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$54+ Cheap flights from St. Louis to Philadelphia (STL - PHL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Nov 23 — Nov 301
Sun 11/23
Sun 11/30
1 adult, Economy
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Find cheap flights from St. Louis to Philadelphia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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Cheapflights Tip: The best prices from Lambert-St Louis to Philadelphia are usually found in August or September, booked 76 days in advance, depart on a Thursday or Friday and return on a Wednesday

Cheap flight deals from St. Louis to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Philadelphia (PHL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 24, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$150
(Flightnetwork)

One-way from

$54
(Kiwi.com)

Popular in

March

Cheapest in

August

Average price

$390

Good round-trip deal

$394 or less

Good one-way deal

$221 or less
Provider with most accurate pricing for Lambert-St Louis-Philadelphia flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Philadelphia flights.
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From Lambert-St Louis to Philadelphia
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One-way flight from Lambert-St Louis to Philadelphia
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Highest demand for flights based on searches. 5% potential increase in price ($20 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Philadelphia.
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Price to beat on a one-way flight from Lambert-St Louis to Philadelphia.
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Find flight deals from St. Louis to Philadelphia

Cheapest flights from St. Louis to Philadelphia
Explore the most affordable flight options available from St. Louis to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 24, 2025.

This Flightnetwork deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/83:30 pmSTL - PHL
1 stop17h 30mFrontier
Mon 12/1510:00 pmPHL - STL
1 stop25h 33mFrontier
Deal found 10/24$150
This Booking.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1311:07 amSTL - PHL
1 stop6h 37mFrontier
Sat 11/156:19 amPHL - STL
1 stop27h 48mFrontier
Deal found 10/24$152
This Priceline deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/57:45 pmSTL - PHL
1 stop8h 04mFrontier
Thu 11/65:50 amPHL - STL
1 stop5h 22mFrontier
Deal found 10/23$163
This Booking.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/57:45 pmSTL - PHL
1 stop8h 04mFrontier
Sat 11/86:19 amPHL - STL
1 stop27h 48mFrontier
Deal found 10/24$165
This Mytrip deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/57:45 pmSTL - PHL
1 stop8h 04mFrontier
Wed 11/126:50 pmPHL - STL
1 stop19h 27mFrontier
Deal found 10/24$169
This Priceline deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/611:07 amSTL - PHL
1 stop6h 37mFrontier
Mon 11/105:05 amPHL - STL
1 stop9h 12mFrontier
Deal found 10/22$170
This Booking.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/43:30 pmSTL - PHL
1 stop8h 10mFrontier
Mon 12/810:00 pmPHL - STL
1 stop25h 33mFrontier
Deal found 10/24$172
This Frontier deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/77:45 pmSTL - PHL
1 stop8h 04mFrontier
Sun 11/95:50 amPHL - STL
1 stop5h 22mFrontier
Deal found 10/22$176
This Booking.com deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3011:07 amSTL - PHL
1 stop6h 37mFrontier
Thu 10/3010:32 pmPHL - STL
1 stop15h 45mFrontier
Deal found 10/23$178
This Frontier deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/611:07 amSTL - PHL
1 stop6h 37mFrontier
Sat 11/88:00 amPHL - STL
1 stop8h 38mFrontier
Deal found 10/23$179
This Frontier deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/611:07 amSTL - PHL
1 stop6h 37mFrontier
Sun 11/95:50 amPHL - STL
1 stop5h 22mFrontier
Deal found 10/22$183
This Kiwi.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1210:42 amSTL - PHL
2 stops23h 35mMultiple Airlines
Sun 12/148:36 pmPHL - STL
1 stop14h 38mMultiple Airlines
Deal found 10/24$186

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Philadelphia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 24, 2025.
Use the filters below to find and compare flights from St. Louis to Philadelphia that are best for you.

Fly from

St. Louis

Fly to

Philadelphia

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 11/12

7:45 pm-4:49 am

1 stop8h 04m

Philadelphia

Sun 11/16

10:32 pm-9:40 am

1 stop12h 08m

$163

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 11/13

7:45 pm-4:49 am

1 stop8h 04m

Philadelphia

Sun 11/16

10:32 pm-9:40 am

1 stop12h 08m

$163

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 11/6

11:07 am-6:44 pm

1 stop6h 37m

Philadelphia

Mon 11/10

5:05 am-1:17 pm

1 stop9h 12m

$170

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 2/28

5:00 pm-12:22 am

1 stop6h 22m

Philadelphia

Tue 3/3

1:30 pm-7:14 pm

1 stop6h 44m

$203

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 2/3

5:00 pm-10:56 pm

1 stop4h 56m

Philadelphia

Sun 2/8

6:00 am-9:44 am

1 stop4h 44m

$242

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sun 11/16

6:21 pm-9:30 am

1 stop14h 09m

Philadelphia

Wed 11/19

6:15 am-9:58 am

3 stops28h 43m

$251

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 12/13

6:00 am-9:19 am

Nonstop2h 19m

Philadelphia

Sun 12/14

7:35 am-2:50 pm

1 stop8h 15m

$260

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 1/14

6:00 am-9:22 am

Nonstop2h 22m

Philadelphia

Sat 1/17

7:17 am-6:13 pm

1 stop11h 56m

$295

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 12/6

3:30 pm-12:40 am

1 stop8h 10m

Philadelphia

Sat 12/13

4:00 pm-9:47 am

2 stops18h 47m

$297

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 12/22

7:02 pm-12:27 am

1 stop4h 25m

Philadelphia

Wed 12/24

5:49 pm-11:38 pm

1 stop6h 49m

$304

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/23

Showing 1-10 of 21 results
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Compare providers for flights from St. Louis to Philadelphia

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Philadelphia in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Philadelphia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Philadelphia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Philadelphia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Philadelphia flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Philadelphia flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Philadelphia

How far ahead should I book a flight from St. Louis to Philadelphia?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Philadelphia. Price data was last updated on October 17, 2025.

