STL - PHL

$55 Find Cheap Flights from St. Louis to Philadelphia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Philadelphia departing on 11/13. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Philadelphia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Philadelphia, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Philadelphia, as well as popular online travel agencies
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Flight Deals

Cheap Flights from St. Louis to Philadelphia (STL-PHL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Philadelphia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Philadelphia

Thu, Nov 13 - Mon, Nov 17
Frontier Logo
2:12 pm - 9:22 pmSTL-PHL
6h 10m1 stop
Frontier Logo
5:05 am - 1:17 pmPHL-STL
9h 12m1 stop
$110Frontier
Find Deal
Thu, Nov 13 - Sat, Nov 15
Frontier Logo
2:12 pm - 9:22 pmSTL-PHL
6h 10m1 stop
Frontier Logo
6:50 pm - 1:17 pmPHL-STL
19h 27m1 stop
$111Frontier
Find Deal
Fri, Nov 14 - Mon, Nov 17
Frontier Logo
4:56 pm - 12:19 amSTL-PHL
6h 23m1 stop
Frontier Logo
5:05 am - 1:17 pmPHL-STL
9h 12m1 stop
$143Frontier
Find Deal
Wed, Nov 12 - Sun, Nov 16
Frontier Logo
7:45 pm - 4:49 amSTL-PHL
8h 04m1 stop
Frontier Logo
10:32 pm - 9:40 amPHL-STL
12h 08m1 stop
$163Frontier
Find Deal
Wed, Nov 19 - Fri, Nov 21
Multiple Airlines Logo
7:24 pm - 3:04 pmSTL-PHL
18h 40m1 stop
Multiple Airlines Logo
8:54 pm - 8:57 amPHL-STL
13h 03m1 stop
$165Multiple Airlines
Find Deal
Wed, Nov 12 - Sun, Nov 16
Frontier Logo
7:45 pm - 4:49 amSTL-PHL
8h 04m1 stop
Frontier Logo
5:50 am - 10:12 amPHL-STL
5h 22m1 stop
$167Frontier
Find Deal
Thu, Nov 13 - Mon, Nov 17
Multiple Airlines Logo
7:02 pm - 11:52 amSTL-PHL
15h 50m1 stop
Multiple Airlines Logo
10:32 pm - 11:01 pmPHL-STL
49h 29m2 stops
$210Multiple Airlines
Find Deal
Mon, Dec 22 - Wed, Dec 24
American Airlines Logo
1:54 pm - 9:48 pmSTL-PHL
6h 54m1 stop
American Airlines Logo
6:00 am - 2:09 pmPHL-STL
9h 09m1 stop
$303American Airlines
Find Deal
Mon, Dec 22 - Wed, Dec 24
American Airlines Logo
6:35 pm - 11:54 pmSTL-PHL
4h 19m1 stop
American Airlines Logo
6:00 am - 2:09 pmPHL-STL
9h 09m1 stop
$313American Airlines
Find Deal
Wed, Jan 14 - Sat, Jan 17
Delta Logo
9:59 am - 3:52 pmSTL-PHL
4h 53m1 stop
Delta Logo
5:40 am - 11:04 amPHL-STL
6h 24m1 stop
$349Delta
Find Deal

Everything you should know

Our travelers' advice
AI-generated summary based on content written by travel experts
Main Cabin Extra on American offers early boarding.
Use SEPTA trains for a quick trip from PHL to downtown.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Frontier
Cheapest • from $110 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Video guide: How to find cheap flights to Philadelphia
Watch video
Watch video
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When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 37% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
August
Cheapest • 30% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$110
Typical prices: $311-$493
Frontier
Thu 11/13Mon 11/17
STL - PHL • 1 stop
Cheapest non-stop
$319
Typical prices: $357-$692
American Airlines
Wed 1/14Sat 1/17
STL - PHL • Non-stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Philadelphia!
Booking Insights

KAYAK's insights & trends for St. Louis to Philadelphia flights

Get data-powered insights and trends into flights from St. Louis to Philadelphia to help you find the cheapest flights, the best time to fly and much more.

Find cheap flights to Philadelphia
Find cheap flights to Philadelphia

Planning a trip from St. Louis to Philadelphia? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

How much is a round-trip flight from St. Louis to Philadelphia?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Philadelphia departing in November.

What’s the cheapest day of the week to fly from St. Louis to Philadelphia?

