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Cheap flights from St. Louis to Philadelphia from $54

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Philadelphia departing on 12/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from St. Louis to Philadelphia

Cheap round-trip flights

These are some of the best round-trip flight deals from St. Louis to Philadelphia that have been recently found on momondo from popular airlines, departing in the coming months.

Cheap one-way flights

Flying one-way? These are some of the best deals recently discovered on momondo for flights from St. Louis to Philadelphia.

Cheap last minute flights

Planning a quick getaway from St. Louis to Philadelphia? These are the last-minute flight deals available now.

Cheap direct flights

If you prefer a non-stop journey, check out our latest direct flight deals to Philadelphia, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from St. Louis to Philadelphia

Find recent round-trip train or bus tickets from St. Louis to Philadelphia.

All round-trip flight deals to Philadelphia

The cheapest plane tickets to Philadelphia found on KAYAK recently.
5:02 pm - 8:45 amSTL-PHL
14h 43m1 stop
5:20 am - 11:33 pmPHL-STL
19h 13m1 stop
$118Frontier
Find Deal
ons, dec 11 - mån, dec 16
5:05 pm - 2:06 pmSTL-PHL
20h 01m1 stop
10:18 pm - 11:31 pmPHL-STL
26h 13m1 stop
$128Frontier
Find Deal
fre, jan 17 - mån, jan 20
5:45 am - 3:01 pmSTL-PHL
8h 16m1 stop
11:10 am - 12:48 pmPHL-STL
2h 38mnonstop
$330American Airlines
Find Deal
ons, dec 11 - mån, dec 16
6:00 am - 9:12 amSTL-PHL
2h 12mnonstop
11:10 am - 12:48 pmPHL-STL
2h 38mnonstop
$337American Airlines
Find Deal
ons, dec 11 - mån, dec 16
4:40 pm - 9:45 pmSTL-PHL
4h 05m1 stop
7:05 am - 4:55 pmPHL-STL
10h 50m2 stops
$361Southwest
Find Deal
ons, jan 8 - lör, jan 11
6:50 am - 5:05 pmSTL-PHL
9h 15m2 stops
3:55 pm - 8:40 pmPHL-STL
5h 45m1 stop
$381Southwest
Find Deal
ons, dec 11 - mån, dec 16
3:30 pm - 9:20 pmSTL-PHL
4h 50m1 stop
6:00 am - 12:12 pmPHL-STL
7h 12m1 stop
$428United Airlines
Find Deal
mån, mar 17 - ons, mar 19
7:15 am - 2:50 pmSTL-PHL
6h 35m1 stop
7:25 pm - 11:38 pmPHL-STL
5h 13m1 stop
$436Delta
Find Deal
tors, feb 13 - mån, feb 17
10:10 am - 5:29 pmSTL-PHL
6h 19m1 stop
6:20 am - 3:34 pmPHL-STL
10h 14m2 stops
$437United Airlines
Find Deal
ons, dec 11 - mån, dec 16
7:20 am - 3:42 pmSTL-PHL
7h 22m1 stop
6:00 am - 9:43 amPHL-STL
4h 43m1 stop
$447Delta
Find Deal
ons, mar 19 - fre, mar 21
3:53 pm - 1:22 amSTL-PHL
8h 29m1 stop
$54Frontier
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ons, dec 18
7:09 pm - 8:48 pmSTL-PHL
24h 39m1 stop
$62Frontier
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lör, jan 18
5:45 am - 2:49 pmSTL-PHL
8h 04m1 stop
$157American Airlines
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ons, feb 19
6:00 am - 9:12 amSTL-PHL
2h 12mnonstop
$159American Airlines
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ons, dec 18
5:00 pm - 10:52 pmSTL-PHL
4h 52m1 stop
$168Delta
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ons, jan 15
7:00 am - 5:05 pmSTL-PHL