The price you pay for your flight from St. Louis to Philadelphia may vary depending on when you book. For the best chance of a lower fare, look to book 76 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from St. Louis to Philadelphia?

Currently, August is the cheapest month in which you can book a flight from St. Louis to Philadelphia (average of $129). Flying from St. Louis to Philadelphia in October is currently the most expensive (average of $203). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to PHL?

Find hourly flight availability from St. Louis to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 24, 2025.

It’s typically best to fly out from St. Louis to Philadelphia in the evening. Doing so could potentially save you 62% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from St. Louis to Philadelphia?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Philadelphia. Price data was last updated on October 19, 2025.

Travelers seeking maximum savings on their St. Louis to Philadelphia flight should consider departing on Wednesday evenings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for St. Louis to Philadelphia flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Philadelphia trip
Airports
STL

Expect security screening at STL to take 5-10 minutes during off-peak times. Check real-time wait times online before heading to the airport.

Read more about STLby Taryn White
PHL

For a quick trip to Center City, take the SEPTA Airport Line. It's efficient and operates between 5:00 a.m. and midnight.

Read more about PHLby Mark Chesnut
Our travel experts
Mark Chesnut

Mark Chesnut

Expert on PHL

Mark Chesnut

Mark Chesnut

Mark Chesnut is a travel writer and public speaker with more than 30 years of experience. The 2019 winner of the NLGJA Excellence in Travel Writing Award, Mark is the author of the book “Prepare for Departure” and has covered air travel for multiple top consumer and trade media outlets.

Read more
Taryn White

Taryn White

Expert on STL

Taryn White

Taryn White

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Philadelphia. Reviews last updated October 24, 2025.
Read reviews from past customers who have flown Southwest, American Airlines, and Spirit Airlines from St. Louis to Philadelphia. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,236 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,236 reviews
Southwest
8.0
Very good
4,236 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,033 reviews
Southwest
8.0
Very good
4,236 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Spirit Airlines
6.3
Okay
8,105 reviews
Southwest
8.0
Very good
4,236 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,128 reviews
Southwest
8.0
Very good
4,236 reviews

Comfort

8.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Philadelphia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from St. Louis to Philadelphia?

    Booking a flight from Lambert-St Louis (STL) to Philadelphia (PHL) is your only option if you wish to fly from St. Louis to Philadelphia. On a typical day, there are 5 flights from Lambert-St Louis to Philadelphia, all of which are around 2h 05m for a nonstop flight. You can also purchase a plane ticket from 4 airlines when you book a flight from Lambert-St Louis to Philadelphia.

  • How popular is this St. Louis to Philadelphia flight route?

    Within the past month, 17 users have taken a look at flights from Lambert-St Louis to Philadelphia.

  • How long is the flight from St. Louis to Philadelphia?

    There are many flights that can get you from St. Louis to Philadelphia in 4h 41m. Fly via Frontier or Delta to get the fastest option. Airlines will cover a distance of 811 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from St. Louis to Philadelphia round-trip?

    Cheapflights users have booked flights from St. Louis to Philadelphia round-trip from $106. Other airlines that can offer you cheap pricing are Frontier, from $137, and American Airlines, from $243. These flights start at 73% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from St. Louis to Philadelphia one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $68. Users have also found prices from $93 and $102 on Southwest and Delta, respectively.

  • What are the most reliable airlines from St. Louis to Philadelphia?

    No one likes to see their flight delayed. When booking a flight from St. Louis to Philadelphia consider choosing British Airways (91%), Qatar Airways (84%) or Southwest (73%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from St. Louis to Philadelphia?

    While on average a flight from St. Louis to Philadelphia is generally $675, our data shows the cheapest flight currently is $175. When looking at the most popular route, (Lambert-St Louis - Philadelphia), you can expect to pay $198 for that flight.

  • Can I find deals for flights from St. Louis to Philadelphia that include hotel bookings?

    Yes. In addition to deals on St. Louis to Philadelphia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Philadelphia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Philadelphia.

  • Can I find deals for business class flights from St. Louis to Philadelphia?

    Yes. Cheapflights offers flight deals from St. Louis to Philadelphia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Philadelphia?

    Currently, August is the cheapest month in which you can book a flight from St. Louis to Philadelphia (average of $129). Flying from St. Louis to Philadelphia in October is currently the most expensive (average of $203). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Wildwood
King of Prussia
Pottstown
Reading
Ocean City
Cherry Hill
Dewey Beach
Ephrata
Camden
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
Newark
Millville
Chester
Exton
Havre de Grace

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for St. Louis to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from St. Louis to Philadelphia

Discover the top 4 airlines that operate flights from St. Louis to Philadelphia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$106Average$219FlexibilityNo cancel feeOn-time65%
FrontierCheapest$137Average$232FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$243Average$417FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$297Average$421FlexibilityNo cancel feeOn-time63%

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