Flights from St. Louis to New Castle

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, Sep 28 - Thu, Oct 2

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$210 Roundtrip, found 1 day ago

$210

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sun, Sep 28 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Oct 2, priced at $210 found 1 day ago

Mon, Sep 22 - Sun, Oct 5

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$239 Roundtrip, found 1 day ago

$239

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Mon, Sep 22 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 5, priced at $239 found 1 day ago

Sun, Sep 28 - Sun, Oct 5

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$240 Roundtrip, found 1 day ago

$240

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sun, Sep 28 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 5, priced at $240 found 1 day ago

Mon, Sep 22 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$249 Roundtrip, found 1 day ago

$249

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Mon, Sep 22 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Oct 4, priced at $249 found 1 day ago

Thu, Oct 9 - Fri, Oct 17

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$254 Roundtrip, found 1 day ago

$254

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 $254 found 1 day ago

Mon, Sep 22 - Thu, Oct 2

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$259 Roundtrip, found 1 day ago

$259

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Mon, Sep 22 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Oct 2, priced at $259 found 1 day ago

Wed, Oct 8 - Sun, Oct 19

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$262 Roundtrip, found 1 day ago

$262

Roundtrip

found 1 day ago

Select American Airlines flight, departing Wed, Oct 8 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 19, priced at $262 found 1 day ago

Fri, Sep 26 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$269 Roundtrip, found 1 day ago

$269

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Fri, Sep 26 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Oct 4, priced at $269 found 1 day ago

Mon, Oct 6 - Tue, Oct 21

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$275 Roundtrip, found 1 day ago

$275

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 $275 found 1 day ago

Fri, Sep 26 - Thu, Oct 2

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$279 Roundtrip, found 1 day ago

$279

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Fri, Sep 26 from Lambert-St. Louis Intl. to Logan Intl., returning Thu, Oct 2, priced at $279 found 1 day ago

Sun, Oct 5 - Tue, Oct 21

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$295 Roundtrip, found 1 day ago

$295

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Sun, Oct 5 from Lambert-St. Louis Intl. to Logan Intl., returning Tue, Oct 21, priced at $295 found 1 day ago

Mon, Oct 6 - Fri, Oct 17

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$302 Roundtrip, found 1 day ago

$302

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Mon, Oct 6 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Oct 17, priced at $302 found 1 day ago

Tue, Sep 23 - Wed, Oct 1

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$309 Roundtrip, found 1 day ago

$309

Roundtrip

found 1 day ago

Select Delta flight, departing Tue, Sep 23 from Lambert-St. Louis Intl. to Logan Intl., returning Wed, Oct 1, priced at $309 found 1 day ago

Wed, Oct 8 - Sun, Oct 19

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$320 Roundtrip, found 1 day ago

$320

Roundtrip

found 1 day ago

Select American Airlines flight, departing Wed, Oct 8 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 19, priced at $320 found 1 day ago

Wed, Oct 8 - Sun, Oct 19

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$320 Roundtrip, found 1 day ago

$320

Roundtrip

found 1 day ago

Select United flight, departing Wed, Oct 8 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 19, priced at $320 found 1 day ago

Sun, Oct 5 - Mon, Oct 20

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$322 Roundtrip, found 1 day ago

$322

Roundtrip

found 1 day ago

Select Spirit Airlines flight, departing Sun, Oct 5 from Lambert-St. Louis Intl. to Logan Intl., returning Mon, Oct 20, priced at $322 found 1 day ago

Tue, Sep 23 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$325 Roundtrip, found 1 day ago

$325

Roundtrip

found 1 day ago

Select Delta flight, departing Tue, Sep 23 from Lambert-St. Louis Intl. to Logan Intl., returning Sat, Oct 4, priced at $325 found 1 day ago

Wed, Oct 8 - Sun, Oct 19

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$359 Roundtrip, found 1 day ago

$359

Roundtrip

found 1 day ago

Select American Airlines flight, departing Wed, Oct 8 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 19, priced at $359 found 1 day ago

Wed, Oct 8 - Sun, Oct 19

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$422 Roundtrip, found 1 day ago

$422

Roundtrip

found 1 day ago

Select American Airlines flight, departing Wed, Oct 8 from Lambert-St. Louis Intl. to Logan Intl., returning Sun, Oct 19, priced at $422 found 1 day ago

Fri, Oct 10 - Fri, Oct 17

STL

Lambert-St. Louis Intl.

BOS

Logan Intl.

$439 Roundtrip, found 1 day ago

$439

Roundtrip

found 1 day ago

Select United flight, departing Fri, Oct 10 from Lambert-St. Louis Intl. to Logan Intl., returning Fri, Oct 17, priced at $439 found 1 day ago