9h 05m2 stops
$173Southwest
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ons, dec 18
8:50 pm - 11:55 pmSTL-PHL
2h 05mnonstop
$179Southwest
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tors, dec 19
5:50 pm - 11:20 pmSTL-PHL
4h 30m1 stop
$188Delta
Find Deal
mån, jan 20
8:25 am - 2:03 pmSTL-PHL
4h 38m1 stop
$214United Airlines
Find Deal
sön, feb 16
5:00 am - 10:24 amSTL-PHL
4h 24m1 stop
$218United Airlines
Find Deal
fre, dec 27
6:32 pm - 7:34 amSTL-PHL
12h 02m1 stop
9:53 pm - 8:13 amPHL-STL
11h 20m1 stop
$178Frontier
Find Deal
lör, nov 23 - tors, dec 12
6:32 pm - 11:17 amSTL-PHL
15h 45m1 stop
8:35 pm - 12:06 amPHL-STL
28h 31m1 stop
$288Frontier
Find Deal
lör, nov 23 - mån, nov 25
6:41 pm - 1:31 amSTL-PHL
5h 50m1 stop
6:11 am - 4:26 pmPHL-STL
11h 15m1 stop
tors, nov 21 - tis, dec 3
6:32 pm - 2:53 pmSTL-PHL
19h 21m1 stop
6:11 am - 4:26 pmPHL-STL
11h 15m1 stop
fre, nov 22 - sön, nov 24
1:46 pm - 4:52 pmSTL-PHL
2h 06mnonstop
7:20 am - 3:30 pmPHL-STL
9h 10m1 stop
$365American Airlines
Find Deal
lör, nov 23 - tors, dec 12
6:00 am - 9:07 amSTL-PHL
2h 07mnonstop
11:10 am - 12:48 pmPHL-STL
2h 38mnonstop
$444American Airlines
Find Deal
lör, nov 23 - tors, dec 12
8:50 pm - 11:55 pmSTL-PHL
2h 05mnonstop
7:45 am - 9:15 amPHL-STL
2h 30mnonstop
$603Southwest
Find Deal
fre, nov 22 - mån, nov 25
1:55 pm - 6:40 pmSTL-PHL
3h 45m1 stop
7:45 am - 9:15 amPHL-STL
2h 30mnonstop
$612Southwest
Find Deal
fre, nov 22 - sön, nov 24
10:10 am - 5:29 pmSTL-PHL
6h 19m1 stop
10:30 am - 9:36 pmPHL-STL
12h 06m2 stops
$769United Airlines
Find Deal
fre, nov 22 - sön, nov 24
1:05 pm - 9:35 pmSTL-PHL
7h 30m1 stop
6:19 am - 3:39 pmPHL-STL
10h 20m2 stops
$897United Airlines
Find Deal
fre, nov 22 - sön, nov 24
6:00 am - 9:12 amSTL-PHL
2h 12mnonstop
11:10 am - 12:48 pmPHL-STL
2h 38mnonstop
$337American Airlines
Find Deal
ons, dec 11 - mån, dec 16
6:05 pm - 9:10 pmSTL-PHL
2h 05mnonstop
2:05 pm - 3:40 pmPHL-STL
2h 35mnonstop
$338Southwest
Find Deal
ons, jan 8 - lör, jan 11
2:10 pm - 5:31 pmSTL-PHL
2h 21mnonstop
11:01 am - 12:39 pmPHL-STL
2h 38mnonstop
$367American Airlines
Find Deal
ons, feb 12 - sön, feb 16
2:00 pm - 5:09 pmSTL-PHL
2h 09mnonstop
11:15 am - 12:50 pmPHL-STL
2h 35mnonstop
$387American Airlines
Find Deal
tors, jan 2 - tors, jan 9
8:50 pm - 11:55 pmSTL-PHL
2h 05mnonstop
7:25 am - 8:55 amPHL-STL
2h 30mnonstop
$388Southwest
Find Deal
tors, dec 19 - sön, dec 22
6:00 am - 9:12 amSTL-PHL
2h 12mnonstop
7:14 pm - 8:59 pmPHL-STL
2h 45mnonstop
$398American Airlines
Find Deal
mån, dec 16 - mån, dec 23
6:30 am - 9:39 amSTL-PHL
2h 09mnonstop
7:14 pm - 8:59 pmPHL-STL
2h 45mnonstop
$417American Airlines
Find Deal
mån, dec 23 - sön, dec 29
6:40 am - 9:50 amSTL-PHL
2h 10mnonstop
10:45 am - 12:29 pmPHL-STL
2h 44mnonstop
$437American Airlines
Find Deal
tors, maj 1 - sön, maj 4
9:20 pm - 12:25 amSTL-PHL
2h 05mnonstop
8:30 pm - 10:00 pmPHL-STL
2h 30mnonstop
$438Southwest
Find Deal
mån, dec 23 - fre, dec 27
6:40 am - 9:47 amSTL-PHL
2h 07mnonstop
7:19 pm - 8:59 pmPHL-STL
2h 40mnonstop
$444American Airlines
Find Deal
fre, nov 29 - tis, dec 3

