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Cheap flights from Philadelphia to St. Louis from $53

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Philadelphia to St. Louis departing on 2/12. 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 Philadelphia to St. Louis

Cheap round-trip flights

These are some of the best round-trip flight deals from Philadelphia to St. Louis 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 Philadelphia to St. Louis.

Cheap last minute flights

Planning a quick getaway from Philadelphia to St. Louis? 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 St. Louis, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from Philadelphia to St. Louis

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

All round-trip flight deals to St. Louis

The cheapest plane tickets to St. Louis found on KAYAK recently.
5:20 am - 11:27 pmPHL-STL
19h 07m1 stop
5:05 pm - 11:52 amSTL-PHL
17h 47m1 stop
$118Frontier
Find Deal
Tue, Jan 14 - Tue, Jan 21
10:18 pm - 11:31 pmPHL-STL
26h 13m1 stop
8:22 am - 7:59 amSTL-PHL
22h 37m1 stop
$120Frontier
Find Deal
Mon, Feb 3 - Sun, Feb 9
7:21 am - 4:21 pmPHL-STL
10h 00m1 stop
12:41 pm - 3:51 pmSTL-PHL
2h 10mnonstop
$310American Airlines
Find Deal
Tue, Dec 17 - Tue, Dec 24
11:10 am - 12:48 pmPHL-STL
2h 38mnonstop
12:41 pm - 3:51 pmSTL-PHL
2h 10mnonstop
$317American Airlines
Find Deal
Tue, Dec 17 - Tue, Dec 24
7:20 am - 9:05 amPHL-STL
2h 45mnonstop
6:05 pm - 9:10 pmSTL-PHL
2h 05mnonstop
$328Southwest
Find Deal
Thu, Jan 16 - Tue, Jan 21
4:50 pm - 10:05 pmPHL-STL
6h 15m1 stop
6:50 am - 5:05 pmSTL-PHL
9h 15m2 stops
$351Southwest
Find Deal
Wed, Dec 18 - Wed, Dec 25
6:00 am - 2:36 pmPHL-STL
9h 36m2 stops
8:25 am - 2:03 pmSTL-PHL
4h 38m1 stop
$432United Airlines
Find Deal
Thu, Feb 20 - Sun, Feb 23
6:00 am - 9:33 amPHL-STL
4h 33m1 stop
5:55 pm - 11:14 pmSTL-PHL
4h 19m1 stop
$436Delta
Find Deal
Fri, Dec 20 - Sat, Dec 28
5:10 pm - 9:45 pmPHL-STL
5h 35m1 stop
6:30 am - 6:21 pmSTL-PHL
10h 51m2 stops
$450United Airlines
Find Deal
Tue, Feb 4 - Sat, Feb 8
7:18 pm - 11:41 pmPHL-STL
5h 23m1 stop
6:00 am - 2:09 pmSTL-PHL
7h 09m1 stop
$540Delta
Find Deal
Wed, Dec 4 - Thu, Dec 5
7:45 am - 5:43 pmPHL-STL
10h 58m1 stop
$53Frontier
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Wed, Feb 12
5:28 pm - 11:31 pmPHL-STL
7h 03m1 stop
$59Frontier
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Mon, Jan 27
11:15 am - 12:57 pmPHL-STL
2h 42mnonstop
$159American Airlines
Find Deal
Wed, Jan 29
4:50 pm - 9:49 pmPHL-STL
5h 59m1 stop
$168Delta
Find Deal
Tue, Feb 18
8:45 am - 10:15 amPHL-STL
2h 30mnonstop
$169Southwest
Find Deal
Mon, Jan 6
1:40 pm - 10:10 pmPHL-STL
9h 30m2 stops
$173Southwest
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Wed, Jan 29
7:26 pm - 11:40 pmPHL-STL
5h 14m1 stop
$178Delta
Find Deal
Thu, Dec 19
10:34 am - 12:15 pmPHL-STL
