
$136 Cheap Frontier Airlines flights from Philadelphia to St. Louis (PHL to STL)
Find The Best Day To Fly from Philadelphia to St. Louis
Amazing Frontier Airlines PHL to STL Flight Deals
The cheapest flights to Lambert-St. Louis Intl. found within the past 7 days were $208 round trip and $136 one way. Prices and availability subject to change. Additional terms may apply.
STL From PHL Economy Coach Packages on Similar Airlines



Discover our best Frontier Airlines flight from Philadelphia PHL to St. Louis STL
To find the best deals on flights to Philadelphia from St. Louis with Frontier Airlines, just enter your travel dates, filter by Frontier Airlines, and hit search. You’ll find flights to choose from and can sort by price, flight duration, and arrival or departure time.
Return flights from Philadelphia PHL to St. Louis STL with Frontier Airlines
If you’re planning a round trip, booking return flights with Frontier Airlines is usually the most cost-effective option. With airfares ranging from $208 to $298, it’s easy to find a flight that suits your budget. Prices and availability subject to change. Additional terms may apply.
Book one-way Frontier Airlines flights from Philadelphia PHL to St. Louis STL
A one-way ticket gives you much greater flexibility—allowing you to choose your return date, destination, and time whenever you’re ready. By booking in advance you can find great deals on one-way tickets too. Right now, a one-way Frontier Airlines flight from Philadelphia to St. Louis costs from $136. Prices and availability subject to change. Additional terms may apply.
The easy way to find cheap flights to St. Louis STL from Philadelphia PHL with Frontier Airlines
To find a cheap Frontier Airlines flight from Philadelphia PHL to St. Louis STL, sort your search results by price or filter by budget. Thanks to Travelocity’s Price Match Promise, if you find a better airfare deal anywhere else within 24 hours, we’ll credit or refund the difference.
How to find our best airfare deals on Frontier Airlines flights from Philadelphia PHL to St. Louis STL
If you’re looking for cheap flights, it helps to be flexible when it comes to your travel dates. You’ll usually find lower cost tickets when you travel during quieter months such as July, or if you book a flight with a stopover.
Find nonstop flights from Philadelphia PHL to St. Louis STL with Frontier Airlines
If you’re keen to be on St. Louis soil fast, don’t waste time with a stopover—filter your search results to show direct Frontier Airlines flights only. The journey takes around hour(s) min(s) – so you’ll be there before you know it.
Flexible airline tickets for Frontier Airlines flights from Philadelphia PHL to St. Louis STL
Make sure you’re not out of pocket if plans change by choosing a flexible ticket with penalty-free amendment and cancellation options. Use our ‘no change fee’ filter to see which flights have this option.
There are a lot of reasons to book your flights to St. Louis STL from Philadelphia PHL with Frontier Airlines on Travelocity
At Travelocity our vast and up-to-the-minute inventory puts all of our best flight deals in one place. So, whether you’re traveling on business or jetting off with friends and family, you can trust Travelocity to get you there.
Airport code | Country | Airport name | Number of flights |
---|---|---|---|
DEN | USA | Denver Intl. | 13 |
MCO | USA | Orlando Intl. | 7 |
CUN | MEX | Cancun Intl. | 6 |
GDL | MEX | Don Miguel Hidalgo y Costilla Intl. | 5 |
PHL | USA | Philadelphia Intl. | 2 |
ORD | USA | O'Hare Intl. | 2 |
MIA | USA | Miami Intl. | 1 |
LAS | USA | McCarran Intl. | 1 |
MEX | MEX | Mexico City Intl. | 1 |
LAX | USA | Los Angeles Intl. | 1 |
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Popular Frontier Airlines Flight Routes from PHL
Top Frontier Airlines Flight Routes from STL
Domestic
- Newark Liberty Intl. Airport to San Juan (EWR - SJU)
- Dallas to New York (DFW - LGA)
- Atlanta to New York (ATL - LGA)
- New York to Miami (JFK - MIA)
- San Francisco to New York (SFO - JFK)
- Los Angeles to Newark Liberty Intl. Airport (LAX - EWR)
- Los Angeles to Las Vegas (LAX - LAS)
- Los Angeles to New York (LAX - LGA)
- New York to Orlando (LGA - MCO)
- New York to Orlando (JFK - MCO)
International
- Dallas to Las Vegas (DFW - LAS)
- New York to San Juan (JFK - SJU)
- Baltimore to San Juan (BWI - SJU)
- Los Angeles to New York (LAX - LGA)
- Los Angeles to Newark Liberty Intl. Airport (LAX - EWR)
- Newark Liberty Intl. Airport to Orlando (EWR - MCO)
- Baltimore to San Juan (BWI - SJU)
- Atlanta to Fort Lauderdale (ATL - FLL)
- Newark Liberty Intl. Airport to Atlanta (EWR - ATL)
- San Francisco to New York (SFO - JFK)
Most Popular
- PHL to MIA Flights
- JetBlue Airways Boston (BOS) to Orlando (MCO) flights
- JetBlue Airways Orlando (MCO) to Las Vegas (LAS) flights
- BOS to MIA Flights
- American Airlines Dallas (DFW) to Las Vegas (LAS) flights
- JetBlue Airways Boston (BOS) to Las Vegas (LAS) flights
- JFK to FLL Flights
- BWI to LAS Flights
- DFW to ATL Flights
- BOS to LAX Flights
- PHL to ATL Flights
- Delta Atlanta (ATL) to Las Vegas (LAS) flights
- DFW to MCO Flights
- LAX to DFW Flights
- ORD to DFW Flights
- DFW to DEN Flights
- DFW to ORD Flights
- BOS to DCA Flights
- Delta Minneapolis - St. Paul (MSP) to Las Vegas (LAS) flights
- PDX to LAS Flights
- PHL to TPA Flights
- PHL to MCO Flights
- LAX to BOS Flights
- JetBlue Airways Boston (BOS) to San Juan (SJU) flights
- Delta Detroit (DTW) to Las Vegas (LAS) flights
- ATL to DFW Flights
- DFW to MIA Flights
- CLE to MCO Flights
- LAX to SEA Flights
- DFW to LAX Flights