Flights from Philadelphia to St. Louis

Cheapest flights from Philadelphia

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.

Mon, Jul 21 - Wed, Jul 23

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$198 Roundtrip, found 4 days ago

$198

Roundtrip

found 4 days ago

Select Spirit Airlines flight, departing Mon, Jul 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Wed, Jul 23, priced at $198 found 4 days ago

Mon, Jul 21 - Thu, Jul 24

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$213 Roundtrip, found 4 days ago

$213

Roundtrip

found 4 days ago

Select Spirit Airlines flight, departing Mon, Jul 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, Jul 24, priced at $213 found 4 days ago

Mon, Jul 21 - Wed, Jul 23

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$224 Roundtrip, found 4 days ago

$224

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Mon, Jul 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Wed, Jul 23, priced at $224 found 4 days ago

Sat, Jun 21 - Wed, Jun 25

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$224 Roundtrip, found 2 days ago

$224

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Sat, Jun 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Wed, Jun 25, priced at $224 found 2 days ago

Mon, Jul 21 - Fri, Jul 25

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$227 Roundtrip, found 4 days ago

$227

Roundtrip

found 4 days ago

Select Spirit Airlines flight, departing Mon, Jul 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Fri, Jul 25, priced at $227 found 4 days ago

Sun, Jul 20 - Thu, Jul 24

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$228 Roundtrip, found 4 days ago

$228

Roundtrip

found 4 days ago

Select Spirit Airlines flight, departing Sun, Jul 20 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, Jul 24, priced at $228 found 4 days ago

Sat, Jun 21 - Mon, Jun 23

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$236 Roundtrip, found 2 days ago

$236

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Sat, Jun 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Mon, Jun 23, priced at $236 found 2 days ago

Tue, Jul 22 - Sun, Jul 27

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$241 Roundtrip, found 4 days ago

$241

Roundtrip

found 4 days ago

Select Spirit Airlines flight, departing Tue, Jul 22 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sun, Jul 27, priced at $241 found 4 days ago

Sun, Jul 20 - Fri, Jul 25

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$242 Roundtrip, found 4 days ago

$242

Roundtrip

found 4 days ago

Select Spirit Airlines flight, departing Sun, Jul 20 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Fri, Jul 25, priced at $242 found 4 days ago

Sat, Jun 21 - Sat, Jun 21

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$247 Roundtrip, found 2 days ago

$247

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Sat, Jun 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sat, Jun 21, priced at $247 found 2 days ago

Fri, Jun 20 - Sat, Jun 21

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$248 Roundtrip, found 2 days ago

$248

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Fri, Jun 20 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sat, Jun 21, priced at $248 found 2 days ago

Thu, Jun 19 - Sun, Jun 22

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$249 Roundtrip, found 2 days ago

$249

Roundtrip

found 2 days ago

Select Spirit Airlines flight, departing Thu, Jun 19 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sun, Jun 22, priced at $249 found 2 days ago

Thu, Jun 19 - Sat, Jun 21

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$259 Roundtrip, found 2 days ago

$259

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Thu, Jun 19 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sat, Jun 21, priced at $259 found 2 days ago

Tue, Jun 17 - Sat, Jun 21

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$260 Roundtrip, found 2 days ago

$260

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Tue, Jun 17 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sat, Jun 21, priced at $260 found 2 days ago

Mon, Jul 21 - Wed, Jul 23

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$267 Roundtrip, found 4 days ago

$267

Roundtrip

found 4 days ago

Select Spirit Airlines flight, departing Mon, Jul 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Wed, Jul 23, priced at $267 found 4 days ago

Tue, Jun 17 - Wed, Jun 18

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$271 Roundtrip, found 3 days ago

$271

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Tue, Jun 17 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Wed, Jun 18, priced at $271 found 3 days ago

Sun, Jun 22 - Mon, Jun 23

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$279 Roundtrip, found 2 days ago

$279

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Sun, Jun 22 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Mon, Jun 23, priced at $279 found 2 days ago

Wed, Aug 13 - Wed, Aug 13

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$337 Roundtrip, found 2 days ago

$337

Roundtrip

found 2 days ago

Select American Airlines flight, departing Wed, Aug 13 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Wed, Aug 13, priced at $337 found 2 days ago

Wed, Aug 13 - Wed, Aug 13

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$353 Roundtrip, found 2 days ago

$353

Roundtrip

found 2 days ago

Select Delta flight, departing Wed, Aug 13 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Wed, Aug 13, priced at $353 found 2 days ago

Mon, Jul 21 - Wed, Jul 23

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$397 Roundtrip, found 4 days ago

$397

Roundtrip

found 4 days ago

Select United flight, departing Mon, Jul 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Wed, Jul 23, priced at $397 found 4 days ago