Flights from New Castle to St. Louis

Cheapest flights from New Castle

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.

Sat, May 24 - Wed, May 28

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$162 Roundtrip, found 8 hours ago

$162

Roundtrip

found 8 hours ago

Select Frontier Airlines flight, departing Sat, May 24 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Wed, May 28, priced at $162 found 8 hours ago

Fri, May 30 - Mon, Jun 2

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$200 Roundtrip, found 8 hours ago

$200

Roundtrip

found 8 hours ago

Select Frontier Airlines flight, departing Fri, May 30 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Mon, Jun 2, priced at $200 found 8 hours ago

Sun, May 25 - Wed, May 28

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$210 Roundtrip, found 8 hours ago

$210

Roundtrip

found 8 hours ago

Select Frontier Airlines flight, departing Sun, May 25 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Wed, May 28, priced at $210 found 8 hours ago

Sun, May 25 - Sat, May 31

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$220 Roundtrip, found 8 hours ago

$220

Roundtrip

found 8 hours ago

Select Frontier Airlines flight, departing Sun, May 25 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sat, May 31, priced at $220 found 8 hours ago

Sat, May 24 - Sun, Jun 1

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$226 Roundtrip, found 8 hours ago

$226

Roundtrip

found 8 hours ago

Select Frontier Airlines flight, departing Sat, May 24 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sun, Jun 1, priced at $226 found 8 hours ago

Sun, May 25 - Tue, May 27

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$230 Roundtrip, found 8 hours ago

$230

Roundtrip

found 8 hours ago

Select Frontier Airlines flight, departing Sun, May 25 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Tue, May 27, priced at $230 found 8 hours ago

Fri, May 30 - Sun, Jun 1

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$240 Roundtrip, found 8 hours ago

$240

Roundtrip

found 8 hours ago

Select Frontier Airlines flight, departing Fri, May 30 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sun, Jun 1, priced at $240 found 8 hours ago

Sun, May 25 - Sun, Jun 1

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$250 Roundtrip, found 8 hours ago

$250

Roundtrip

found 8 hours ago

Select Frontier Airlines flight, departing Sun, May 25 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sun, Jun 1, priced at $250 found 8 hours ago

Mon, May 26 - Sun, Jun 1

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$271 Roundtrip, found 8 hours ago

$271

Roundtrip

found 8 hours ago

Select Frontier Airlines flight, departing Mon, May 26 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sun, Jun 1, priced at $271 found 8 hours ago

Tue, May 27 - Tue, May 27

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$271 Roundtrip, found 8 hours ago

$271

Roundtrip

found 8 hours ago

Select Delta flight, departing Tue, May 27 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Tue, May 27, priced at $271 found 8 hours ago

Thu, Jul 3 - Sat, Jul 5

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$292 Roundtrip, found 3 days ago

$292

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Thu, Jul 3 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sat, Jul 5, priced at $292 found 3 days ago

Thu, May 29 - Thu, May 29

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$303 Roundtrip, found 8 hours ago

$303

Roundtrip

found 8 hours ago

Select Delta flight, departing Thu, May 29 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, May 29, priced at $303 found 8 hours ago

Thu, Jun 19 - Fri, Jun 20

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$311 Roundtrip, found 3 days ago

$311

Roundtrip

found 3 days ago

Select Spirit Airlines flight, departing Thu, Jun 19 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Fri, Jun 20, priced at $311 found 3 days ago

Tue, Jun 17 - Tue, Jun 17

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$321 Roundtrip, found 3 days ago

$321

Roundtrip

found 3 days ago

Select Delta flight, departing Tue, Jun 17 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Tue, Jun 17, priced at $321 found 3 days ago

Sun, Jun 29 - Fri, Jul 11

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$327 Roundtrip, found 3 days ago

$327

Roundtrip

found 3 days ago

Select Spirit Airlines flight, departing Sun, Jun 29 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Fri, Jul 11, priced at $327 found 3 days ago

Fri, May 30 - Fri, May 30

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$335 Roundtrip, found 8 hours ago

$335

Roundtrip

found 8 hours ago

Select Delta flight, departing Fri, May 30 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Fri, May 30, priced at $335 found 8 hours ago

Fri, Jun 20 - Sun, Jun 22

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$337 Roundtrip, found 15 hours ago

$337

Roundtrip

found 15 hours ago

Select American Airlines flight, departing Fri, Jun 20 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sun, Jun 22, priced at $337 found 15 hours ago

Mon, Jun 30 - Sat, Jul 5

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$342 Roundtrip, found 3 days ago

$342

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Mon, Jun 30 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sat, Jul 5, priced at $342 found 3 days ago

Fri, Jun 20 - Sun, Jun 22

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$366 Roundtrip, found 15 hours ago

$366

Roundtrip

found 15 hours ago

Select American Airlines flight, departing Fri, Jun 20 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sun, Jun 22, priced at $366 found 15 hours ago

Fri, Jun 20 - Sun, Jun 22

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$465 Roundtrip, found 15 hours ago

$465

Roundtrip

found 15 hours ago

Select United flight, departing Fri, Jun 20 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sun, Jun 22, priced at $465 found 15 hours ago