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Flights from St. Louis to Philadelphia
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Find St. Louis to Philadelphia flights starting at CAD 63.

We've found these cheap flights for you. You can book one-way or return flight tickets.

  • One way
  • Round-trip
      • Cheapest nonstop
        STL06:00
        2h 12m
        Nonstop
        PHL09:12
        Tue, Dec 17|St. Louis - Philadelphia|American Airlines
        CAD 216CAD 239
        10% OFF
        10% OFF
        CAD 239CAD 216

        Choose American Airlines flights from St. Louis to Philadelphia. The one-way direct flight with American Airlines departs from St. Louis Lambert International Airport on Tue, Dec 17, arriving at Philadelphia International Airport. One-way Prices start from CAD 216 including taxes and charges.

      • STL06:30
        2h 9m
        Nonstop
        PHL09:39
        Tue, Dec 31|St. Louis - Philadelphia|American Airlines
        CAD 222CAD 239
        7% OFF
        7% OFF
        CAD 239CAD 222

        Choose American Airlines flights from St. Louis to Philadelphia. The one-way direct flight with American Airlines departs from St. Louis Lambert International Airport on Tue, Dec 31, arriving at Philadelphia International Airport. One-way Prices start from CAD 222 including taxes and charges.

      • STL15:53
        7h 40m
        1 stop
        PHL00:33
        Tue, Dec 17|St. Louis - Philadelphia|Frontier Airlines
        CAD 63CAD 239
        74% OFF
        74% OFF
        CAD 239CAD 63

        Choose Frontier Airlines flights from St. Louis to Philadelphia. The one-way connecting flight with Frontier Airlines departs from St. Louis Lambert International Airport on Tue, Dec 17, arriving at Philadelphia International Airport. One-way Prices start from CAD 63 including taxes and charges.

      • STL15:53
        6h 46m
        1 stop
        TTN23:39
        Wed, Dec 18|St. Louis - Philadelphia|Frontier Airlines
        CAD 71
        CAD 71

        Choose Frontier Airlines flights from St. Louis to Philadelphia. The one-way connecting flight with Frontier Airlines departs from St. Louis Lambert International Airport on Wed, Dec 18, arriving at Trenton Mercer Airport. One-way Prices start from CAD 71 including taxes and charges.

      • STL17:05
        5h 54m
        1 stop
        TTN23:59
        Mon, Feb 10|St. Louis - Philadelphia|Frontier Airlines
        CAD 76
        CAD 76

        Choose Frontier Airlines flights from St. Louis to Philadelphia. The one-way connecting flight with Frontier Airlines departs from St. Louis Lambert International Airport on Mon, Feb 10, arriving at Trenton Mercer Airport. One-way Prices start from CAD 76 including taxes and charges.

      • STL17:05
        13h 56m
        1 stop
        PHL08:01
        Sat, Jan 11|St. Louis - Philadelphia|Frontier Airlines
        CAD 84
        CAD 84

        Choose Frontier Airlines flights from St. Louis to Philadelphia. The one-way connecting flight with Frontier Airlines departs from St. Louis Lambert International Airport on Sat, Jan 11, arriving at Philadelphia International Airport. One-way Prices start from CAD 84 including taxes and charges.

      • STL17:05
        19h 58m
        1 stop
        PHL14:03
        Tue, Jan 7|St. Louis - Philadelphia|Frontier Airlines
        CAD 84
        CAD 84

        Choose Frontier Airlines flights from St. Louis to Philadelphia. The one-way connecting flight with Frontier Airlines departs from St. Louis Lambert International Airport on Tue, Jan 7, arriving at Philadelphia International Airport. One-way Prices start from CAD 84 including taxes and charges.

      • STL15:53
        14h 39m
        1 stop
        PHL07:32
        Sat, Jan 4|St. Louis - Philadelphia|Frontier Airlines
        CAD 84
        CAD 84

        Choose Frontier Airlines flights from St. Louis to Philadelphia. The one-way connecting flight with Frontier Airlines departs from St. Louis Lambert International Airport on Sat, Jan 4, arriving at Philadelphia International Airport. One-way Prices start from CAD 84 including taxes and charges.

      • STL17:05
        23h 46m
        1 stop
        TTN17:51
        Thu, Jan 9|St. Louis - Philadelphia|Frontier Airlines
        CAD 84
        CAD 84

        Choose Frontier Airlines flights from St. Louis to Philadelphia. The one-way connecting flight with Frontier Airlines departs from St. Louis Lambert International Airport on Thu, Jan 9, arriving at Trenton Mercer Airport. One-way Prices start from CAD 84 including taxes and charges.

      • STL07:43
        13h 11m
        1 stop
        PHL21:54
        Mon, Jan 6|St. Louis - Philadelphia|Frontier Airlines
        CAD 85
        CAD 85

        Choose Frontier Airlines flights from St. Louis to Philadelphia. The one-way connecting flight with Frontier Airlines departs from St. Louis Lambert International Airport on Mon, Jan 6, arriving at Philadelphia International Airport. One-way Prices start from CAD 85 including taxes and charges.

      • STL13:00
        3h 5m
        Nonstop
        PHL14:00
        Wed, Dec 11|St. Louis - Philadelphia|American Airlines
        Find More Flights
        Find More Flights

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

When is the cheapest time to fly from St. Louis to Philadelphia?

We monitor flight fares to help you find the best deals effortlessly

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

Find Cheapest Airlines Flying 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 CAD 63
American Airlines
From CAD 168
Delta Air Lines
From CAD 179
United Airlines
From CAD 226
Southwest Airlines
From CAD 248
Alaska Airlines
From CAD 334

Find more flights and airlines

Alternative Routes for St. Louis to Philadelphia Flights

Searching for potential routes that might be cheaper and faster? Check out these alternative flights from St. Louis to Philadelphia.

  • Cheapest
    Frontier Airlines
    STL
    15:53
    7h 40m
    1 transfer
    PHL
    00:33
    St. Louis Lambert International Airport - Philadelphia International Airport
    Tue, Dec 17Frontier Airlines
    CAD 63
  • Frontier Airlines
    STL
    15:53
    6h 46m
    1 transfer
    TTN
    23:39
    St. Louis Lambert International Airport - Trenton Mercer Airport
    Tue, Dec 17Frontier Airlines
    CAD 63
  • Frontier Airlines
    STL
    15:53
    6h 46m
    1 transfer
    TTN
    23:39
    St. Louis Lambert International Airport - Trenton Mercer Airport
    Tue, Dec 17Frontier Airlines
    CAD 63
    Find More Flights

FAQ

  • When are 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 are flights from St. Louis (STL) to Philadelphia (PHL) cost?

    According to Trip.com's data, the lowest price is around CAD 449.

  • How long is the 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 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, British Airways, Aer Lingus 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 (PHL)?

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.
1
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
2
Compare Flight Prices
Compare prices on travel agency and airline websites.
3
Look Out for Deals
Check airline and travel agency websites for latest flight deals
4
Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
5
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
6
Use the Trip.com App
Save up to £10 per person when booking your flights on Trip.com

Flight Information for St. Louis to Philadelphia Flights

Cheapest direct flight priceCAD 63
Cheapest return ticket priceCAD 338
Off-season travel monthDecember
Peak season for travelFebruary
Flight distance1,293.47km
Average flight time2 hours 9 minutes
Popular airlineAmerican Airlines

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