Flights from St. Louis to Boston

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.

Sun, Aug 17 - Fri, Aug 22

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$179 Roundtrip, found 4 days ago

$179

Roundtrip

found 4 days ago

Select Spirit Airlines flight, departing Sun, Aug 17 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Aug 22, priced at $179 found 4 days ago

Tue, Aug 12 - Fri, Aug 22

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$204 Roundtrip, found 3 days ago

$204

Roundtrip

found 3 days ago

Select American Airlines flight, departing Tue, Aug 12 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Aug 22, priced at $204 found 3 days ago

Thu, Aug 14 - Wed, Aug 20

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$213 Roundtrip, found 3 days ago

$213

Roundtrip

found 3 days ago

Select Spirit Airlines flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Aug 20, priced at $213 found 3 days ago

Tue, Aug 12 - Fri, Aug 22

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$218 Roundtrip, found 3 days ago

$218

Roundtrip

found 3 days ago

Select American Airlines flight, departing Tue, Aug 12 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Aug 22, priced at $218 found 3 days ago

Thu, Oct 2 - Thu, Oct 9

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$219 Roundtrip, found 5 days ago

$219

Roundtrip

found 5 days ago

Select Spirit Airlines flight, departing Thu, Oct 2 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Oct 9, priced at $219 found 5 days ago

Mon, Sep 29 - Mon, Oct 6

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$223 Roundtrip, found 5 days ago

$223

Roundtrip

found 5 days ago

Select American Airlines flight, departing Mon, Sep 29 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Oct 6, priced at $223 found 5 days ago

Sun, Sep 28 - Sun, Oct 5

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$224 Roundtrip, found 5 days ago

$224

Roundtrip

found 5 days ago

Select Spirit Airlines flight, departing Sun, Sep 28 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 5, priced at $224 found 5 days ago

Tue, Aug 12 - Wed, Aug 20

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$227 Roundtrip, found 3 days ago

$227

Roundtrip

found 3 days ago

Select Spirit Airlines flight, departing Tue, Aug 12 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Aug 20, priced at $227 found 3 days ago

Tue, Aug 12 - Fri, Aug 22

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$228 Roundtrip, found 3 days ago

$228

Roundtrip

found 3 days ago

Select United flight, departing Tue, Aug 12 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Aug 22, priced at $228 found 3 days ago

Sat, Aug 9 - Thu, Aug 21

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$230 Roundtrip, found 3 days ago

$230

Roundtrip

found 3 days ago

Select Spirit Airlines flight, departing Sat, Aug 9 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Aug 21, priced at $230 found 3 days ago

Sun, Aug 17 - Fri, Aug 22

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$234 Roundtrip, found 4 days ago

$234

Roundtrip

found 4 days ago

Select Spirit Airlines flight, departing Sun, Aug 17 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Aug 22, priced at $234 found 4 days ago

Thu, Aug 14 - Sat, Aug 23

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$237 Roundtrip, found 3 days ago

$237

Roundtrip

found 3 days ago

Select Spirit Airlines flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Aug 23, priced at $237 found 3 days ago

Mon, Sep 29 - Mon, Oct 6

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$240 Roundtrip, found 5 days ago

$240

Roundtrip

found 5 days ago

Select American Airlines flight, departing Mon, Sep 29 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Oct 6, priced at $240 found 5 days ago

Tue, Aug 12 - Fri, Aug 22

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$244 Roundtrip, found 3 days ago

$244

Roundtrip

found 3 days ago

Select United flight, departing Tue, Aug 12 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Aug 22, priced at $244 found 3 days ago

Tue, Aug 12 - Sat, Aug 23

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$251 Roundtrip, found 3 days ago

$251

Roundtrip

found 3 days ago

Select Spirit Airlines flight, departing Tue, Aug 12 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Aug 23, priced at $251 found 3 days ago

Mon, Sep 29 - Mon, Oct 6

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$256 Roundtrip, found 5 days ago

$256

Roundtrip

found 5 days ago

Select Delta flight, departing Mon, Sep 29 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Oct 6, priced at $256 found 5 days ago

Tue, Aug 12 - Fri, Aug 22

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$256 Roundtrip, found 3 days ago

$256

Roundtrip

found 3 days ago

Select American Airlines flight, departing Tue, Aug 12 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Aug 22, priced at $256 found 3 days ago

Tue, Aug 12 - Fri, Aug 22

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$258 Roundtrip, found 3 days ago

$258

Roundtrip

found 3 days ago

Select American Airlines flight, departing Tue, Aug 12 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Aug 22, priced at $258 found 3 days ago

Sun, Sep 28 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$262 Roundtrip, found 5 days ago

$262

Roundtrip

found 5 days ago

Select Spirit Airlines flight, departing Sun, Sep 28 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Oct 4, priced at $262 found 5 days ago

Sun, Aug 17 - Fri, Aug 22

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$264 Roundtrip, found 4 days ago

$264

Roundtrip

found 4 days ago

Select Spirit Airlines flight, departing Sun, Aug 17 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Aug 22, priced at $264 found 4 days ago