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

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

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

4 flights are operational daily from St. Louis to Philadelphia as of September 2026. The most popular departure time for this route is 11:00, with 69% of flights per day taking off at midday.

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

The number of flights available between St. Louis and Philadelphia is 28 per week as of September 2026. The most frequent departure day is Wed, with 36% of weekly flights leaving on this day.

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 updated daily.

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 stopovers 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 necessary travel and health documents for your Philadelphia Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

R2 265 Cheap Flights from St. Louis to Philadelphia in 2026/27

Find the cheapest flights from St. Louis to Philadelphia

Return

One-way

Last minute

Direct

Cheap return flights

Enter your travel dates to find the best prices.

19:50 - 23:15STL Lambert-St Louis-PHL Philadelphia

2h 25mdirect

6:25 - 7:45PHL Philadelphia-STL Lambert-St Louis

2h 20mdirect

R4 513Southwest

Thu, Oct 22 - Mon, Oct 26

19:50 - 23:15STL Lambert-St Louis-PHL Philadelphia

2h 25mdirect

15:20 - 19:00PHL Philadelphia-STL Lambert-St Louis

4h 40m1 stop Chicago Midway

R4 676Southwest

Thu, Oct 22 - Mon, Oct 26

10:35 - 13:45STL Lambert-St Louis-PHL Philadelphia

2h 10mdirect

13:50 - 21:20PHL Philadelphia-STL Lambert-St Louis

8h 30m2 stops Chicago Midway Nashville Intl

R4 758Southwest

Sat, Nov 7 - Mon, Nov 9

7:03 - 14:33STL Lambert-St Louis-PHL Philadelphia

6h 30m1 stop Atlanta Hartsfield-Jackson

19:34 - 0:05PHL Philadelphia-STL Lambert-St Louis

5h 31m1 stop Atlanta Hartsfield-Jackson

R4 839Delta

Thu, Dec 10 - Thu, Dec 10

19:50 - 23:15STL Lambert-St Louis-PHL Philadelphia

2h 25mdirect

6:25 - 7:45PHL Philadelphia-STL Lambert-St Louis

2h 20mdirect

R4 855Southwest

Fri, Oct 23 - Mon, Oct 26

10:45 - 18:40STL Lambert-St Louis-PHL Philadelphia

6h 55m2 stops Atlanta Hartsfield-Jackson Chicago Midway

17:20 - 0:10PHL Philadelphia-STL Lambert-St Louis

7h 50m1 stop Orlando

R4 921Southwest

Sat, Nov 7 - Mon, Nov 9

10:45 - 18:40STL Lambert-St Louis-PHL Philadelphia

6h 55m2 stops Atlanta Hartsfield-Jackson Chicago Midway

13:55 - 22:00PHL Philadelphia-STL Lambert-St Louis

9h 05m2 stops Orlando Nashville Intl

R5 002Southwest

Sat, Nov 7 - Tue, Nov 10

16:50 - 1:10STL Lambert-St Louis-PHL Philadelphia

7h 20m1 stop Denver Intl

19:40 - 21:00PHL Philadelphia-STL Lambert-St Louis

2h 20mdirect

R5 018Southwest

Fri, Oct 23 - Mon, Oct 26

20:00 - 23:05STL Lambert-St Louis-PHL Philadelphia

2h 05mdirect

7:30 - 13:40PHL Philadelphia-STL Lambert-St Louis

7h 10m2 stops Chicago Midway Nashville Intl

R5 100Southwest

Mon, Dec 21 - Fri, Dec 25

10:35 - 16:44STL Lambert-St Louis-PHL Philadelphia

5h 09m1 stop Detroit Metropolitan Wayne County

14:26 - 18:15PHL Philadelphia-STL Lambert-St Louis

4h 49m1 stop Atlanta Hartsfield-Jackson

R5 181Delta

Sat, Oct 24 - Fri, Oct 30

Cheap last-minute flights

Enter your travel dates to find the best prices.

