How many flights depart from St. Louis to Philadelphia on average per day?

As of June 2026, 7 flights take off from St. Louis and land in Philadelphia each day. The most common flight departure time for this route is 11:00AM, with 80% of daily flights taking off at noon.

What is the cheapest airline that flies from Lambert-St Louis to Philadelphia?

Frontier and Southwest are the most popular carriers operating from Lambert-St Louis to Philadelphia

How many flights depart from St. Louis to Philadelphia on average per week?

The number of flights available between St. Louis and Philadelphia is 55 per week as of June 2026. The most frequent departure day is Mon, with 16% of weekly flights leaving on this day.

What airlines fly to Philadelphia?

American Airlines, United Airlines and Delta are the top three most popular airlines that fly to Philadelphia from St. Louis according to our data. American Airlines is the first choice among our users, with 38% of people opting to fly with this airline when traveling to Philadelphia. Keep in mind that there are 5 different airlines that fly to Philadelphia on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Lambert-St Louis Airport to Philadelphia Airport?

Prices for flights from Lambert-St Louis Airport to Philadelphia Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Lambert-St Louis Airport to Philadelphia Airport?

The number of operators available for flights from Lambert-St Louis Airport to Philadelphia Airport is 3 as of June 2026.

How old do you have to be to fly from Lambert-St Louis Airport to Philadelphia Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Philadelphia Airport.

What documentation or ID do you need to fly to Philadelphia Airport?

The travel and health documents you'll need for your trip to Philadelphia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Philadelphia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$86 Cheap Flights from St. Louis to Philadelphia in 2026

Q: What is the typical price of a round-trip flight between St. Louis and Philadelphia?

Prices are currently low for flights on this route. Typical prices usually range from $441 to $533. The lowest price recently found on this route was $277.

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Philadelphia

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:08 pm - 5:39 am

STL

PHL

8h 31m

1 stop

5:52 pm - 11:59 pm

PHL

STL

7h 07m

1 stop

$277Frontier

Fri, Jul 10 - Sat, Aug 1

6:30 am - 11:35 am

STL

PHL

4h 05m

1 stop

1:45 pm - 8:00 pm

PHL

STL

7h 15m

2 stops

$278Southwest

Tue, Aug 11 - Tue, Aug 11

6:34 pm - 7:15 am

STL

PHL

11h 41m

1 stop

1:32 pm - 8:57 am

PHL

STL

20h 25m

1 stop

$279Frontier

Tue, Jul 7 - Sun, Jul 12

6:34 pm - 7:15 am

STL

PHL

11h 41m

1 stop

8:37 pm - 8:57 am

PHL

STL

13h 20m

2 stops

$280Frontier

Thu, Jul 16 - Thu, Jul 30

6:17 pm - 7:15 am

STL

PHL

11h 58m

1 stop

5:32 pm - 9:40 am

PHL

STL

17h 08m

2 stops

$281Frontier

Thu, Sep 3 - Tue, Sep 8

8:08 pm - 12:22 pm

STL

PHL

15h 14m

2 stops

4:40 pm - 8:57 am

PHL

STL

17h 17m

1 stop

$282Frontier

Mon, Jul 13 - Fri, Jul 24

4:57 pm - 7:15 am

STL

PHL

13h 18m

1 stop

1:32 pm - 11:59 pm

PHL

STL

11h 27m

2 stops

$283Frontier

Sat, Jul 11 - Sat, Aug 1

7:10 pm - 6:00 am

STL

PHL

9h 50m

1 stop

4:49 pm - 11:59 pm

PHL

STL

8h 10m

1 stop

$284Frontier

Mon, Jul 6 - Mon, Jul 13

10:15 am - 1:25 pm

STL

PHL

2h 10mnonstop

5:55 am - 10:10 am

PHL

STL

5h 15m

1 stop

$285Southwest

Sat, Aug 15 - Mon, Aug 17

4:57 pm - 7:15 am

STL

PHL

13h 18m

1 stop

1:32 pm - 11:59 pm

PHL

STL

11h 27m

2 stops

$286Frontier

Mon, Jul 13 - Sat, Jul 25

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Southwest flights from St. Louis to Philadelphia

