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 5 days ago

$169

Roundtrip

found 5 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 5 days ago

Mon, Aug 18 - Sun, Aug 24

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$199 Roundtrip, found 13 hours ago

$199

Roundtrip

found 13 hours ago

Select Spirit Airlines flight, departing Mon, Aug 18 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Aug 24, priced at $199 found 13 hours ago

Thu, Sep 25 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$217 Roundtrip, found 5 days ago

$217

Roundtrip

found 5 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 5 days ago

Mon, Aug 18 - Thu, Aug 21

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$229 Roundtrip, found 13 hours ago

$229

Roundtrip

found 13 hours ago

Select Spirit Airlines flight, departing Mon, Aug 18 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Aug 21, priced at $229 found 13 hours ago

Sat, Sep 6 - Wed, Sep 10

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$237 Roundtrip, found 2 days ago

$237

Roundtrip

found 2 days ago

Select Delta flight, departing Sat, Sep 6 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Sep 10, priced at $237 found 2 days ago

Mon, Aug 18 - Wed, Aug 27

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$237 Roundtrip, found 13 hours ago

$237

Roundtrip

found 13 hours ago

Select Spirit Airlines flight, departing Mon, Aug 18 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Aug 27, priced at $237 found 13 hours ago

Fri, Aug 15 - Sat, Aug 23

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$238 Roundtrip, found 13 hours ago

$238

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Fri, Aug 15 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Aug 23, priced at $238 found 13 hours ago

Thu, Aug 7 - Fri, Aug 15

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$248 Roundtrip, found 2 days ago

$248

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Thu, Aug 7 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Aug 15, priced at $248 found 2 days ago

Sun, Sep 7 - Wed, Sep 10

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$255 Roundtrip, found 2 days ago

$255

Roundtrip

found 2 days ago

Select Spirit Airlines flight, departing Sun, Sep 7 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Sep 10, priced at $255 found 2 days ago

Sat, Sep 6 - Sun, Sep 7

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$260 Roundtrip, found 2 days ago

$260

Roundtrip

found 2 days ago

Select Delta flight, departing Sat, Sep 6 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Sep 7, priced at $260 found 2 days ago

Fri, Sep 26 - Wed, Oct 1

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$267 Roundtrip, found 5 days ago

$267

Roundtrip

found 5 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 5 days ago

Mon, Aug 18 - Sat, Aug 23

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$267 Roundtrip, found 13 hours ago

$267

Roundtrip

found 13 hours ago

Select Spirit Airlines flight, departing Mon, Aug 18 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Aug 23, priced at $267 found 13 hours ago

Thu, Aug 21 - Sun, Aug 24

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$269 Roundtrip, found 13 hours ago

$269

Roundtrip

found 13 hours ago

Select Spirit Airlines flight, departing Thu, Aug 21 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Aug 24, priced at $269 found 13 hours ago

Fri, Aug 15 - Sat, Aug 16

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$277 Roundtrip, found 2 days ago

$277

Roundtrip

found 2 days ago

Select Spirit Airlines flight, departing Fri, Aug 15 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Aug 16, priced at $277 found 2 days ago

Thu, Aug 7 - Sat, Aug 16

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$278 Roundtrip, found 2 days ago

$278

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Thu, Aug 7 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Aug 16, priced at $278 found 2 days ago

Thu, Sep 25 - Tue, Sep 30

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$283 Roundtrip, found 5 days ago

$283

Roundtrip

found 5 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 5 days ago

Fri, Aug 15 - Wed, Aug 27

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$287 Roundtrip, found 13 hours ago

$287

Roundtrip

found 13 hours ago

Select Spirit Airlines flight, departing Fri, Aug 15 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Aug 27, priced at $287 found 13 hours ago

Mon, Sep 8 - Mon, Sep 8

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$365 Roundtrip, found 2 days ago

$365

Roundtrip

found 2 days ago

Select United flight, departing Mon, Sep 8 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Sep 8, priced at $365 found 2 days ago

Sun, Sep 28 - Mon, Oct 6

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$457 Roundtrip, found 5 days ago

$457

Roundtrip

found 5 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 5 days ago

Sun, Sep 28 - Fri, Oct 3

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$474 Roundtrip, found 5 days ago

$474

Roundtrip

found 5 days ago

Select American Airlines flight, departing Sun, Sep 28 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Oct 3, priced at $474 found 5 days ago