The average price of all round-trip flights from St. Louis to Philadelphia clicked on KAYAK for each day over the last 12 months.

For St. Louis to Philadelphia, Thursday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Philadelphia back to St. Louis, the best deals are generally found on Wednesday, with Sunday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Philadelphia, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Philadelphia is August, where tickets cost $277 (return) on average. On the other hand, the most expensive months are March and June, where the average cost of round-trip tickets is $442 and $428 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Philadelphia, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from St. Louis to Philadelphia, you should book around 4 weeks before departure, which saves you about 37% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Expert advice

Expert advice for your flight from St. Louis to Philadelphia

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Qatar Airways

Economy class includes a free checked bag, enhancing value.


Qsuite offers a lie-flat seat with privacy, ideal for comfort.

British Airways

BA's economy fares include a carry-on bag, avoiding surprise fees.


Premium economy offers extra legroom and priority boarding, enhancing comfort.

American Airlines

Main Cabin Extra offers early boarding and complimentary drinks, enhancing comfort.


Download the American Airlines app for inflight entertainment access.

Southwest

Southwest offers free snacks and drinks; download the app for entertainment streaming.


Use Cash + Points for flexible booking options on Southwest flights.

Read more about Southwestby Blane Bachelor
Airports
STL

Avoid peak hours at STL to minimize wait times. Early mornings and afternoons can be particularly crowded.

Read more about STLby Yulia Denisyuk
PHL

Use SEPTA trains for a cost-effective trip to downtown Philadelphia from PHL. The journey takes about 30 minutes.

Read more about PHLby Harriet Baskas
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Qatar Airways

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Duncan Madden

Duncan Madden

Expert on British Airways

Duncan Madden

Duncan Madden

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Read more
Harriet Baskas

Harriet Baskas

Expert on American Airlines and PHL

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Blane Bachelor

Blane Bachelor

Expert on Southwest

Blane Bachelor

Blane Bachelor

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Read more
Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia Denisyuk

Yulia Denisyuk

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Read more

Good to know

Low seasonFebruary
Cheapest flight$55
Best time to beat the crowds with an average 0% drop in price.
Most popular time to fly with an average 4% increase in price.
Flight from St. Louis to Philadelphia

When to book flights from St. Louis to Philadelphia

Are your dates flexible? Find out the best times to travel from St. Louis to Philadelphia based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Philadelphia

  • Does PHL have any pet relief areas?

    If you’re traveling with a pet through Philadelphia International Airport, please ensure that they remain in a safe carrier unless you’re using the pet relief areas. The pet relief areas at PHL are located at multiple points around the airport, including inside the terminals, in the departure areas, and the arrivals areas. For arriving passengers, the most conveniently-located relief areas can be found adjacent to Terminals A-East, Terminal B past baggage claim, and Terminal E along the Commercial Vehicle Roadway.

  • Which is the quickest way from St Louis to STL?

    There are multiple ways through which you can get to STL from the city center. The most popular method and also the most pocket-friendly would be using the metro, which can be boarded from the Civic Center. However, that isn’t the quickest. If you want to get to the airport within a shorter period, taking a taxi or driving via the I-64 W and I-170 N would be more ideal. This will take you about 15 minutes, while the metro will be 40 minutes on a good day.

  • Which airlines have a lounge at STL?

    At the moment, the only airline with a lounge at STL is American Airlines. They have an American Airlines Admirals Club located in Terminal 1 between Concourses B and C near Gate 1. Here you can find complimentary snacks and beverages, comfortable seats, TVs, and Wi-Fi. It is worth mentioning that the airport has other lounges: The USO Lounge and Wingtips Lounge, located in Concourse E on Terminal 2 near Gate E22.

  • How do I get to downtown Philadelphia from PHL?

    You can get to downtown Philly from PHL using multiple means, such as taxis, rental cars, airport shuttle, and public transit. For convenience, taxis and rental cars are a better choice since they are easily available at the airport and will take you to any destination in Philly. However, they are significantly more expensive compared to public transport.

  • What is the cheapest flight from St. Louis to Philadelphia?

    In the last 3 days, the lowest price for a flight from St. Louis to Philadelphia was $55 for a one-way ticket and $110 for a round-trip.

  • Do I need a passport to fly between St. Louis and Philadelphia?

    No

  • Which airports will I be using when flying from St. Louis to Philadelphia?

