Flights from St. Louis to Cambridge

Cheapest flights from St. Louis

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.

Thu, Sep 25 - Thu, Oct 2

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$169 Roundtrip, found 2 days ago

$169

Roundtrip

found 2 days ago

Select Spirit Airlines flight, departing Thu, Sep 25 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Oct 2, priced at $169 found 2 days ago

Thu, Sep 18 - Wed, Sep 24

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$197 Roundtrip, found 5 days ago

$197

Roundtrip

found 5 days ago

Select Spirit Airlines flight, departing Thu, Sep 18 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Sep 24, priced at $197 found 5 days ago

Thu, Sep 18 - Sat, Sep 27

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$207 Roundtrip, found 5 days ago

$207

Roundtrip

found 5 days ago

Select Spirit Airlines flight, departing Thu, Sep 18 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Sep 27, priced at $207 found 5 days ago

Thu, Sep 25 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$217 Roundtrip, found 2 days ago

$217

Roundtrip

found 2 days ago

Select Spirit Airlines flight, departing Thu, Sep 25 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Oct 4, priced at $217 found 2 days ago

Sat, Aug 9 - Mon, Aug 18

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$227 Roundtrip, found 5 days ago

$227

Roundtrip

found 5 days ago

Select Spirit Airlines flight, departing Sat, Aug 9 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 18, priced at $227 found 5 days ago

Tue, Sep 23 - Wed, Oct 1

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$237 Roundtrip, found 2 days ago

$237

Roundtrip

found 2 days ago

Select Delta flight, departing Tue, Sep 23 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Oct 1, priced at $237 found 2 days ago

Sat, Aug 9 - Sun, Aug 17

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$237 Roundtrip, found 5 days ago

$237

Roundtrip

found 5 days ago

Select Spirit Airlines flight, departing Sat, Aug 9 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Aug 17, priced at $237 found 5 days ago

Thu, Aug 14 - Sat, Aug 16

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$238 Roundtrip, found 5 days ago

$238

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Aug 16, priced at $238 found 5 days ago

Fri, Aug 15 - Sat, Aug 16

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$245 Roundtrip, found 5 days ago

$245

Roundtrip

found 5 days ago

Select Spirit Airlines flight, departing Fri, Aug 15 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Aug 16, priced at $245 found 5 days ago

Mon, Sep 29 - Wed, Oct 1

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$260 Roundtrip, found 2 days ago

$260

Roundtrip

found 2 days ago

Select Delta flight, departing Mon, Sep 29 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Oct 1, priced at $260 found 2 days ago

Fri, Sep 26 - Wed, Oct 1

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$267 Roundtrip, found 2 days ago

$267

Roundtrip

found 2 days ago

Select Delta flight, departing Fri, Sep 26 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Oct 1, priced at $267 found 2 days ago

Thu, Sep 25 - Tue, Sep 30

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$283 Roundtrip, found 2 days ago

$283

Roundtrip

found 2 days ago

Select Delta flight, departing Thu, Sep 25 from Lambert-St. Louis Intl. to Logan Intl., returning Tue, Sep 30, priced at $283 found 2 days ago

Fri, Sep 26 - Thu, Oct 2

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$290 Roundtrip, found 2 days ago

$290

Roundtrip

found 2 days ago

Select Delta flight, departing Fri, Sep 26 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Oct 2, priced at $290 found 2 days ago

Tue, Sep 23 - Fri, Oct 3

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$308 Roundtrip, found 2 days ago

$308

Roundtrip

found 2 days ago

Select Delta flight, departing Tue, Sep 23 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Oct 3, priced at $308 found 2 days ago

Tue, Sep 23 - Sun, Oct 5

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$318 Roundtrip, found 2 days ago

$318

Roundtrip

found 2 days ago

Select Delta flight, departing Tue, Sep 23 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 5, priced at $318 found 2 days ago

Mon, Sep 29 - Fri, Oct 3

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$331 Roundtrip, found 2 days ago

$331

Roundtrip

found 2 days ago

Select Delta flight, departing Mon, Sep 29 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Oct 3, priced at $331 found 2 days ago

Fri, Sep 26 - Fri, Oct 3

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$338 Roundtrip, found 2 days ago

$338

Roundtrip

found 2 days ago

Select Delta flight, departing Fri, Sep 26 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Oct 3, priced at $338 found 2 days ago

Mon, Sep 29 - Sun, Oct 5

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$341 Roundtrip, found 2 days ago

$341

Roundtrip

found 2 days ago

Select Delta flight, departing Mon, Sep 29 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 5, priced at $341 found 2 days ago

Fri, Sep 26 - Sun, Oct 5

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$348 Roundtrip, found 2 days ago

$348

Roundtrip

found 2 days ago

Select Delta flight, departing Fri, Sep 26 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 5, priced at $348 found 2 days ago

Sun, Sep 28 - Mon, Oct 6

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$457 Roundtrip, found 2 days ago

$457

Roundtrip

found 2 days ago

Select American Airlines flight, departing Sun, Sep 28 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Oct 6, priced at $457 found 2 days ago