2h 41mnonstop
$179American Airlines
Find Deal
Thu, Nov 28
6:00 am - 2:36 pmPHL-STL
9h 36m2 stops
$183United Airlines
Find Deal
Thu, Feb 20
6:00 am - 12:12 pmPHL-STL
7h 12m2 stops
$208United Airlines
Find Deal
Wed, Feb 19
11:26 pm - 6:40 amPHL-STL
8h 14m1 stop
5:38 pm - 5:31 amSTL-PHL
10h 53m1 stop
$338Frontier
Find Deal
Sat, Nov 23 - Mon, Nov 25
5:01 am - 5:41 pmPHL-STL
13h 40m1 stop
6:41 pm - 1:31 amSTL-PHL
5h 50m1 stop
$348Frontier
Find Deal
Thu, Nov 21 - Thu, Nov 28
11:26 pm - 7:41 amPHL-STL
9h 15m1 stop
5:38 pm - 5:31 amSTL-PHL
10h 53m1 stop
$378Frontier
Find Deal
Thu, Nov 21 - Sun, Nov 24
10:35 am - 12:09 pmPHL-STL
2h 34mnonstop
6:40 am - 9:47 amSTL-PHL
2h 07mnonstop
$637American Airlines
Find Deal
Thu, Nov 21 - Thu, Nov 28
5:40 pm - 11:10 pmPHL-STL
6h 30m1 stop
7:55 am - 11:00 amSTL-PHL
2h 05mnonstop
$647Southwest
Find Deal
Thu, Nov 21 - Thu, Nov 28
6:19 am - 10:01 amPHL-STL
4h 42m1 stop
3:20 pm - 9:35 pmSTL-PHL
5h 15m1 stop
$656United Airlines
Find Deal
Sun, Nov 24 - Fri, Nov 29
10:30 am - 11:28 pmPHL-STL
13h 58m2 stops
6:30 am - 2:20 pmSTL-PHL
6h 50m1 stop
$722United Airlines
Find Deal
Mon, Nov 25 - Fri, Nov 29
7:19 pm - 8:59 pmPHL-STL
2h 40mnonstop
1:46 pm - 4:52 pmSTL-PHL
2h 06mnonstop
$847American Airlines
Find Deal
Fri, Nov 22 - Sun, Nov 24
12:31 pm - 5:15 pmPHL-STL
5h 44m1 stop
6:30 am - 11:46 amSTL-PHL
4h 16m1 stop
$921Delta
Find Deal
Mon, Nov 25 - Sat, Nov 30
8:00 am - 2:59 pmPHL-STL
7h 59m1 stop
6:30 am - 11:46 amSTL-PHL
4h 16m1 stop
$941Delta
Find Deal
Sun, Nov 24 - Sat, Nov 30
11:10 am - 12:48 pmPHL-STL
2h 38mnonstop
12:41 pm - 3:51 pmSTL-PHL
2h 10mnonstop
$317American Airlines
Find Deal
Tue, Dec 17 - Tue, Dec 24
11:15 am - 12:57 pmPHL-STL
2h 42mnonstop
6:00 am - 9:10 amSTL-PHL
2h 10mnonstop
$327American Airlines
Find Deal
Tue, Feb 4 - Sat, Feb 8
7:20 am - 9:05 amPHL-STL
2h 45mnonstop
6:05 pm - 9:10 pmSTL-PHL
2h 05mnonstop
$328Southwest
Find Deal
Thu, Jan 16 - Tue, Jan 21
6:54 pm - 8:41 pmPHL-STL
2h 47mnonstop
6:00 am - 9:10 amSTL-PHL
2h 10mnonstop
$337American Airlines
Find Deal
Thu, Feb 6 - Sat, Feb 8
7:20 am - 9:05 amPHL-STL
2h 45mnonstop
7:10 pm - 10:15 pmSTL-PHL
2h 05mnonstop
$338Southwest
Find Deal
Thu, Jan 16 - Mon, Jan 20
11:01 am - 12:39 pmPHL-STL
2h 38mnonstop
6:00 am - 9:10 amSTL-PHL
2h 10mnonstop
$347American Airlines
Find Deal
Thu, Feb 27 - Mon, Mar 3
8:40 am - 10:20 amPHL-STL
2h 40mnonstop
6:05 pm - 9:10 pmSTL-PHL
2h 05mnonstop
$368Southwest
Find Deal
Wed, Jan 8 - Fri, Jan 10
6:54 pm - 8:41 pmPHL-STL
2h 47mnonstop
6:00 am - 9:10 amSTL-PHL
2h 10mnonstop
$377American Airlines
Find Deal
Thu, Jan 23 - Sun, Feb 2
6:54 pm - 8:41 pmPHL-STL
2h 47mnonstop
6:00 am - 9:10 amSTL-PHL
2h 10mnonstop
$378American Airlines
Find Deal
Mon, Feb 3 - Sun, Feb 9
5:55 pm - 7:25 pmPHL-STL
2h 30mnonstop
8:50 pm - 11:55 pmSTL-PHL
2h 05mnonstop
$383Southwest
Find Deal
Mon, Dec 16 - Thu, Dec 19