    When flying out of St. Louis you will be using Lambert-St Louis. You will be landing at Philadelphia, also known as Philadelphia.

  • Which airlines offer Wi-Fi service onboard planes from St. Louis to Philadelphia?

    American Airlines, Air Canada, and Delta offer inflight Wi-Fi service on the St. Louis to Philadelphia flight route.

  • Which aircraft models fly most regularly from St. Louis to Philadelphia?

    The Airbus A319 is the aircraft model that flies most regularly on the St. Louis to Philadelphia flight route.

  • Which airline alliances offer flights from St. Louis to Philadelphia?

    oneworld is the only airline alliance operating flights between St. Louis and Philadelphia.

  • On which days can I fly direct from St. Louis to Philadelphia?

    There are nonstop flights from St. Louis to Philadelphia on a daily basis.

  • Which is the best airline for flights from St. Louis to Philadelphia, Southwest or American Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Philadelphia are Southwest and American Airlines. With an average price for the route of $421 and an overall rating of 8.0, Southwest is the most popular choice. American Airlines is also a great choice for the route, with an average price of $418 and an overall rating of 7.2.

  • How does KAYAK find such low prices on flights from St. Louis to Philadelphia?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Philadelphia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Philadelphia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Philadelphia from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Philadelphia?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Philadelphia with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and PHL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Philadelphia?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Philadelphia from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from St. Louis to Philadelphia

  • Looking for a cheap flight? 25% of our users found flights on this route for $221 or less one-way and $394 or less round-trip.
  • If you want to leave your car at St. Louis Lambert International Airport (STL), please ensure that you compare the rates charged by airport parking to those charged by offsite parking companies. In most cases, the offsite parking lots charge lower rates compared to airport parking, and you even get a free shuttle to the terminals.
  • Traveling moms will be happy to know that PHL has multiple nursing suites where you can privately breastfeed your child. The Mamava Suites are located in four different areas; in Terminals A West and Terminal F, as well as the B/C and D/E Connectors. These nursing suites are available for free to all travelers.
  • To save on flight costs, consider booking your flight tickets in advance and be flexible with your travel dates. For example, avoid traveling on holidays and weekends since the ticket demand is usually higher on such days, so airlines will charge higher prices for these tickets.
  • Consider booking direct flights instead of connecting flights to make your trip more sustainable. This is because direct flights are shorter and therefore end up burning less fuel leading to lower carbon emissions compared to connecting flights.
  • If you need specific in-flight services such as Wi-Fi, please confirm their availability during the booking. This is because different flights tend to offer varying services even when serviced by the same airline.

Prefer to fly direct from St. Louis to Philadelphia?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Lambert-St Louis to Philadelphia.
Find which airlines fly direct from Lambert-St Louis Airport to Philadelphia Airport, which days they fly and book direct flights.

Direct departures

Lambert-St Louis to Philadelphia

Monday

American Airlines, Southwest

American Airlines, Southwest

Tuesday

American Airlines, Southwest

American Airlines, Southwest

Wednesday

American Airlines, Southwest

American Airlines, Southwest

Thursday

American Airlines, Southwest

American Airlines, Southwest

Friday

American Airlines, Southwest

American Airlines, Southwest

Saturday

American Airlines, Southwest

American Airlines, Southwest

Sunday

American Airlines, Southwest

American Airlines, Southwest

See more direct flights

Direct returns

Philadelphia to Lambert-St Louis

Monday

American Airlines, Southwest

American Airlines, Southwest

Tuesday

American Airlines, Southwest

American Airlines, Southwest

Wednesday

American Airlines, Southwest

American Airlines, Southwest

Thursday

American Airlines, Southwest

American Airlines, Southwest

Friday

American Airlines, Southwest

American Airlines, Southwest

Saturday

American Airlines, Southwest

American Airlines, Southwest

Sunday

American Airlines, Southwest

American Airlines, Southwest

See more direct flights

Reviews of the top 4 airlines serving from St. Louis to Philadelphia

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Philadelphia. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Philadelphia? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4242 reviews
8.0Comfort
8.1Boarding
7.5Entertainment
8.6Crew
7.0Food
Airline reviews

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

8.0 ExcellentGreg, Oct 2025OAK - BUR
Read more Southwest reviews

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

All was good. I just had a hard time getting connected to the WiFi/internet during the flight

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

Great flight. Outstanding Service. Southwest was able to put us on a direct flight to Denver when the connection could have been affected by a later arrival to Baltimore. The direct flight was less expensive that the flight with the connection in Baltimore.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

Flight was delayed due to plane not passing inspection And one of the crew had to time out and we had to wait for another one A 3 hour delay

the trip to madrid was uncomfortable with my legs touching the seat in front of me

Very crowded flight but what can you expect these days?? Crew was accommodating.

