Cheap Flights from St Louis (STL) to Philadelphia (PHLA)

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Travellers and cabin class, 1 Adult, Economy

Compare St Louis to Philadelphia flight deals

Find the cheapest month or even day of the year to fly to Philadelphia

Book the best Philadelphia fare with no extra fees

Flight deals Cheapest month Find the best route Route info FAQs Tips and advice

Flight deals from St Louis to Philadelphia

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to Philadelphia? If you want to travel next month, return fares start from £61. Find the lowest prices on one-way and return tickets right here.

Philadelphia.£28 per passenger.Departing Wed, 7 Oct.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 7 Oct, arriving in Philadelphia International.Price includes taxes and charges.From £28, select.

Philadelphia.£48 per passenger.Departing Wed, 16 Dec.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 16 Dec, arriving in Philadelphia International.Price includes taxes and charges.From £48, select.

Philadelphia.£61 per passenger.Departing Wed, 30 Sep.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 30 Sep, arriving in Philadelphia Trenton-Mercer.Price includes taxes and charges.From £61, select.

Philadelphia.£97 per passenger.Departing Fri, 20 Nov.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 20 Nov, arriving in Philadelphia International.Price includes taxes and charges.From £97, select.

Philadelphia.£102 per passenger.Departing Tue, 6 Oct.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Tue, 6 Oct, arriving in Philadelphia International.Price includes taxes and charges.From £102, select.

Philadelphia.£150 per passenger.Departing Thu, 10 Dec.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Thu, 10 Dec, arriving in Philadelphia International.Price includes taxes and charges.From £150, select.

Philadelphia.£176 per passenger.Departing Wed, 7 Apr.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Wed, 7 Apr, arriving in Philadelphia International.Price includes taxes and charges.From £176, select.

Philadelphia.£176 per passenger.Departing Wed, 5 May.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Wed, 5 May, arriving in Philadelphia International.Price includes taxes and charges.From £176, select.

Philadelphia.£182 per passenger.Departing Fri, 7 May.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Fri, 7 May, arriving in Philadelphia International.Price includes taxes and charges.From £182, select.

Philadelphia.£188 per passenger.Departing Sun, 27 Sep.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Sun, 27 Sep, arriving in Philadelphia International.Price includes taxes and charges.From £188, select.

Philadelphia.£188 per passenger.Departing Tue, 24 Nov.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Tue, 24 Nov, arriving in Philadelphia International.Price includes taxes and charges.From £188, select.

Philadelphia.£195 per passenger.Departing Sun, 3 Jan.One-way flight with United.Outbound indirect flight with United, departs from St Louis on Sun, 3 Jan, arriving in Philadelphia International.Price includes taxes and charges.From £195, select.

Philadelphia.£197 per passenger.Departing Thu, 1 Jul.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Thu, 1 Jul, arriving in Philadelphia International.Price includes taxes and charges.From £197, select.

Philadelphia.£210 per passenger.Departing Sun, 3 Jan.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Sun, 3 Jan, arriving in Philadelphia International.Price includes taxes and charges.From £210, select.

Philadelphia.£225 per passenger.Departing Thu, 1 Jul.One-way flight with American Airlines.Outbound direct flight with American Airlines departs from St Louis on Thu, 1 Jul, arriving in Philadelphia International.Price includes taxes and charges.From £225, select.

Find the cheapest month to fly from St Louis to Philadelphia

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Philadelphia flights are currently cheapest in October.

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Direct flights from St Louis to Philadelphia

Alternative St Louis to Philadelphia routes

Looking for the cheapest, fastest or easiest route from St Louis to Philadelphia? You could fly into the following airports instead.

St Louis to Philadelphia: Flight information

The things to know before you go.

Cheapest flight found	£28
Cheapest month to fly	October
Average flight time	2 hrs, 16 mins
Most popular airline	American Airlines
Average flights per week	118

Finding cheap flights from St Louis to Philadelphia: Frequently asked questions

How many airports are there in Philadelphia?

There are 5 airports in Philadelphia: Philadelphia International, Philadelphia Trenton-Mercer, Greater Wilmington, Atlantic City International, and Allentown.

