Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Philadelphia from $88

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 6/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.

Find the cheapest flights from St. Louis to Philadelphia

Cheap round-trip flights

KAYAK's recommended round-trip deals from the most popular airlines that fly from St. Louis to Philadelphia.
Frontier Logo
5:45 pm - 10:11 pmSTL-PHL
27h 26m1 stop
Frontier Logo
3:52 pm - 12:06 amPHL-STL
9h 14m1 stop
$181Frontier
Find Deal
อ., พ.ค. 13 - ส., พ.ค. 17
Frontier Logo
5:45 pm - 7:36 amSTL-PHL
12h 51m1 stop
Frontier Logo
4:33 pm - 12:06 amPHL-STL
8h 33m1 stop
$188Frontier
Find Deal
พ., พ.ค. 7 - อา., พ.ค. 11
 Logo
10:10 am - 10:43 pmSTL-PHL
11h 33m1 stop
 Logo
10:59 pm - 12:06 amPHL-STL
26h 07m1 stop
พฤ., พ.ค. 15 - อา., พ.ค. 18
 Logo
10:10 am - 10:43 pmSTL-PHL
11h 33m1 stop
 Logo
4:00 pm - 6:41 pmPHL-STL
27h 41m2 stops
พฤ., พ.ค. 15 - อา., พ.ค. 18
American Airlines Logo
3:47 pm - 7:30 amSTL-PHL
14h 43m1 stop
American Airlines Logo
10:53 am - 12:27 pmPHL-STL
2h 34mnonstop
$293American Airlines
Find Deal
ส., พ.ค. 24 - อา., พ.ค. 25
Southwest Logo
8:25 am - 11:35 amSTL-PHL
2h 10mnonstop
Southwest Logo
8:05 am - 9:30 amPHL-STL
2h 25mnonstop
$301Southwest
Find Deal
อ., มิ.ย. 3 - พ., มิ.ย. 4
Southwest Logo
8:25 am - 11:35 amSTL-PHL
2h 10mnonstop
Southwest Logo
6:30 am - 11:50 amPHL-STL
6h 20m1 stop
$311Southwest
Find Deal
อ., มิ.ย. 3 - พ., มิ.ย. 4
American Airlines Logo
6:00 am - 9:11 amSTL-PHL
2h 11mnonstop
American Airlines Logo
10:53 am - 12:27 pmPHL-STL
2h 34mnonstop
$320American Airlines
Find Deal
จ., พ.ค. 26 - พ., พ.ค. 28
Delta Logo
6:40 am - 11:56 amSTL-PHL
4h 16m1 stop
Delta Logo
5:01 pm - 8:30 pmPHL-STL
4h 29m1 stop
$321Delta
Find Deal
อ., ก.ค. 1 - ส., ก.ค. 5
Delta Logo
9:28 am - 2:59 pmSTL-PHL
4h 31m1 stop
Delta Logo
8:00 am - 2:37 pmPHL-STL
7h 37m1 stop
$340Delta
Find Deal
พ., มิ.ย. 18 - ส., ก.ค. 5

Frontier flights from St. Louis to Philadelphia

Our best Frontier deals on St. Louis to Philadelphia flight tickets
Frontier
May 13
STL5:45 pmLambert-St Louis
27h 26m
1 stop
PHL10:11 pmPhiladelphia
May 17
PHL3:52 pmPhiladelphia
9h 14m
1 stop
STL12:06 amLambert-St Louis
Frontier
May 7
STL5:45 pmLambert-St Louis
12h 51m
1 stop
PHL7:36 amPhiladelphia
May 11
PHL4:33 pmPhiladelphia
8h 33m
1 stop
STL12:06 amLambert-St Louis
Frontier
May 5
STL9:55 pmLambert-St Louis
31h 57m
1 stop
PHL6:52 amPhiladelphia
May 7
PHL6:54 pmPhiladelphia
27h 11m
1 stop
STL9:05 pmLambert-St Louis

Southwest flights from St. Louis to Philadelphia

Our best Southwest deals on St. Louis to Philadelphia flight tickets
Southwest
Jun 3
STL8:25 amLambert-St Louis
2h 10m
PHL11:35 amPhiladelphia
Jun 4
PHL8:05 amPhiladelphia
2h 25m
STL9:30 amLambert-St Louis
Southwest
Jun 3
STL8:25 amLambert-St Louis
2h 10m
PHL11:35 amPhiladelphia
Jun 4
PHL6:30 amPhiladelphia
6h 20m
1 stop
STL11:50 amLambert-St Louis
Southwest
Jun 3
STL8:25 amLambert-St Louis
2h 10m
PHL11:35 amPhiladelphia
Jun 4
PHL12:15 pmPhiladelphia
10h 35m
2 stops
STL9:50 pmLambert-St Louis

See travel insights to Philadelphia from

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 to Philadelphia?

The cheapest month to fly to Philadelphia from St. Louis is in June. Flight prices, which tend to average around $201, are often lower during this time because this is during the off-season. The month of July is another great option to travel to Philadelphia, with average flight prices from St. Louis averaging around $208.

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 $581. On the other hand, Sunday 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 $827.

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 $227. 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 $1,102.

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 to Philadelphia?

You are more likely to see cheaper flights to Philadelphia from St. Louis when booking 2 weeks ahead of your departure date. In general, you can expect to find flights to Philadelphia for around $330 when searching 2 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 $238 on momondo.

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

There are 4 cabin classes available to choose from on Lambert-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.

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

As of April 2025, prices for St. Louis to Philadelphia flights are approximately 34% 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

$88

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 $88. The best round-trip flight deal from St. Louis to Philadelphia found on momondo in the last 72 hours is $181.
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 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 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?

  • 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
5.9
3,283 reviews
Search Frontier flights
American AirlinesPriceFrom $131Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $196Free CancellationRating
8.0
7,920 reviews
Search Delta flights
SouthwestPriceFrom $284Free CancellationRating
8.0
4,286 reviews
Search Southwest flights
  • Southwest Flights From St. Louis to Philadelphia

    Southwest flight deals from St. Louis to Philadelphia start from $284 round-trip. Over the 10 Southwest flights for this route in a normal week, average airfare is usually $411 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 14 flights from St. Louis to Philadelphia in any given week. The average American Airlines airfare for this route is around $302, 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.


Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Wildwood
Rehoboth Beach
Cape May
Ocean City
Wildwood Crest
Reading
King of Prussia
Newark
Dover
Cherry Hill
North Wildwood
Dewey Beach
Lewes
Exton
Vineland
Essington
New Castle
Pottstown
Avalon
Stone Harbor

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.


An easier way to manage your Philadelphia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
From?
To?
อา. 4/27
อา. 5/4

Find better results for your trip to the United States