The seats in economy were appeared to be quite thin and lack sufficient cushioning to be comfortable. Perhaps it was my seating position but the plane seemed notably load.

Internet was a bit expensive and did not work ask that week otherwise a good flight

The flight had a delay that made me being in a real rush to take the second flight. The delay was almost for 2 hours. They moved us from gate to gate in 4 times. Once I arrived to Philadelphia, I got to run thorough all the airport, as the train was already closed by that time. So I got sick with asthma for all the running I had to do. And I was the last one to board, when it was almost closed. So irresponsable with the people

The plane was probably full boarding was easy. We were able to check our carry-on luggage for free. It was a return flight through Philly to LA. Never saw a stewardess do a demonstration of emergency Procedures. I think my flight was pretty full

Overall, a good experience. The food, however, was subpar. The breakfast was a joke.

I was late from Jacksonville, FL but the limited interaction I had with the Philly crew was great.

The delays and cancellations kept me stuck in Miami for an additional 24 hours, and the whole thing seemed extremely disorganized

Everything was great except British airways lost our luggage that was gate checked all the way through to Italy. No one knows currently where one is and the other one may be in route to Amsterdam to meet us but not sure. If you can Hale’s it would be awesome. The website is not helpful.

the plane was not full so the flight attendant had me move to an empty row which made for a good flight. The software for logging on and booking and confirming the flight is much too cumbersome.

Always comes in handy when I want a quick weekend getaway.

For the price I could have taken a “name brand” airline. No drink no snack and constant emails trying to get addition money for EVERYTHING other airlines include in the price. It looks cheaper but it’s Judy bait and switch and emails non stop!

The gate agents for spirit at EWR wouldn’t give me my ticket to board when I arrived 50 min from the flight, saying that I wouldn’t make my flight. They tried to reschedule me to arrive at my destination 14 hours after the original flight, which included a 10 hr layover in another city. I rebooked with another airline and it took me a total of 5 min to go through security. Then I see a charge on my card for a $100 change fee that I did not approve. Beware of this horrible place and these horrible people

Excessive fees for flight delays. What a Scam. I was not able to attend the wedding I needed to go.

Waited at the airport for over 4 hours to board this flight. Terrible airline

Was supposed to take off 8:00 last night. Got delayed till 8:00 this morning

It was terrible, we had to board and unboard the flight with a hour delay that caused me to miss an appointment and a surprise for my wife

When the flight ticket is expensive and you have to purchase check in luggage and there is no snacks, no entertainment, tight seats stuffed in the back of the plane not such good experience. I would like some to reach out to me . I paid for check luggage when I bought the ticket they made me pay again on the return flight extra $70. Very frustrating.

Excellent experience when I am looking for a budget airline where the main expectation is getting me from point A to point B with no frills.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

Boarding was on time and plane departed as scheduled. There are obviously no amenities (food, drink, entertainment) on Frontier, but there also didn't seem to be any issues with luggage space either.

Inbound plane was on time and flight departed on time with no issues while boarding.

I knew going into this that Frontier, being a low cost carrier, would be pretty bare bones and charge for most extras but this was made up for by the fact that the airplane was a reasonably new Airbus, every employee was great and best of all, Everett Washington is an amazing airport - thanks Frontier for flying there!!!

i was unable to check in the flight. refund requested

It was well done. It was my first time flying with them and I was nervous b/c I have heard of many cancelled and/or delray flights. Everything went smoothly.

Just know that everything, and I mean everything is “ala cart”. 60$ just to put something in the overhead bin. I will never fly Frontier again nor do I recommend them to anyone else.

The single worst check in experience I could imagine. I’ll never do any business with Frontier or any affiliated company

Too many extra fees, uncomfortable, little leg room. Will not recommend this airline.

Everyone seemed to be in zone 1 for boarding. Maybe break it up a little. Otherwise, smooth flight.

Everything you need to know for your flight from St. Louis to Philadelphia

Information on your arrival and departure airports

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