$149 Cheap Frontier Airlines flights Philadelphia (PHL) to St. Louis (STL)

$149 Cheap Frontier Airlines flights Philadelphia (PHL) to St. Louis (STL)

Prices were available within the past 7 days and start at $149 for one-way flights and $228 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Oct 2 - Sun, Oct 5

PHL

Philadelphia

STL

St. Louis

$228 Roundtrip, found 19 hours ago

$228

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Thu, Oct 2 from Philadelphia to St. Louis, returning Sun, Oct 5, priced at $228 found 19 hours ago

Fri, Oct 3 - Wed, Oct 8

PHL

Philadelphia

STL

St. Louis

$296 Roundtrip, found 19 hours ago

$296

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Fri, Oct 3 from Philadelphia to St. Louis, returning Wed, Oct 8, priced at $296 found 19 hours ago

Fri, Oct 3 - Mon, Oct 6

PHL

Philadelphia

STL

St. Louis

$302 Roundtrip, found 19 hours ago

$302

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Fri, Oct 3 from Philadelphia to St. Louis, returning Mon, Oct 6, priced at $302 found 19 hours ago