Which airport typically offers the quickest layover for flights from St. Louis to Philadelphia?

Flights via Orlando (MCO) offer the fastest connection on this route, with an average layover time of 2h 19m.

What’s the fastest layover option from St. Louis to Philadelphia?

Flights via Orlando (MCO) have the shortest average one-way travel time for 1-stop routes: 6h 14m.

What’s the cheapest layover airport for flights from St. Louis to Philadelphia?

Detroit (DTW) is the most affordable 1-stop option, with an average round-trip price of $196.

What’s the top layover airport for flights from St. Louis to Philadelphia?

Detroit (DTW) – chosen by Cheapflights users on 71% of 1-stop itineraries from St. Louis to Philadelphia on Cheapflights.

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 16h 14m. Fly via Frontier to get the fastest option. Airlines will cover a distance of 811 mi.

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 $130, and American Airlines, from $243. These flights start at 73% lower than the current average price 3 months from now.

In terms of precipitation, rainfall in Philadelphia ranges from 2.7 - 4.4 inches per month. July is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Philadelphia when rainfall is around 2.7 in.

If weather is an important factor for your trip to Philadelphia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

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

While on average a flight from St. Louis to Philadelphia is generally $739, our data shows the cheapest flight currently is $153. When looking at the most popular route, (Lambert-St Louis - Philadelphia), you can expect to pay $133 for that flight.

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 (94%), Qatar Airways (87%) or American Airlines (84%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from St. Louis to Philadelphia?

The most popular airlines flying from St. Louis to Philadelphia are American Airlines, Southwest and Frontier. Something to consider prior to booking your flight.

Most accurate provider : When it comes to deals on St. Louis-Philadelphia flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Philadelphia flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

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 7 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.

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.

$65+ Flights from St. Louis to Philadelphia

Q: How much does it cost to fly round-trip from St. Louis to Philadelphia?

Airfare is below average for this route at the moment. St. Louis to Philadelphia flights typically cost between $384 and $524 in December. The cheapest round-trip price found within the last 3 days was $133 on Multiple Airlines (Dec 11-Dec 15).

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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”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$133 (Priceline)
One-way from	$65 (Trip.com)
Popular in	November
Cheapest in	August
Average price	$486
Good round-trip deal	$486 or less
Good one-way deal	$233 or less

Provider with most accurate pricing for Lambert-St Louis-Philadelphia flight deals.

Search Deals

Provider most trusted by Cheapflights users for Lambert-St Louis-Philadelphia flights.

Search Deals

From Lambert-St Louis to Philadelphia

Search Deals

One-way flight from Lambert-St Louis to Philadelphia

Search Deals

Highest demand for flights based on searches. 7% potential increase in price ($34 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in November 2025

Search Deals

Price to beat on a round-trip flight from Lambert-St Louis to Philadelphia.

Search Deals

Price to beat on a one-way flight from Lambert-St Louis to Philadelphia.

Search Deals

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 November 25, 2025.

