Intl., returning Sun, Sep 14, priced at $269 found 6 hours ago

Mon, Sep 8 - Sun, Sep 14

BOS

Logan Intl.

SFO

San Francisco Intl.

$269 Roundtrip, found 6 hours ago

$269

Roundtrip

found 6 hours ago

Select United flight, departing Mon, Sep 8 from Logan Intl. to San Francisco Intl., returning Sun, Sep 14, priced at $269 found 6 hours ago

Tue, Jul 1 - Tue, Jul 8

BOS

Logan Intl.

SJC

Norman Y. Mineta San Jose Intl.

$277 Roundtrip, found 3 days ago

$277

Roundtrip

found 3 days ago

Select Hawaiian Airlines flight, departing Tue, Jul 1 from Logan Intl. to Norman Y. Mineta San Jose Intl., returning Tue, Jul 8, priced at $277 found 3 days ago

Mon, Sep 8 - Sun, Sep 14

BOS

Logan Intl.

SFO

San Francisco Intl.

$277 Roundtrip, found 6 hours ago

$277

Roundtrip

found 6 hours ago

Select JetBlue Airways flight, departing Mon, Sep 8 from Logan Intl. to San Francisco Intl., returning Sun, Sep 14, priced at $277 found 6 hours ago

Mon, Jun 30 - Mon, Jul 7

BOS

Logan Intl.

SJC

Norman Y. Mineta San Jose Intl.

$278 Roundtrip, found 3 days ago

$278

Roundtrip

found 3 days ago

Select Spirit Airlines flight, departing Mon, Jun 30 from Logan Intl. to Norman Y. Mineta San Jose Intl., returning Mon, Jul 7, priced at $278 found 3 days ago

Mon, Sep 8 - Sun, Sep 14

BOS

Logan Intl.

SFO

San Francisco Intl.

$280 Roundtrip, found 6 hours ago

$280

Roundtrip

found 6 hours ago

Select Frontier Airlines flight, departing Mon, Sep 8 from Logan Intl. to San Francisco Intl., returning Sun, Sep 14, priced at $280 found 6 hours ago

Wed, Jun 4 - Sun, Jun 8

BOS

Logan Intl.

SFO

San Francisco Intl.

$312 Roundtrip, found 6 days ago

$312

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Wed, Jun 4 from Logan Intl. to San Francisco Intl., returning Sun, Jun 8, priced at $312 found 6 days ago

Tue, Sep 9 - Tue, Sep 16

PVD

T.F. Green

SJC

Norman Y. Mineta San Jose Intl.

$343 Roundtrip, found 5 days ago

$343

Roundtrip

found 5 days ago

Select Delta flight, departing Tue, Sep 9 from T.F. Green to Norman Y. Mineta San Jose Intl., returning Tue, Sep 16, priced at $343 found 5 days ago

Mon, Jun 30 - Mon, Jul 7

BOS

Logan Intl.

SJC

Norman Y. Mineta San Jose Intl.

$350 Roundtrip, found 3 days ago

$350

Roundtrip

found 3 days ago

Select Spirit Airlines flight, departing Mon, Jun 30 from Logan Intl. to Norman Y. Mineta San Jose Intl., returning Mon, Jul 7, priced at $350 found 3 days ago

Tue, Jun 10 - Thu, Jun 19

BOS

Logan Intl.

OAK

Oakland Intl.

$368 Roundtrip, found 1 day ago

$368

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Tue, Jun 10 from Logan Intl. to Oakland Intl., returning Thu, Jun 19, priced at $368 found 1 day ago

Mon, Jun 30 - Tue, Jul 8

MHT

Manchester-Boston Regional

SJC

Norman Y. Mineta San Jose Intl.

$425 Roundtrip, found 8 hours ago

$425

Roundtrip

found 8 hours ago

Select United flight, departing Mon, Jun 30 from Manchester-Boston Regional to Norman Y. Mineta San Jose Intl., returning Tue, Jul 8, priced at $425 found 8 hours ago

Thu, Jun 12 - Fri, Jun 20

MHT

Manchester-Boston Regional

SFO

San Francisco Intl.

$597 Roundtrip, found 1 day ago

$597

Roundtrip

found 1 day ago

Select United flight, departing Thu, Jun 12 from Manchester-Boston Regional to San Francisco Intl., returning Fri, Jun 20, priced at $597 found 1 day ago