$156 Cheap Frontier Airlines flights St. Louis (STL) to Philadelphia (PHL)

$156 Cheap Frontier Airlines flights St. Louis (STL) to Philadelphia (PHL)

Prices were available within the past 7 days and start at $156 for one-way flights and $292 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Jul 19 - Sun, Jul 27

STL

St. Louis

PHL

Philadelphia

$292 Roundtrip, found 19 hours ago

$292

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Sat, Jul 19 from St. Louis to Philadelphia, returning Sun, Jul 27, priced at $292 found 19 hours ago

Sun, Jul 20 - Sun, Jul 27

STL

St. Louis

PHL

Philadelphia

$312 Roundtrip, found 19 hours ago

$312

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Sun, Jul 20 from St. Louis to Philadelphia, returning Sun, Jul 27, priced at $312 found 19 hours ago

Sat, Jul 19 - Wed, Jul 23

STL

St. Louis

PHL

Philadelphia

$342 Roundtrip, found 19 hours ago

$342

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Sat, Jul 19 from St. Louis to Philadelphia, returning Wed, Jul 23, priced at $342 found 19 hours ago

Mon, Jul 21 - Fri, Jul 25

STL

St. Louis

PHL

Philadelphia

$355 Roundtrip, found 19 hours ago

$355

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Mon, Jul 21 from St. Louis to Philadelphia, returning Fri, Jul 25, priced at $355 found 19 hours ago

Mon, Jul 21 - Fri, Jul 25

STL

St. Louis

PHL

Philadelphia

$374 Roundtrip, found 19 hours ago

$374

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Mon, Jul 21 from St. Louis to Philadelphia, returning Fri, Jul 25, priced at $374 found 19 hours ago

Mon, Jul 21 - Fri, Jul 25

STL

St. Louis

PHL

Philadelphia

$392 Roundtrip, found 19 hours ago

$392

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Mon, Jul 21 from St. Louis to Philadelphia, returning Fri, Jul 25, priced at $392 found 19 hours ago

Mon, Jul 21 - Fri, Jul 25

STL

St. Louis

PHL

Philadelphia

$405 Roundtrip, found 19 hours ago

$405

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Mon, Jul 21 from St. Louis to Philadelphia, returning Fri, Jul 25, priced at $405 found 19 hours ago

Fri, Jul 18 - Thu, Jul 24

STL

St. Louis

PHL

Philadelphia

$412 Roundtrip, found 19 hours ago

$412

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Fri, Jul 18 from St. Louis to Philadelphia, returning Thu, Jul 24, priced at $412 found 19 hours ago