Thu 12/112:47 pmSTL - PHL

1 stop7h 29mMultiple Airlines

Mon 12/154:21 pmPHL - STL

1 stop7h 12mMultiple Airlines

Deal found 11/24

$133

Thu 12/112:47 pmSTL - PHL

1 stop7h 29mMultiple Airlines

Sat 12/132:06 pmPHL - STL

1 stop9h 27mMultiple Airlines

Deal found 11/25

$141

Wed 12/33:30 pmSTL - PHL

1 stop28h 09mFrontier

Wed 12/104:00 pmPHL - STL

1 stop7h 33mFrontier

Deal found 11/25

$162

Tue 12/304:27 pmSTL - PHL

1 stop7h 21mFrontier

Sun 1/45:10 amPHL - STL

1 stop5h 30mFrontier

Deal found 11/23

$163

Wed 12/103:30 pmSTL - PHL

1 stop17h 30mFrontier

Thu 12/112:06 pmPHL - STL

1 stop19h 53mFrontier

Deal found 11/24

$164

Wed 12/173:30 pmSTL - PHL

1 stop22h 16mFrontier

Tue 12/305:10 amPHL - STL

1 stop5h 30mFrontier

Deal found 11/23

$168

Mon 12/157:43 pmSTL - PHL

1 stop8h 48mFrontier

Tue 12/1610:00 pmPHL - STL

1 stop25h 33mFrontier

Deal found 11/24

$169

Thu 12/112:47 pmSTL - PHL

1 stop7h 29mMultiple Airlines

Sun 1/116:01 pmPHL - STL

1 stop29h 32mMultiple Airlines

Deal found 11/24

$173

Tue 12/2310:10 pmSTL - PHL

1 stop30h 30mFrontier

Tue 12/3010:00 amPHL - STL

1 stop13h 33mFrontier

Deal found 11/24

$175

Thu 12/43:30 pmSTL - PHL

1 stop8h 10mFrontier

Mon 12/82:06 pmPHL - STL

1 stop9h 27mFrontier

Deal found 11/24

$183

Sat 12/133:30 pmSTL - PHL

1 stop8h 10mFrontier

Sun 1/45:10 amPHL - STL

1 stop5h 30mFrontier

Deal found 11/23

$184

Best flights from St. Louis to Philadelphia
Discover carefully curated flight deals from St. Louis to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 25, 2025.

Thu 12/112:47 pmSTL - PHL

1 stop7h 29mMultiple Airlines

Sat 12/132:06 pmPHL - STL

1 stop9h 27mMultiple Airlines

Deal found 11/25

$141

Thu 1/224:45 pmSTL - PHL

1 stop16h 14mFrontier

Mon 1/268:35 pmPHL - STL

1 stop27h 58mFrontier

Deal found 11/25

$226

Thu 12/258:15 amSTL - PHL

Nonstop2h 10mSouthwest

Thu 1/18:05 amPHL - STL

Nonstop2h 30mSouthwest

Deal found 11/25

$351

Tue 1/66:00 amSTL - PHL

Nonstop2h 22mAmerican Airlines

Thu 1/88:47 pmPHL - STL

Nonstop2h 57mAmerican Airlines

Deal found 11/25

$368

Sun 1/115:11 pmSTL - PHL

2 stops20h 44mMultiple Airlines

Thu 1/155:30 amPHL - STL

1 stop18h 04mMultiple Airlines

Deal found 11/25

$204

Mon 1/128:50 amSTL - PHL

2 stops14h 41mMultiple Airlines

Thu 1/158:43 pmPHL - STL

1 stop12h 11mMultiple Airlines

Deal found 11/25

$204

Thu 12/255:19 pmSTL - PHL

1 stop11h 21mFrontier

Thu 1/13:46 pmPHL - STL

1 stop7h 47mFrontier

Deal found 11/25

$277

Mon 12/87:43 pmSTL - PHL

2 stops27h 57mFrontier

Thu 12/1110:00 pmPHL - STL

1 stop11h 59mFrontier

Deal found 11/25

$289

Thu 1/159:50 amSTL - PHL

2 stops7h 12mMultiple Airlines

Mon 1/196:33 pmPHL - STL

1 stop30h 00mMultiple Airlines

Deal found 11/23

$265

Mon 12/158:15 amSTL - PHL

Nonstop2h 10mSouthwest

Tue 12/168:05 amPHL - STL

Nonstop2h 30mSouthwest

Deal found 11/24

$368

Thu 12/2510:42 amSTL - PHL

2 stops21h 25mMultiple Airlines

Thu 1/13:46 pmPHL - STL

1 stop7h 47mMultiple Airlines

Deal found 11/25

$302

Last-minute flights from St. Louis to Philadelphia
Discover last-minute flight deals from St. Louis to Philadelphia. Data last updated November 25, 2025 and is based on user searches.