18:40 - 21:55STL Lambert-St Louis-PHL Philadelphia

2h 15mdirect

7:45 - 15:00PHL Philadelphia-STL Lambert-St Louis

8h 15m2 stops Chicago Midway Atlanta Hartsfield-Jackson

R10 134Southwest

Tue, Sep 29 - Tue, Oct 6

6:40 - 11:44STL Lambert-St Louis-PHL Philadelphia

4h 04m1 stop Detroit Metropolitan Wayne County

6:10 - 9:49PHL Philadelphia-STL Lambert-St Louis

4h 39m1 stop Detroit Metropolitan Wayne County

R10 216Delta

Tue, Sep 29 - Sat, Oct 10

14:50 - 23:55STL Lambert-St Louis-PHL Philadelphia

8h 05m2 stops Kansas City Denver Intl

11:25 - 19:00PHL Philadelphia-STL Lambert-St Louis

8h 35m2 stops Chicago Midway Nashville Intl

R10 379Southwest

Tue, Sep 29 - Tue, Oct 6

10:15 - 13:25STL Lambert-St Louis-PHL Philadelphia

2h 10mdirect

18:35 - 20:00PHL Philadelphia-STL Lambert-St Louis

2h 25mdirect

R10 460Southwest

Sat, Sep 26 - Mon, Sep 28

14:15 - 22:55STL Lambert-St Louis-PHL Philadelphia

7h 40m1 stop Denver Intl

18:35 - 20:00PHL Philadelphia-STL Lambert-St Louis

2h 25mdirect

R10 623Southwest

Sat, Sep 26 - Mon, Sep 28

8:30 - 18:25STL Lambert-St Louis-PHL Philadelphia

8h 55m2 stops Atlanta Hartsfield-Jackson Chicago Midway

18:35 - 20:00PHL Philadelphia-STL Lambert-St Louis

2h 25mdirect

R10 705Southwest

Sat, Sep 26 - Mon, Sep 28

15:11 - 21:29STL Lambert-St Louis-PHL Philadelphia

5h 18m1 stop Chicago O'Hare Intl

15:08 - 19:21PHL Philadelphia-STL Lambert-St Louis

5h 13m1 stop Washington, D.C. Dulles Intl

R10 786United Airlines

Mon, Sep 28 - Tue, Sep 29

9:00 - 18:25STL Lambert-St Louis-PHL Philadelphia

8h 25m2 stops Dallas Love Field Chicago Midway

14:05 - 19:05PHL Philadelphia-STL Lambert-St Louis

6h 00m1 stop Chicago Midway

R10 868Southwest

Sat, Sep 26 - Mon, Sep 28

11:05 - 22:05STL Lambert-St Louis-PHL Philadelphia

10h 00m2 stops Chicago Midway Nashville Intl

11:00 - 19:30PHL Philadelphia-STL Lambert-St Louis

9h 30m2 stops Chicago Midway Dallas Love Field

R10 965Southwest

Fri, Sep 25 - Sat, Sep 26

12:40 - 15:55STL Lambert-St Louis-PHL Philadelphia

2h 15mdirect

6:25 - 7:45PHL Philadelphia-STL Lambert-St Louis

2h 20mdirect

R11 030Southwest

Sun, Sep 27 - Fri, Oct 2

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Southwest flights from St. Louis to Philadelphia

