Flights from St. Louis to Millis

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, Oct 2 - Sat, Oct 18

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$199 Roundtrip, found 2 days ago

$199

Roundtrip

found 2 days ago

Select Spirit Airlines flight, departing Thu, Oct 2 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Oct 18, priced at $199 found 2 days ago

Thu, Oct 2 - Sun, Oct 19

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$201 Roundtrip, found 2 days ago

$201

Roundtrip

found 2 days ago

Select Spirit Airlines flight, departing Thu, Oct 2 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 19, priced at $201 found 2 days ago

Mon, Oct 6 - Sat, Oct 18

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$209 Roundtrip, found 1 day ago

$209

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Mon, Oct 6 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Oct 18, priced at $209 found 1 day ago

Mon, Oct 6 - Sun, Oct 19

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$211 Roundtrip, found 1 day ago

$211

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Mon, Oct 6 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 19, priced at $211 found 1 day ago

Sun, Oct 5 - Sat, Oct 18

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$219 Roundtrip, found 2 days ago

$219

Roundtrip

found 2 days ago

Select Spirit Airlines flight, departing Sun, Oct 5 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Oct 18, priced at $219 found 2 days ago

Mon, Oct 6 - Thu, Oct 16

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$221 Roundtrip, found 1 day ago

$221

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Mon, Oct 6 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Oct 16, priced at $221 found 1 day ago

Sun, Oct 5 - Thu, Oct 16

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$231 Roundtrip, found 2 days ago

$231

Roundtrip

found 2 days ago

Select Spirit Airlines flight, departing Sun, Oct 5 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Oct 16, priced at $231 found 2 days ago

Sat, Aug 9 - Thu, Aug 14

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$242 Roundtrip, found 5 days ago

$242

Roundtrip

found 5 days ago

Select Spirit Airlines flight, departing Sat, Aug 9 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Aug 14, priced at $242 found 5 days ago

Thu, Aug 7 - Sat, Aug 9

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$250 Roundtrip, found 5 days ago

$250

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Thu, Aug 7 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Aug 9, priced at $250 found 5 days ago

Thu, Oct 9 - Fri, Oct 17

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$252 Roundtrip, found 1 day ago

$252

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Oct 9 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Oct 17, priced at $252 found 1 day ago

Thu, Oct 2 - Tue, Oct 21

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$258 Roundtrip, found 2 days ago

$258

Roundtrip

found 2 days ago

Select Spirit Airlines flight, departing Thu, Oct 2 from Lambert-St. Louis Intl. to Logan Intl., returning Tue, Oct 21, priced at $258 found 2 days ago

Sat, Aug 9 - Wed, Aug 13

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$259 Roundtrip, found 5 days ago

$259

Roundtrip

found 5 days ago

Select Spirit Airlines flight, departing Sat, Aug 9 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Aug 13, priced at $259 found 5 days ago

Thu, Aug 7 - Thu, Aug 14

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 Thu, Aug 7 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Aug 14, priced at $262 found 5 days ago

Mon, Oct 6 - Tue, Oct 21

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$268 Roundtrip, found 1 day ago

$268

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Mon, Oct 6 from Lambert-St. Louis Intl. to Logan Intl., returning Tue, Oct 21, priced at $268 found 1 day ago

Tue, Aug 5 - Thu, Aug 14

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$270 Roundtrip, found 5 days ago

$270

Roundtrip

found 5 days ago

Select Spirit Airlines flight, departing Tue, Aug 5 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Aug 14, priced at $270 found 5 days ago

Sun, Oct 5 - Tue, Oct 21

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$278 Roundtrip, found 2 days ago

$278

Roundtrip

found 2 days ago

Select Spirit Airlines flight, departing Sun, Oct 5 from Lambert-St. Louis Intl. to Logan Intl., returning Tue, Oct 21, priced at $278 found 2 days ago

Tue, Aug 5 - Wed, Aug 13

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$287 Roundtrip, found 5 days ago

$287

Roundtrip

found 5 days ago

Select Spirit Airlines flight, departing Tue, Aug 5 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Aug 13, priced at $287 found 5 days ago

Tue, Oct 7 - Wed, Oct 15

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$363 Roundtrip, found 10 hours ago

$363

Roundtrip

found 10 hours ago

Select Delta flight, departing Tue, Oct 7 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Oct 15, priced at $363 found 10 hours ago

Thu, Aug 7 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$363 Roundtrip, found 5 days ago

$363

Roundtrip

found 5 days ago

Select American Airlines flight, departing Thu, Aug 7 from Lambert-St. Louis Intl. to Logan Intl., returning Tue, Aug 12, priced at $363 found 5 days ago

Thu, Aug 7 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$402 Roundtrip, found 5 days ago

$402

Roundtrip

found 5 days ago

Select United flight, departing Thu, Aug 7 from Lambert-St. Louis Intl. to Logan Intl., returning Tue, Aug 12, priced at $402 found 5 days ago