Frontier flights from Philadelphia to St. Louis

Our best Frontier deals on Philadelphia to St. Louis flight tickets
Frontier
Jan 14
PHL5:20 amPhiladelphia
19h 07m
1 stop
STL11:27 pmLambert-St Louis
Jan 21
STL5:05 pmLambert-St Louis
17h 47m
1 stop
PHL11:52 amPhiladelphia
Frontier
Feb 3
PHL10:18 pmPhiladelphia
26h 13m
1 stop
STL11:31 pmLambert-St Louis
Feb 9
STL8:22 amLambert-St Louis
22h 37m
1 stop
PHL7:59 amPhiladelphia
Frontier
Jan 23
PHL10:18 pmPhiladelphia
26h 13m
1 stop
STL11:31 pmLambert-St Louis
Feb 2
STL5:05 pmLambert-St Louis
20h 01m
1 stop
PHL2:06 pmPhiladelphia

Spirit Airlines flights from Philadelphia to St. Louis

Our best Spirit Airlines deals on Philadelphia to St. Louis flight tickets
Spirit Airlines
Dec 7
PHL7:27 pmPhiladelphia
20h 54m
2 stops
STL3:21 pmLambert-St Louis
Dec 10
STL4:26 pmLambert-St Louis
16h 34m
2 stops
PHL10:00 amPhiladelphia
Spirit Airlines
Dec 17
PHL6:15 amPhiladelphia
10h 06m
1 stop
STL3:21 pmLambert-St Louis
Dec 24
STL4:27 pmLambert-St Louis
27h 32m
2 stops
PHL8:59 pmPhiladelphia
Spirit Airlines
Dec 6
PHL2:45 pmPhiladelphia
25h 36m
3 stops
STL3:21 pmLambert-St Louis
Dec 24
STL4:27 pmLambert-St Louis
6h 38m
1 stop
PHL12:05 amPhiladelphia

See travel insights to St. Louis from

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

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 Philadelphia to St. Louis?

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

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

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

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

At noon. Philadelphia to St. Louis flights are approximately 30% more expensive in the afternoon than at noon

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

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

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

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

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

You could potentially save up to 66% on your flight if you consider stops on a Philadelphia to St. Louis flight.

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

As of November 2024, prices for Philadelphia to St. Louis flights are approximately 27% cheaper when compared to flights at the same time last year.

When to book flights from Philadelphia to St. Louis

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

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

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

Best Price Found

$53

Fastest flight time

2h 30m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Philadelphia in the past 72 hours is $53. The best round-trip flight deal from Philadelphia to St. Louis found on momondo in the last 72 hours is $118.
The fastest flight from Philadelphia to St. Louis takes 2h 30m
Direct flights go from Philadelphia to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)

  • How far is Philadelphia to Lambert-St Louis by plane?

    There are 808.1 mi between Philadelphia and Lambert-St Louis. Typically, this will take 2h 30m by plane in normal conditions.

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

    Prices for flights from Philadelphia Airport to Lambert-St Louis Airport were last updated today.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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

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


Best airlines flying from Philadelphia to St. Louis

Compare and see reviews for airlines that fly from Philadelphia to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $52Free CancellationRating
6.1
3,539 reviews
Search Frontier flights
American AirlinesPriceFrom $143Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $196Free CancellationRating
7.4
9,173 reviews
Search United Airlines flights
DeltaPriceFrom $200Free CancellationRating
8.0
8,759 reviews
Search Delta flights
SouthwestPriceFrom $238Free CancellationRating
8.1
5,015 reviews
Search Southwest flights
  • Southwest Flights From Philadelphia to St. Louis

    The lowest priced Southwest flight from Philadelphia to St. Louis from the last 72 hours was $238. Generally, Southwest has 12 flights on this route every week with an average price of $403. Southwest is rated 8.1/10 by our users.

  • American Airlines Flights From Philadelphia to St. Louis

    $143 is the best American Airlines flight deal from Philadelphia to St. Louis found on momondo over the last 72 hours. The average American Airlines ticket price found was closer to $299, however, with flight time and availability significantly affecting the price. American Airlines (7.2/10 from 10,000 user reviews) flies into St. Louis from Philadelphia 14 times in an average week so prices can vary.


Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Philadelphia to St. Louis for you.

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

Yes. All flights to St. Louis from Philadelphia on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo provides multiple filters to help you find the best flight to St. Louis from Philadelphia. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Philadelphia and alert you when they change.


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