Wed 12/33:30 pmSTL - PHL

1 stop28h 09mFrontier

Wed 12/104:00 pmPHL - STL

1 stop7h 33mFrontier

Deal found 11/25

$162

Thu 12/43:30 pmSTL - PHL

1 stop8h 10mFrontier

Mon 12/82:06 pmPHL - STL

1 stop9h 27mFrontier

Deal found 11/24

$183

Wed 12/103:30 pmSTL - PHL

1 stop17h 30mFrontier

Thu 12/112:06 pmPHL - STL

1 stop19h 53mFrontier

Deal found 11/24

$164

Thu 12/112:47 pmSTL - PHL

1 stop7h 29mMultiple Airlines

Mon 12/154:21 pmPHL - STL

1 stop7h 12mMultiple Airlines

Deal found 11/24

$133

Thu 12/112:47 pmSTL - PHL

1 stop7h 29mMultiple Airlines

Sat 12/132:06 pmPHL - STL

1 stop9h 27mMultiple Airlines

Deal found 11/25

$141

Thu 12/112:47 pmSTL - PHL

1 stop7h 29mMultiple Airlines

Sun 1/116:01 pmPHL - STL

1 stop29h 32mMultiple Airlines

Deal found 11/24

$173

Sat 12/133:30 pmSTL - PHL

1 stop8h 10mFrontier

Sun 1/45:10 amPHL - STL

1 stop5h 30mFrontier

Deal found 11/23

$184

Mon 12/157:43 pmSTL - PHL

1 stop8h 48mFrontier

Tue 12/1610:00 pmPHL - STL

1 stop25h 33mFrontier

Deal found 11/24

$169

Wed 12/173:30 pmSTL - PHL

1 stop22h 16mFrontier

Tue 12/305:10 amPHL - STL

1 stop5h 30mFrontier

Deal found 11/23

$168

Tue 12/2310:10 pmSTL - PHL

1 stop30h 30mFrontier

Tue 12/3010:00 amPHL - STL

1 stop13h 33mFrontier

Deal found 11/24

$175

Tue 12/304:27 pmSTL - PHL

1 stop7h 21mFrontier

Sun 1/45:10 amPHL - STL

1 stop5h 30mFrontier

Deal found 11/23

$163

One-way flights from St. Louis to Philadelphia
Search for one-way flight options from St. Louis to Philadelphia. Find affordable one-way fares based on user searches. Data last updated November 25, 2025.

Sat 1/2412:12 pmSTL - PHL

1 stop9h 20mFrontier

Deal found 11/25

$65

Wed 1/214:45 pmSTL - PHL

1 stop19h 51mFrontier

Deal found 11/25

$68

Mon 1/265:42 pmSTL - PHL

1 stop26h 38mMultiple Airlines

Deal found 11/25

$76

Mon 12/83:30 pmSTL - PHL

1 stop8h 10mFrontier

Deal found 11/24

$78

Mon 2/235:11 pmSTL - PHL

1 stop6h 29mFrontier

Deal found 11/24

$81

Wed 12/33:30 pmSTL - PHL

1 stop20h 06mFrontier

Deal found 11/24

$87

Wed 12/173:30 pmSTL - PHL

1 stop22h 16mFrontier

Deal found 11/25

$88

Tue 12/2311:51 amSTL - PHL

1 stop23h 34mMultiple Airlines

Deal found 11/24

$90

Fri 1/234:45 pmSTL - PHL

1 stop16h 52mFrontier

Deal found 11/25

$96

Sun 1/254:45 pmSTL - PHL

2 stops24h 52mFrontier

Deal found 11/24

$100

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Philadelphia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 12/11