Our best Southwest deals on St. Louis to Philadelphia flight tickets

Southwest

Aug 11

STL6:30 amLambert-St Louis

4h 05m

1 stop

PHL11:35 amPhiladelphia

Aug 11

PHL1:45 pmPhiladelphia

7h 15m

2 stops

STL8:00 pmLambert-St Louis

$278

Southwest

Aug 15

STL10:15 amLambert-St Louis

2h 10m

PHL1:25 pmPhiladelphia

Aug 17

PHL5:55 amPhiladelphia

5h 15m

1 stop

STL10:10 amLambert-St Louis

$285

Southwest

Aug 10

STL7:05 pmLambert-St Louis

2h 10m

PHL10:15 pmPhiladelphia

Aug 13

PHL6:20 amPhiladelphia

2h 15m

STL7:35 amLambert-St Louis

$297

Frontier flights from St. Louis to Philadelphia

Our best Frontier deals on St. Louis to Philadelphia flight tickets

Frontier

Jul 10

STL8:08 pmLambert-St Louis

8h 31m

1 stop

PHL5:39 amPhiladelphia

Aug 1

PHL5:52 pmPhiladelphia

7h 07m

1 stop

STL11:59 pmLambert-St Louis

$277

Frontier

Jul 7

STL6:34 pmLambert-St Louis

11h 41m

1 stop

PHL7:15 amPhiladelphia

Jul 12

PHL1:32 pmPhiladelphia

20h 25m

1 stop

STL8:57 amLambert-St Louis

$279

Frontier

Jul 16

STL6:34 pmLambert-St Louis

11h 41m

1 stop

PHL7:15 amPhiladelphia

Jul 30

PHL8:37 pmPhiladelphia

13h 20m

2 stops

STL8:57 amLambert-St Louis

$280

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 7/10

8:08 pm-5:39 am

1 stop8h 31m

Philadelphia

Sat 8/1

5:52 pm-11:59 pm

1 stop7h 07m

$277

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 8/11

6:30 am-11:35 am

1 stop4h 05m

Philadelphia

Tue 8/11

1:45 pm-8:00 pm

2 stops7h 15m

$278

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 7/7

6:34 pm-7:15 am

1 stop11h 41m

Philadelphia

Sun 7/12

1:32 pm-8:57 am

1 stop20h 25m

$279

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 7/16

6:34 pm-7:15 am

1 stop11h 41m

Philadelphia

Thu 7/30

8:37 pm-8:57 am

2 stops13h 20m

$280

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 9/3

6:17 pm-7:15 am

1 stop11h 58m

Philadelphia

Tue 9/8

5:32 pm-9:40 am

2 stops17h 08m

$281

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 7/13

8:08 pm-12:22 pm

2 stops15h 14m

Philadelphia

Fri 7/24

4:40 pm-8:57 am

1 stop17h 17m

$282

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 7/11

4:57 pm-7:15 am

1 stop13h 18m

Philadelphia

Sat 8/1

1:32 pm-11:59 pm

2 stops11h 27m

$283

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 7/6

7:10 pm-6:00 am

1 stop9h 50m

Philadelphia

Mon 7/13

4:49 pm-11:59 pm

1 stop8h 10m

$284

Quickest round-trip

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 8/15

10:15 am-1:25 pm

Nonstop2h 10m

Philadelphia

Mon 8/17

5:55 am-10:10 am

1 stop5h 15m

$285

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 7/13

4:57 pm-7:15 am

1 stop13h 18m

Philadelphia

Sat 7/25

1:32 pm-11:59 pm

2 stops11h 27m

$286

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Philadelphia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the typical price of a round-trip flight between St. Louis and Philadelphia?

What is the cheapest month to fly to Philadelphia?

The cheapest month to fly to Philadelphia from St. Louis is in August. Flight prices, which tend to average around $287, are often lower during this time because this is during the off-season. The month of September is another great option to travel to Philadelphia, with average flight prices from St. Louis averaging around $329.

What is the cheapest day to depart on your flight to Philadelphia?

The cheapest day to depart from St. Louis to Philadelphia is on a Friday. Travelers who choose to depart for Philadelphia on a Friday will often find tickets for as low as $530. On the other hand, Saturday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $869.

What is the cheapest time of day to depart on your flight to Philadelphia?

According to our data, the cheapest time of day to fly to Philadelphia is in the evening. momondo users have found flights departing from St. Louis to Philadelphia in the evening for as low as $444. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Philadelphia is at noon when prices are around $971.

What is the cheapest Lambert-St Louis to Philadelphia flight route?

