S$ 28 Cheap Flights from St. Louis to Philadelphia (STL-PHL)

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Cheap Flights from St. Louis to Philadelphia starting at S$ 28

Book one-way or return flights from St. Louis to Philadelphia from as little as S$ 28. Choose from the popular airlines below and book your flight today!

One way
Round-trip

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

Searching for the best last minute flight from St. Louis to Philadelphia? Find one-way or return flights that are affordable and fit your itinerary.

Trip.com monitors the ticket fares of flights from St. Louis to Philadelphia. Stay updated on price trends and snag the best deals for your upcoming trip.

Displayed prices are calculated based on the lowest average weekly prices of the corresponding route on Trip.com.

Cheapest Airlines flying from St. Louis to Philadelphia

View airlines operating flights from St. Louis to Philadelphia. Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Frontier Airlines

From S$ 28

Sun Country Airlines

From S$ 81

American Airlines

From S$ 120

Delta Air Lines

From S$ 126

United Airlines

From S$ 161

Spirit Airlines

From S$ 179

Southwest Airlines

From S$ 223

Southern Airways Express, Llc

From S$ 254

Alaska Airlines

From S$ 361

ANA airlines

Find more flights and airlines

Alternative Routes from St. Louis to Philadelphia

Discover different routes, airlines, and transfers and find the best alternative flights for your journey from St. Louis to Philadelphia.

Cheapest
STL
08:47
2h 14m
Direct
PHL
12:01
St. Louis Lambert International Airport - Philadelphia International Airport
Wed, May 22Frontier Airlines
S$ 28
STL
17:56
20h 17m
1 transfer
TTN
15:13
St. Louis Lambert International Airport - Trenton Mercer Airport
Wed, May 15Frontier Airlines
S$ 72
STL
17:56
20h 17m
1 transfer
TTN
15:13
St. Louis Lambert International Airport - Trenton Mercer Airport
Wed, May 15Frontier Airlines
S$ 72
Find More Flights

Frequently Asked Questions

When to buy flight tickets from St. Louis (STL) to Philadelphia (PHL) the cheapest?
Airlines adjust prices for flights from St. Louis to Philadelphia based on the date and time of your booking. By analyzing data from all airlines, on Trip.com, you can find the cheapest flight prices on Tuesdays, Wednesdays, and Saturdays.
How much is a flight from St. Louis (STL) to Philadelphia (PHL) cost?
According to Trip.com's data, the lowest price is around S$ 430.
How long is a flight from St. Louis (STL) to Philadelphia (PHL)?
It takes about 2 hours 9 minutes to fly from St. Louis (STL) to Philadelphia (PHL).
What time does the earliest flight from St. Louis to Philadelphia depart?
The earliest flight departs from St. Louis (STL) at 06:15 and arrives in Philadelphia (PHL) at 09:22.
What are the most popular airlines that fly from St. Louis (STL) to Philadelphia (PHL)?
Airlines with flights from St. Louis (STL) to Philadelphia (PHL): American Airlines, Southwest Airlines, Qatar Airways, Aer Lingus, British Airways and IBERIA.
What's the most popular airline for direct flights from St. Louis (STL) to Philadelphia (PHL)?
American Airlines operates 2 direct flights from St. Louis (STL) to Philadelphia (PHL).
How many airports in Philadelphia?
There are 5 airports near Philadelphia: Philadelphia International Airport, Philadelphia Wings Field, Northeast Philadelphia Airport, Essington Spb and Trenton Mercer Airport.

How to find a cheap flight from St. Louis to Philadelphia

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from St. Louis to Philadelphia. Book your flights at the right time and save more.

Book Early

Once prices are gone, they're gone. Lock in deals while you can!

Compare Flight Prices

Compare prices on travel agency and airline websites.

Look Out for Deals

Check airline and travel agency websites for latest flight deals

Check One-way Fares

Buying two cheap one-way flights can sometimes be a better deal than a round-trip.

Try Different Dates

Flying during the week, early in the morning, or late at night can help save money.

Use the Trip.com App

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Flight Information from St. Louis to Philadelphia

Cheapest direct flight price	S$ 28
Cheapest return ticket price	S$ 77
Cheapest month	May
Peak season for travel	August
Flight distance	1,293.47km
Average flight time	2 hours 9 minutes
Popular airline	American Airlines