Flights from Philadelphia to Alton

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.

Thu, Aug 28 - Sun, Aug 31

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$199 Roundtrip, found 3 hours ago

$199

Roundtrip

found 3 hours ago

Select Spirit Airlines flight, departing Thu, Aug 28 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sun, Aug 31, priced at $199 found 3 hours ago

Mon, Aug 25 - Fri, Aug 29

TTN

Mercer

STL

Lambert-St. Louis Intl.

$223 Roundtrip, found 3 hours ago

$223

Roundtrip

found 3 hours ago

Select Frontier Airlines flight, departing Mon, Aug 25 from Mercer to Lambert-St. Louis Intl., returning Fri, Aug 29, priced at $223 found 3 hours ago

Fri, Aug 22 - Thu, Aug 28

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$224 Roundtrip, found 3 hours ago

$224

Roundtrip

found 3 hours ago

Select Spirit Airlines flight, departing Fri, Aug 22 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, Aug 28, priced at $224 found 3 hours ago

Sat, Aug 23 - Wed, Aug 27

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$228 Roundtrip, found 3 hours ago

$228

Roundtrip

found 3 hours ago

Select Frontier Airlines flight, departing Sat, Aug 23 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Wed, Aug 27, priced at $228 found 3 hours ago

Sun, Sep 21 - Thu, Oct 2

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$229 Roundtrip, found 4 days ago

$229

Roundtrip

found 4 days ago

Select American Airlines flight, departing Sun, Sep 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, Oct 2, priced at $229 found 4 days ago

Sun, Sep 21 - Thu, Oct 2

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$233 Roundtrip, found 4 days ago

$233

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Sun, Sep 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, Oct 2, priced at $233 found 4 days ago

Sun, Sep 21 - Thu, Oct 2

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$234 Roundtrip, found 4 days ago

$234

Roundtrip

found 4 days ago

Select American Airlines flight, departing Sun, Sep 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, Oct 2, priced at $234 found 4 days ago

Tue, Sep 23 - Tue, Sep 30

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$237 Roundtrip, found 4 days ago

$237

Roundtrip

found 4 days ago

Select Delta flight, departing Tue, Sep 23 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Tue, Sep 30, priced at $237 found 4 days ago

Fri, Aug 22 - Wed, Aug 27

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$238 Roundtrip, found 3 hours ago

$238

Roundtrip

found 3 hours ago

Select Frontier Airlines flight, departing Fri, Aug 22 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Wed, Aug 27, priced at $238 found 3 hours ago

Sun, Sep 21 - Thu, Oct 2

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$239 Roundtrip, found 4 days ago

$239

Roundtrip

found 4 days ago

Select American Airlines flight, departing Sun, Sep 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, Oct 2, priced at $239 found 4 days ago

Mon, Aug 25 - Fri, Aug 29

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$243 Roundtrip, found 3 hours ago

$243

Roundtrip

found 3 hours ago

Select Frontier Airlines flight, departing Mon, Aug 25 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Fri, Aug 29, priced at $243 found 3 hours ago

Sun, Sep 21 - Thu, Oct 2

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$244 Roundtrip, found 4 days ago

$244

Roundtrip

found 4 days ago

Select American Airlines flight, departing Sun, Sep 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, Oct 2, priced at $244 found 4 days ago

Sun, Aug 24 - Thu, Aug 28

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$248 Roundtrip, found 3 hours ago

$248

Roundtrip

found 3 hours ago

Select Frontier Airlines flight, departing Sun, Aug 24 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, Aug 28, priced at $248 found 3 hours ago

Tue, Aug 26 - Sat, Aug 30

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$253 Roundtrip, found 3 hours ago

$253

Roundtrip

found 3 hours ago

Select American Airlines flight, departing Tue, Aug 26 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sat, Aug 30, priced at $253 found 3 hours ago

Sat, Aug 16 - Tue, Aug 26

ABE

Lehigh Valley Intl.

STL

Lambert-St. Louis Intl.

$254 Roundtrip, found 3 days ago

$254

Roundtrip

found 3 days ago

Select Delta flight, departing Sat, Aug 16 from Lehigh Valley Intl. to Lambert-St. Louis Intl., returning Tue, Aug 26, priced at $254 found 3 days ago

Sun, Sep 21 - Thu, Oct 2

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$254 Roundtrip, found 4 days ago

$254

Roundtrip

found 4 days ago

Select United flight, departing Sun, Sep 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, Oct 2, priced at $254 found 4 days ago

Mon, Aug 25 - Fri, Aug 29

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$258 Roundtrip, found 3 hours ago

$258

Roundtrip

found 3 hours ago

Select Spirit Airlines flight, departing Mon, Aug 25 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Fri, Aug 29, priced at $258 found 3 hours ago

Sun, Sep 21 - Thu, Oct 2

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$261 Roundtrip, found 4 days ago

$261

Roundtrip

found 4 days ago

Select American Airlines flight, departing Sun, Sep 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, Oct 2, priced at $261 found 4 days ago

Tue, Aug 26 - Sat, Aug 30

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$262 Roundtrip, found 3 hours ago

$262

Roundtrip

found 3 hours ago

Select American Airlines flight, departing Tue, Aug 26 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Sat, Aug 30, priced at $262 found 3 hours ago

Sun, Sep 21 - Thu, Oct 2

PHL

Philadelphia Intl.

STL

Lambert-St. Louis Intl.

$264 Roundtrip, found 4 days ago

$264

Roundtrip

found 4 days ago

Select American Airlines flight, departing Sun, Sep 21 from Philadelphia Intl. to Lambert-St. Louis Intl., returning Thu, Oct 2, priced at $264 found 4 days ago