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

Southwest

Oct 22

STL19:50Lambert-St Louis

2h 25m

PHL23:15Philadelphia

Oct 26

PHL6:25Philadelphia

2h 20m

STL7:45Lambert-St Louis

R4 513

Southwest

Oct 22

STL19:50Lambert-St Louis

2h 25m

PHL23:15Philadelphia

Oct 26

PHL15:20Philadelphia

4h 40m

1 stop

STL19:00Lambert-St Louis

R4 676

Southwest

Nov 7

STL10:35Lambert-St Louis

2h 10m

PHL13:45Philadelphia

Nov 9

PHL13:50Philadelphia

8h 30m

2 stops

STL21:20Lambert-St Louis

R4 758

United Airlines flights from St. Louis to Philadelphia

Our best United Airlines deals on St. Louis to Philadelphia flight tickets

United Airlines

Feb 3

STL5:25Lambert-St Louis

5h 49m

1 stop

PHL12:14Philadelphia

Feb 7

PHL6:00Philadelphia

4h 48m

1 stop

STL9:48Lambert-St Louis

R6 811

United Airlines

Dec 26

STL18:58Lambert-St Louis

4h 36m

1 stop

PHL0:34Philadelphia

Jan 1

PHL6:24Philadelphia

5h 18m

1 stop

STL10:42Lambert-St Louis

R6 827

United Airlines

Oct 13

STL13:29Lambert-St Louis

4h 55m

1 stop

PHL19:24Philadelphia

Oct 19

PHL9:34Philadelphia

7h 09m

1 stop

STL15:43Lambert-St Louis

R7 120

momondo 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

Cheapest return flight

Fastest return journey

St. LouisPhiladelphia

STL Lambert-St Louis - PHL Philadelphia

STLPHL

Lambert-St Louis

Thu 22/10

19:50-23:15

Nonstop2h 25m

Philadelphia

Mon 26/10

6:25-7:45

Nonstop2h 20m

R4 513

St. LouisPhiladelphia

STL Lambert-St Louis - PHL Philadelphia

STLPHL

Lambert-St Louis

Thu 22/10

19:50-23:15

Nonstop2h 25m

Philadelphia

Mon 26/10

15:20-19:00

1 stop4h 40m

R4 676

St. LouisPhiladelphia

STL Lambert-St Louis - PHL Philadelphia

STLPHL

Lambert-St Louis

Sat 7/11

10:35-13:45

Nonstop2h 10m

Philadelphia

Mon 9/11

13:50-21:20

2 stops8h 30m

R4 758

St. LouisPhiladelphia

STL Lambert-St Louis - PHL Philadelphia

STLPHL

Lambert-St Louis

Thu 10/12

7:03-14:33

1 stop6h 30m

Philadelphia

Thu 10/12

19:34-0:05

1 stop5h 31m

R4 839

St. LouisPhiladelphia

STL Lambert-St Louis - PHL Philadelphia

STLPHL

Lambert-St Louis

Fri 23/10

19:50-23:15

Nonstop2h 25m

Philadelphia

Mon 26/10

6:25-7:45

Nonstop2h 20m

R4 855

St. LouisPhiladelphia

STL Lambert-St Louis - PHL Philadelphia

STLPHL

Lambert-St Louis

Sat 7/11

10:45-18:40

2 stops6h 55m

Philadelphia

Mon 9/11

17:20-0:10

1 stop7h 50m

R4 921

St. LouisPhiladelphia

STL Lambert-St Louis - PHL Philadelphia

STLPHL

Lambert-St Louis

Sat 7/11

10:45-18:40

2 stops6h 55m

Philadelphia

Tue 10/11

13:55-22:00

2 stops9h 05m

R5 002

St. LouisPhiladelphia

STL Lambert-St Louis - PHL Philadelphia

STLPHL

Lambert-St Louis

Fri 23/10

16:50-1:10

1 stop7h 20m

Philadelphia

Mon 26/10

19:40-21:00

Nonstop2h 20m

R5 018

St. LouisPhiladelphia

STL Lambert-St Louis - PHL Philadelphia

STLPHL

Lambert-St Louis

Mon 21/12

20:00-23:05

Nonstop2h 05m

Philadelphia

Fri 25/12

7:30-13:40

2 stops7h 10m

R5 100

St. LouisPhiladelphia

STL Lambert-St Louis - PHL Philadelphia

STLPHL

Lambert-St Louis

Sat 24/10

10:35-16:44

1 stop5h 09m

Philadelphia

Fri 30/10

14:26-18:15

1 stop4h 49m

R5 181

Flights are sorted by cheapest return 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?

Prices are currently low for flights on this route.

Typical prices usually range from R4 986 to R8 171.
The lowest price recently found on this route was R4 513.

What is the cheapest month to fly to Philadelphia?

In general, September is the cheapest month to fly from St. Louis to Philadelphia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around R6 077. If you are unable to visit Philadelphia during the month of September, then departing from St. Louis during the month January is also very affordable. Most momondo users find prices during this month for around R6 257.

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 R7 132 when searching weeks before you fly. 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 R5 931 on momondo.

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

As of September 2026, prices for St. Louis to Philadelphia flights are approximately 65% 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 return 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	R2 265
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 R2 265. The best return flight deal from St. Louis to Philadelphia found on momondo in the last 72 hours is R4 513.

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 1300,6 km.
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 updated daily.
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 stopovers 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 necessary travel and health documents for your Philadelphia Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to Philadelphia?
momondo data reveals that the most frequently booked plane model on the route from St. Louis to Philadelphia is Airbus A319, representing 28,09% of all bookings. The subsequent popular models are Canadair (Bombardier) Regional Jet 900 at 18,40%, Boeing 737 MAX 8 at 17,19%, and Boeing 737-800 Passenger/BBJ2 (winglets) at 10,90%.

Cape May

Why use momondo?

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

Finding the right flight to Philadelphia from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Philadelphia quick and easy, saving you time and money.

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?

Once all potential St. Louis to Philadelphia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Of course. momondo tracks the price of St. Louis to Philadelphia flights. All you need is a valid email address and we will do the rest; it is that quick and easy.