2:47 pm-11:16 pm

1 stop7h 29m

Philadelphia

Sat 12/13

2:06 pm-10:33 pm

1 stop9h 27m

$141

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sun 1/11

5:11 pm-2:55 pm

2 stops20h 44m

Philadelphia

Thu 1/15

5:30 am-10:34 pm

1 stop18h 04m

$204

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 1/12

8:50 am-12:31 am

2 stops14h 41m

Philadelphia

Thu 1/15

8:43 pm-7:54 am

1 stop12h 11m

$204

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 1/22

4:45 pm-9:59 am

1 stop16h 14m

Philadelphia

Mon 1/26

8:35 pm-11:33 pm

1 stop27h 58m

$226

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 1/15

9:50 am-6:02 pm

2 stops7h 12m

Philadelphia

Mon 1/19

6:33 pm-11:33 pm

1 stop30h 00m

$265

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 12/25

5:19 pm-5:40 am

1 stop11h 21m

Philadelphia

Thu 1/1

3:46 pm-10:33 pm

1 stop7h 47m

$277

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 12/8

7:43 pm-12:40 am

2 stops27h 57m

Philadelphia

Thu 12/11

10:00 pm-8:59 am

1 stop11h 59m

$289

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 12/25

10:42 am-9:07 am

2 stops21h 25m

Philadelphia

Thu 1/1

3:46 pm-10:33 pm

1 stop7h 47m

$302

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 12/25

8:15 am-11:25 am

Nonstop2h 10m

Philadelphia

Thu 1/1

8:05 am-9:35 am

Nonstop2h 30m

$351

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 1/6

6:00 am-9:22 am

Nonstop2h 22m

Philadelphia

Thu 1/8

8:47 pm-10:44 pm

Nonstop2h 57m

$368

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/24

Showing 1-10 of 21 results

Compare providers for flights from St. Louis to Philadelphia

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 November.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
JustAirTicket	Price Accuracy-	Trust Score*1 star

*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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Philadelphia flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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

Prices

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

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 May is currently the most expensive (average of $199). 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?

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?

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.

How much does it cost to fly round-trip from St. Louis to Philadelphia?

The best insider tips for St. Louis to Philadelphia flights

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.

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.

Our travel experts

Mark Chesnut

Expert on PHL

Taryn White

Expert on STL

Reviews of airlines servicing Philadelphia

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

4,252 reviews

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

4,252 reviews

Southwest

8.0

Very good

4,252 reviews

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

11,042 reviews

Southwest

8.0

Very good

4,252 reviews

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

8,157 reviews

Southwest

8.0

Very good

4,252 reviews

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

3,097 reviews

Southwest

8.0

Very good

4,252 reviews

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

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 7 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 16h 14m. Fly via Frontier to get the fastest option. Airlines will cover a distance of 811 mi.
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 $130, and American Airlines, from $243. These flights start at 73% lower than the current average price 3 months from now.
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 (94%), Qatar Airways (87%) or American Airlines (84%) 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 $739, our data shows the cheapest flight currently is $153. When looking at the most popular route, (Lambert-St Louis - Philadelphia), you can expect to pay $133 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 May is currently the most expensive (average of $199). 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.

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Top 4 airlines flying from St. Louis to Philadelphia

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$106	Average$219	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$130	Average$229	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$243	Average$418	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$297	Average$422	FlexibilityNo cancel fee	On-time63%

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$65+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Philadelphia with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from St. Louis to Philadelphia

Cheapest flights from St. Louis to PhiladelphiaExplore 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 November 25, 2025.

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 November 25, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Philadelphia that are best for you.

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 November.

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.

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

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

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

How much does it cost to fly round-trip from St. Louis to Philadelphia?

What’s the top layover airport for flights from St. Louis to Philadelphia?

What’s the cheapest layover airport for flights from St. Louis to Philadelphia?

What’s the fastest layover option from St. Louis to Philadelphia?

Which airport typically offers the quickest layover for flights from St. Louis to Philadelphia?

The best insider tips for St. Louis to Philadelphia flights

Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Philadelphia trip

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Reviews of airlines servicing Philadelphia

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.

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?

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

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

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

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

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

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

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

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

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Alternative routes for St. Louis to Philadelphia

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Top 4 airlines flying from St. Louis to Philadelphia

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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 November 25, 2025.