$166 Cheap Frontier Airlines flights St. Louis (STL) to Philadelphia (PHL)

$166 Cheap Frontier Airlines flights St. Louis (STL) to Philadelphia (PHL)

Prices were available within the past 7 days and start at $166 for one-way flights and $421 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Aug 13 - Sat, Aug 16

STL

St. Louis

PHL

Philadelphia

$421 Roundtrip, found 19 hours ago

$421

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Wed, Aug 13 from St. Louis to Philadelphia, returning Sat, Aug 16, priced at $421 found 19 hours ago