Cheap Frontier Airlines flights Philadelphia (PHL) to St. Louis (STL)

Cheap Frontier Airlines flights Philadelphia (PHL) to St. Louis (STL)

Prices were available within the past 7 days and start at for one-way flights and $150 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, May 7 - Sat, May 9

PHL

Philadelphia

STL

St. Louis

$150 Roundtrip, found 2 days ago

$150

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Thu, May 7 from Philadelphia to St. Louis, returning Sat, May 9, priced at $150 found 2 days ago

Sat, May 23 - Wed, Jun 3

PHL

Philadelphia

STL

St. Louis

$170 Roundtrip, found 17 hours ago

$170

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Sat, May 23 from Philadelphia to St. Louis, returning Wed, Jun 3, priced at $170 found 17 hours ago

Wed, May 27 - Wed, Jun 3

PHL

Philadelphia

STL

St. Louis

$190 Roundtrip, found 17 hours ago

$190

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Wed, May 27 from Philadelphia to St. Louis, returning Wed, Jun 3, priced at $190 found 17 hours ago

Sat, May 23 - Thu, May 28

PHL

Philadelphia

STL

St. Louis

$191 Roundtrip, found 17 hours ago

$191

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Sat, May 23 from Philadelphia to St. Louis, returning Thu, May 28, priced at $191 found 17 hours ago

Sun, May 24 - Wed, Jun 3

PHL

Philadelphia

STL

St. Louis

$195 Roundtrip, found 17 hours ago

$195

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Sun, May 24 from Philadelphia to St. Louis, returning Wed, Jun 3, priced at $195 found 17 hours ago

Wed, May 27 - Thu, May 28

PHL

Philadelphia

STL

St. Louis

$211 Roundtrip, found 17 hours ago

$211

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Wed, May 27 from Philadelphia to St. Louis, returning Thu, May 28, priced at $211 found 17 hours ago

Sat, May 23 - Sun, May 31

PHL

Philadelphia

STL

St. Louis

$215 Roundtrip, found 17 hours ago

$215

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Sat, May 23 from Philadelphia to St. Louis, returning Sun, May 31, priced at $215 found 17 hours ago

Sun, May 24 - Thu, May 28

PHL

Philadelphia

STL

St. Louis

$216 Roundtrip, found 17 hours ago

$216

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Sun, May 24 from Philadelphia to St. Louis, returning Thu, May 28, priced at $216 found 17 hours ago

Wed, May 27 - Sun, May 31

PHL

Philadelphia

STL

St. Louis

$235 Roundtrip, found 17 hours ago

$235

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Wed, May 27 from Philadelphia to St. Louis, returning Sun, May 31, priced at $235 found 17 hours ago

Tue, May 26 - Thu, May 28

PHL

Philadelphia

STL

St. Louis

$236 Roundtrip, found 17 hours ago

$236

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Tue, May 26 from Philadelphia to St. Louis, returning Thu, May 28, priced at $236 found 17 hours ago

Sun, May 24 - Sun, May 31

PHL

Philadelphia

STL

St. Louis

$240 Roundtrip, found 17 hours ago

$240

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Sun, May 24 from Philadelphia to St. Louis, returning Sun, May 31, priced at $240 found 17 hours ago

Mon, May 11 - Fri, May 15

PHL

Philadelphia

STL

St. Louis

$256 Roundtrip, found 2 days ago

$256

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Mon, May 11 from Philadelphia to St. Louis, returning Fri, May 15, priced at $256 found 2 days ago