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Flights from St. Louis to Philadelphia
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Cheap flight deals from St. Louis to Philadelphia Starting at PHP 3,163

Whether you’re going for a one-way or round-trip to Philadelphia, we’ve got you covered! Check out these different flight options from St. Louis below.

  • One way
  • Round-trip
      • Cheapest nonstop
        STL18:05
        2h 5m
        Nonstop
        PHL21:10
        Wed, Feb 19|St. Louis - Philadelphia|Southwest Airlines
        PHP 9,347PHP 13,163
        28% OFF
        28% OFF
        PHP 13,163PHP 9,347

        Choose Southwest Airlines flights from St. Louis to Philadelphia. The one-way direct flight with Southwest Airlines departs from St. Louis Lambert International Airport on Wed, Feb 19, arriving at Philadelphia International Airport. One-way Prices start from PHP 9,347 including taxes and charges.

      • STL18:05
        2h 5m
        Nonstop
        PHL21:10
        Wed, Mar 5|St. Louis - Philadelphia|Southwest Airlines
        PHP 10,135PHP 13,163
        23% OFF
        23% OFF
        PHP 13,163PHP 10,135

        Choose Southwest Airlines flights from St. Louis to Philadelphia. The one-way direct flight with Southwest Airlines departs from St. Louis Lambert International Airport on Wed, Mar 5, arriving at Philadelphia International Airport. One-way Prices start from PHP 10,135 including taxes and charges.

      • STL19:04
        8h 21m
        1 stop
        PHL04:25
        Wed, Mar 5|St. Louis - Philadelphia|Frontier Airlines
        PHP 3,163PHP 13,163
        76% OFF
        76% OFF
        PHP 13,163PHP 3,163

        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, Mar 5, arriving at Philadelphia International Airport. One-way Prices start from PHP 3,163 including taxes and charges.

      • STL17:20
        13h 10m
        1 stop
        PHL07:30
        Tue, Feb 25|St. Louis - Philadelphia|Frontier Airlines
        PHP 3,418
        PHP 3,418

        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, Feb 25, arriving at Philadelphia International Airport. One-way Prices start from PHP 3,418 including taxes and charges.

      • STL23:08
        30h 6m
        1 stop
        PHL06:14
        Thu, Feb 27|St. Louis - Philadelphia|Frontier Airlines
        PHP 3,442
        PHP 3,442

        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, Feb 27, arriving at Philadelphia International Airport. One-way Prices start from PHP 3,442 including taxes and charges.

      • STL19:04
        15h 35m
        1 stop
        PHL11:39
        Sat, Mar 1|St. Louis - Philadelphia|Frontier Airlines
        PHP 3,498
        PHP 3,498

        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, Mar 1, arriving at Philadelphia International Airport. One-way Prices start from PHP 3,498 including taxes and charges.

      • STL17:20
        13h 10m
        1 stop
        PHL07:30
        Wed, Feb 26|St. Louis - Philadelphia|Frontier Airlines
        PHP 3,657
        PHP 3,657

        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, Feb 26, arriving at Philadelphia International Airport. One-way Prices start from PHP 3,657 including taxes and charges.

      • STL17:20
        20h 58m
        1 stop
        PHL15:18
        Tue, Mar 4|St. Louis - Philadelphia|Frontier Airlines
        PHP 3,689
        PHP 3,689

        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, Mar 4, arriving at Philadelphia International Airport. One-way Prices start from PHP 3,689 including taxes and charges.

      • STL23:08
        30h 6m
        1 stop
        PHL06:14
        Thu, Feb 20|St. Louis - Philadelphia|Frontier Airlines
        PHP 3,713
        PHP 3,713

        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, Feb 20, arriving at Philadelphia International Airport. One-way Prices start from PHP 3,713 including taxes and charges.

      • STL19:04
        15h 35m
        1 stop
        PHL11:39
        Sat, Feb 15|St. Louis - Philadelphia|Frontier Airlines
        PHP 3,721
        PHP 3,721

        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, Feb 15, arriving at Philadelphia International Airport. One-way Prices start from PHP 3,721 including taxes and charges.

