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.

Thu, Aug 14 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$174 Roundtrip, found 10 hours ago

$174

Roundtrip

found 10 hours ago

Select Spirit Airlines flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 25, priced at $174 found 10 hours ago

Fri, Aug 15 - Fri, Aug 22

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$179 Roundtrip, found 14 hours ago

$179

Roundtrip

found 14 hours ago

Select Spirit Airlines flight, departing Fri, Aug 15 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Aug 22, priced at $179 found 14 hours ago

Thu, Aug 14 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$183 Roundtrip, found 10 hours ago

$183

Roundtrip

found 10 hours ago

Select Delta flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 25, priced at $183 found 10 hours ago

Sun, Aug 17 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$187 Roundtrip, found 14 hours ago

$187

Roundtrip

found 14 hours ago

Select Spirit Airlines flight, departing Sun, Aug 17 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 25, priced at $187 found 14 hours ago

Thu, Aug 14 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$189 Roundtrip, found 10 hours ago

$189

Roundtrip

found 10 hours ago

Select American Airlines flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 25, priced at $189 found 10 hours ago

Thu, Aug 14 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$192 Roundtrip, found 10 hours ago

$192

Roundtrip

found 10 hours ago

Select Spirit Airlines flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 25, priced at $192 found 10 hours ago

Fri, Aug 15 - Wed, Aug 27

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$197 Roundtrip, found 14 hours ago

$197

Roundtrip

found 14 hours ago

Select Spirit Airlines flight, departing Fri, Aug 15 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Aug 27, priced at $197 found 14 hours ago

Mon, Aug 18 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$199 Roundtrip, found 1 day ago

$199

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Mon, Aug 18 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 25, priced at $199 found 1 day ago

Fri, Aug 15 - Sat, Aug 23

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$207 Roundtrip, found 14 hours ago

$207

Roundtrip

found 14 hours ago

Select Spirit Airlines flight, departing Fri, Aug 15 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Aug 23, priced at $207 found 14 hours ago

Thu, Aug 14 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$208 Roundtrip, found 10 hours ago

$208

Roundtrip

found 10 hours ago

Select Spirit Airlines flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 25, priced at $208 found 10 hours ago

Thu, Aug 14 - Mon, Aug 18

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$209 Roundtrip, found 10 hours ago

$209

Roundtrip

found 10 hours ago

Select Spirit Airlines flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 18, priced at $209 found 10 hours ago

Tue, Aug 12 - Wed, Aug 27

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$215 Roundtrip, found 14 hours ago

$215

Roundtrip

found 14 hours ago

Select Spirit Airlines flight, departing Tue, Aug 12 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Aug 27, priced at $215 found 14 hours ago

Thu, Aug 14 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$217 Roundtrip, found 10 hours ago

$217

Roundtrip

found 10 hours ago

Select American Airlines flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 25, priced at $217 found 10 hours ago

Thu, Aug 14 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$217 Roundtrip, found 10 hours ago

$217

Roundtrip

found 10 hours ago

Select Delta flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 25, priced at $217 found 10 hours ago

Thu, Aug 14 - Thu, Aug 21

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$217 Roundtrip, found 15 hours ago

$217

Roundtrip

found 15 hours ago

Select American Airlines flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Aug 21, priced at $217 found 15 hours ago

Thu, Aug 14 - Mon, Aug 18

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$218 Roundtrip, found 10 hours ago

$218

Roundtrip

found 10 hours ago

Select Delta flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 18, priced at $218 found 10 hours ago

Sun, Aug 17 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$222 Roundtrip, found 1 day ago

$222

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Sun, Aug 17 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 25, priced at $222 found 1 day ago

Thu, Aug 14 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$223 Roundtrip, found 10 hours ago

$223

Roundtrip

found 10 hours ago

Select United flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 25, priced at $223 found 10 hours ago

Thu, Aug 14 - Sun, Aug 24

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$225 Roundtrip, found 10 hours ago

$225

Roundtrip

found 10 hours ago

Select Spirit Airlines flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Aug 24, priced at $225 found 10 hours ago

Thu, Aug 14 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$226 Roundtrip, found 10 hours ago

$226

Roundtrip

found 10 hours ago

Select Spirit Airlines flight, departing Thu, Aug 14 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Aug 25, priced at $226 found 10 hours ago