Fly from Lambert-St Louis to Philadelphia for the best Lambert-St Louis - Philadelphia flight prices

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

You are more likely to see cheaper flights to Philadelphia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Philadelphia for around $418 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Philadelphia from St. Louis for as low as $337 on momondo.

What cabin class options are available on St. Louis to Philadelphia flights?

There are 4 cabin classes available to choose from on St. Louis to Philadelphia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on St. Louis to Philadelphia flights?

You could potentially save up to 1% on your flight if you consider stops on a St. Louis to Philadelphia flight.

How have St. Louis to Philadelphia flight prices changed over time?

As of June 2026, prices for St. Louis to Philadelphia flights are approximately 75% more expensive when compared to flights at the same time last year.

When to book flights from St. Louis to Philadelphia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Philadelphia according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to Philadelphia (STL to PHL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Philadelphia

Best Price Found	$233
Fastest flight time	2h 10m
Direct flights	Every day
Airports in Philadelphia	1 airport

The best one-way flight to Philadelphia from St. Louis in the past 72 hours is $233. The best round-trip flight deal from St. Louis to Philadelphia found on momondo in the last 72 hours is $405.

The fastest flight from St. Louis to Philadelphia takes 2h 10m

Direct flights go from St. Louis to Philadelphia every day.

There is 1 airport in Philadelphia. From St. Louis there are direct flights to Philadelphia (PHL).

Search flight deals

Frequently asked questions about flying from St. Louis to Philadelphia

How far is Lambert-St Louis to Philadelphia by plane?
The distance between Lambert-St Louis and Philadelphia is about 808.1 mi. Flights usually cover this in 2h 10m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Lambert-St Louis Airport to Philadelphia Airport?
Prices for flights from Lambert-St Louis Airport to Philadelphia Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Philadelphia Airport?
The number of operators available for flights from Lambert-St Louis Airport to Philadelphia Airport is 3 as of June 2026.
How old do you have to be to fly from Lambert-St Louis Airport to Philadelphia Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Philadelphia Airport.
What documentation or ID do you need to fly to Philadelphia Airport?
The travel and health documents you'll need for your trip to Philadelphia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Philadelphia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to Philadelphia?
Based on momondo bookings for flights between St. Louis and Philadelphia, the leading plane model is Airbus A319, making up 38.60% of the total bookings. Other popular models include Boeing 737 MAX 8 with 20.47%, Boeing 737-800 Passenger/BBJ2 (winglets) with 10.00%, and Canadair (Bombardier) Regional Jet 900 with 8.60%.
What is the most popular airline from St. Louis to Philadelphia?
momondo data reveals that the most frequently booked airline on the route from St. Louis to Philadelphia is American Airlines, representing 58% of all bookings. The subsequent popular airlines are Southwest at 30% and Frontier at 12%.

Best airlines flying from St. Louis to Philadelphia

Compare and see reviews for airlines that fly from St. Louis to Philadelphia with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $142	Free Cancellation	Rating 5.6 2,864 reviews	Search Frontier flights
American Airlines	PriceFrom $239	Free Cancellation	Rating 7.1 11,772 reviews	Search American Airlines flights
Southwest	PriceFrom $275	Free Cancellation	Rating 7.9 4,245 reviews	Search Southwest flights

Southwest Flights From St. Louis to Philadelphia
Southwest flight deals from St. Louis to Philadelphia start from $275 round-trip. Over the 10 Southwest flights for this route in a normal week, average airfare is usually $465 round-trip - but some users have found much cheaper deals with momondo.
American Airlines Flights From St. Louis to Philadelphia
American Airlines (7.1/10 from 11,772 reviews) operates around 20 flights from St. Louis to Philadelphia in any given week. The average American Airlines airfare for this route is around $441, with deals from around $239 rare but found on momondo. Referenced prices are for round-trip St. Louis to Philadelphia flight searches in the last 72 hours.

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Ocean City

Cherry Hill

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Newark

Reading

Dewey Beach

Dover

North Wildwood

Essington

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New Castle

Lewes

Stone Harbor

Vineland

Chester

Pottstown

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Philadelphia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Philadelphia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Philadelphia with flexible booking policies on momondo?

momondo does allow users to show only those flights to Philadelphia from St. Louis which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from St. Louis to Philadelphia?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Philadelphia.

I’m not ready to book a flight from St. Louis to Philadelphia right now. Can momondo alert me if prices change?

If you are not ready to book a flight from St. Louis to Philadelphia now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Philadelphia and let you know when they change.