      • STL01:00 pm
        3h 5m
        Nonstop
        PHL02:00 pm
        Sat, Feb 22|St. Louis - Philadelphia|Southwest Airlines
        Find More Flights
        Find More Flights

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

St. Louis to Philadelphia flight time & flight schedules

Flight info.
Departure
Arrival
Weekly Schedule

  1. F93641

    Frontier Airlines

    13:06

    STL

    3.8h

    14:51

    LAS

    SMTW-F-
    Search

  2. F91602

    Frontier Airlines

    23:00

    LAS

    4.9h

    06:52

    PHL

    SMTWTFS

  3. F92636

    Frontier Airlines

    17:20

    STL

    2.5h

    20:51

    MCO

    SMTWTFS
    Search

  4. F93856

    Frontier Airlines

    15:18

    MCO

    2.7h

    17:59

    PHL

    SMTWTFS

  5. F92636

    Frontier Airlines

    17:20

    STL

    2.5h

    20:51

    MCO

    SMTWTFS
    Search

  6. F92014

    Frontier Airlines

    10:20

    MCO

    2.6h

    12:57

    TTN

    SMTWTFS

  7. F92636

    Frontier Airlines

    17:20

    STL

    2.5h

    20:51

    MCO

    SMTWTFS
    Search

  8. F91542

    Frontier Airlines

    05:01

    MCO

    2.5h

    07:30

    PHL

    SMTWTFS

  9. F92630

    Frontier Airlines

    17:47

    STL

    2.5h

    21:19

    MCO

    S------
    Search

  10. F91542

    Frontier Airlines

    05:01

    MCO

    2.5h

    07:30

    PHL

    SMTWTFS

  11. F94567

    Frontier Airlines

    18:53

    STL

    2.5h

    20:22

    DEN

    S-T-TF-
    Search

  12. F93266

    Frontier Airlines

    12:00

    DEN

    3.6h

    17:37

    PHL

    SM-WTFS

  13. F94567

    Frontier Airlines

    18:53

    STL

    2.5h

    20:22

    DEN

    S-T-TF-
    Search

  14. F93340

    Frontier Airlines

    23:45

    DEN

    3.4h

    05:09

    PHL

    S---TFS

  15. F92017

    Frontier Airlines

    21:55

    STL

    3.8h

    23:41

    LAS

    S--WT-S
    Search

  16. F91602

    Frontier Airlines

    23:00

    LAS

    4.9h

    06:52

    PHL

    SMTWTFS
Find more flights and airlines

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

Explore the best time to buy affordable tickets to Philadelphia with our price trend chart, which predicts how flight prices will change in the coming weeks from previous data.

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

Frequently Asked Questions

  • 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 lowest flight prices on Tuesdays, Wednesdays, and Saturdays.

  • How much do flights from St. Louis (STL) to Philadelphia (PHL) cost?

    According to Trip.com's data, the lowest price is around PHP 18,525.

  • How long does it take to fly from St. Louis (STL) to Philadelphia (PHL)?

    It takes about 2 hours 8 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 and Iberia.

  • What's the most popular airline for non-stop flights from St. Louis (STL) to Philadelphia (PHL)?

    American Airlines operates 2 non-stop flights from St. Louis (STL) to Philadelphia (PHL).

  • How many airports are there in Philadelphia (PHL)?

    There are 2 airport(s) near Philadelphia (PHL): Philadelphia International Airport and Trenton Mercer Airport.

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

Understanding the common pitfalls when booking your flight tickets can help you save massively when it comes time to fly. We’ve listed our six essential steps to keep in mind when you’re booking flight tickets to help you find the best price.
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 Info | St. Louis to Philadelphia

Cheapest direct flight pricePHP 3,163
Cheapest return ticket pricePHP 13,123
Off-season for travelDecember
Peak season for travelMay
Flight distance1,293.47 km
Average flight time2 hours 8 minutes
Popular airlineFrontier Airlines

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