Frontier flights from St. Louis to Philadelphia

Our best Frontier deals on St. Louis to Philadelphia flight tickets
Frontier
Dec 11
STL5:02 pmLambert-St Louis
14h 43m
1 stop
PHL8:45 amPhiladelphia
Dec 16
PHL5:20 amPhiladelphia
19h 13m
1 stop
STL11:33 pmLambert-St Louis
Frontier
Jan 17
STL5:05 pmLambert-St Louis
20h 01m
1 stop
PHL2:06 pmPhiladelphia
Jan 20
PHL10:18 pmPhiladelphia
26h 13m
1 stop
STL11:31 pmLambert-St Louis
Frontier
Dec 7
STL6:46 pmLambert-St Louis
24h 55m
1 stop
PHL8:41 pmPhiladelphia
Dec 10
PHL7:20 amPhiladelphia
17h 04m
1 stop
STL11:24 pmLambert-St Louis

Spirit Airlines flights from St. Louis to Philadelphia

Our best Spirit Airlines deals on St. Louis to Philadelphia flight tickets
Spirit Airlines
Nov 24
STL5:21 pmLambert-St Louis
30h 56m
2 stops
PHL1:17 amPhiladelphia
Dec 3
PHL6:11 amPhiladelphia
11h 15m
1 stop
STL4:26 pmLambert-St Louis
Spirit Airlines
Dec 7
STL4:26 pmLambert-St Louis
14h 22m
2 stops
PHL7:48 amPhiladelphia
Dec 10
PHL6:15 amPhiladelphia
10h 06m
1 stop
STL3:21 pmLambert-St Louis
Spirit Airlines
Dec 5
STL4:26 pmLambert-St Louis
16h 34m
2 stops
PHL10:00 amPhiladelphia
Dec 8
PHL6:15 amPhiladelphia
10h 06m
1 stop
STL3:21 pmLambert-St Louis

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

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

June. The cheapest time of year to fly to Philadelphia from St. Louis is June. Most expensive is April

What is the cheapest day to depart St. Louis for Philadelphia?

Saturday. The cheapest day of the week is typically Saturday. The most expensive is typically Sunday

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

In the evening. St. Louis to Philadelphia flights are approximately 47% more expensive at noon than in the evening

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

Frontier. Frontier, American Airlines, and Delta are the most popular carriers operating from St. Louis to Philadelphia

What is the cheapest St. Louis to Philadelphia flight route?

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

How far in advance should you book St. Louis to Philadelphia flights?

48 days before. The cheapest time to buy a flight from St. Louis to Philadelphia is approximately 48 days to departure

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

As of November 2024, 6 flights take off from St. Louis and land in Philadelphia each day. The most common flight departure time for this route is 1:00PM, with 46% of daily flights taking off at noon.

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

The number of flights available between St. Louis and Philadelphia is 42 per week as of November 2024. The most frequent departure day is Mon, with 24% of weekly flights leaving on this day.

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

You could potentially save up to 66% 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 November 2024, prices for St. Louis to Philadelphia flights are approximately 1% cheaper 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

$54

Fastest flight time

2h 05m

Direct flights

Mon, Tue, Thu, Fri, Sat and Sun

Airports in Philadelphia

1 airport
The best one-way flight to Philadelphia from St. Louis in the past 72 hours is $54. The best round-trip flight deal from St. Louis to Philadelphia found on momondo in the last 72 hours is $118.
The fastest flight from St. Louis to Philadelphia takes 2h 05m
Direct flights go from St. Louis to Philadelphia on Monday, Tuesday, Thursday, Friday, Saturday and Sunday. Airlines offering direct flights are: Southwest and American Airlines.
There is 1 airport near Philadelphia: Philadelphia (PHL)

  • 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 05m, 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?

  • 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?

  • What is the most popular airline from St. Louis to Philadelphia?


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
FrontierPriceFrom $48Free CancellationRating
6.1
3,542 reviews
Search Frontier flights
United AirlinesPriceFrom $130Free CancellationRating
7.4
9,168 reviews
Search United Airlines flights
American AirlinesPriceFrom $131Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $196Free CancellationRating
8.0
8,766 reviews
Search Delta flights
SouthwestPriceFrom $273Free CancellationRating
8.1
5,022 reviews
Search Southwest flights
  • Southwest Flights From St. Louis to Philadelphia

    Southwest flight deals from St. Louis to Philadelphia start from $273 round-trip. Over the 12 Southwest flights for this route in a normal week, average airfare is usually $391 round-trip - but some users have found much cheaper deals with momondo.

  • American Airlines Flights From St. Louis to Philadelphia

    American Airlines (7.2/10 from 10,000 reviews) operates around 8 flights from St. Louis to Philadelphia in any given week. The average American Airlines airfare for this route is around $300, with deals from around $131 rare but found on momondo. Referenced prices are for round-trip St. Louis to Philadelphia flight searches in the last 72 hours.


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.


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