How much are return flights from St Louis to Philadelphia?

The best price we found for a return flight from St Louis to Philadelphia is £60. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from St Louis to Philadelphia?

2 hours and 16 minutes is the average flight time from St Louis to Philadelphia.

Which airlines fly direct from St Louis to Philadelphia?

American Airlines, Qatar Airways and Southwest Airlines fly direct from St Louis to Philadelphia.

How many flights are there a week from St Louis to Philadelphia?

As of September 2026, there are 118 flights per week flying from St Louis to Philadelphia.

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

The cheapest month to fly from St Louis to Philadelphia is usually September.

Which is the cheapest airport to fly into in Philadelphia?

If you're flying from St Louis Airport, the cheapest airport near Philadelphia is Philadelphia International – which is 7.0 miles away from the centre of Philadelphia. We've found flights into this airport from £60.

Which upcoming date is cheapest to fly from St Louis Airport to Philadelphia on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Philadelphia on Wednesday, 30 September 2026.

Can I get a direct flight from St Louis Airport to Philadelphia?

Yes – the average flight time is 2 hours and 16 minutes.

How can I get the best flight deal from St Louis Airport to Philadelphia?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Philadelphia but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Philadelphia?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Philadelphia is around 40 days in advance, so don’t leave your flight to the last minute.

What’s the weather like in Philadelphia?

In September, the average temperature is usually around 21°C. July is typically the warmest month in Philadelphia, when it usually averages around 31°C. You can expect the least rain in November. The coldest month is January, with temperatures averaging -1°C. The rainiest month is July.

Which is the cheapest airline to fly from St Louis Airport to Philadelphia with?

Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to Philadelphia.

Flying from St Louis Lambert International Airport (STL) to Philadelphia: what you need to know

Approximately 2 hours 35 minutes is how long you can expect to be in the air on a direct flight from St Louis Lambert International Airport to Philadelphia.
St Louis Lambert International Airport is located in St Louis. Following the UTC-5 timezone, Philadelphia is one hour ahead of St Louis.
The most popular route is from St Louis Lambert International Airport (STL) to Philadelphia International Airport (PHL). Choose from 27 services every week between these two airports. If you want to get on your way as soon as possible, the earliest flight from STL to PHL is the 06:00 American Airlines option. If you prefer to travel later, the final departure is at 21:00 with Southwest Airlines.
To avoid missing your STL to Philadelphia flight, leave enough time for things like check-in and baggage drop. Turning up two hours ahead of international departures and an hour before domestic flights is the general rule.
You'll likely experience longer queues during popular months such as July. Arriving up to four hours ahead of an international flight and two hours for a domestic departure is a good idea.
You can book a direct St Louis Lambert International Airport to Philadelphia ticket. Begin your trip at STL and land at Philadelphia International Airport (PHL).
Keep your eyes peeled for promotions from American Airlines. This airline has direct flights from St Louis Lambert International Airport to Philadelphia.
The journey from central St Louis to STL takes around 30 minutes by public transport. If you drive, ride-share or get a taxi, you'll cover the 16 kms (10 miles) in 25 minutes or so, depending on traffic conditions.
Catching an early flight from St Louis Lambert International Airport to Philadelphia? Avoid the hassle of rushing to the airport (and enjoy a little extra shut-eye) by choosing one of these stays near STL:
When it comes to St Louis Lambert International Airport's on-time performance, 76% of flights stick to their scheduled arrival time.
You'll find STL at 10701 Lambert International Blvd..

How to find the cheapest flights from St Louis Lambert International Airport (STL) to Philadelphia

The best price we've seen for a one-way St Louis Lambert International Airport to Philadelphia flight is £28. The cheapest price for a return flight is £60. Bear in mind fares may change due to availability at the time of booking.
To pick up cheap flights from STL to Philadelphia, reserve your journey one month ahead of your planned departure.
Organise your trip for June. That's the best month for landing a bargain on St Louis Lambert International Airport to Philadelphia tickets. If you're open to different travel dates, use the 'Whole month' tool to find the lowest price across each month.
Save time looking for cheap flights from STL to Philadelphia by creating a Price Alert. We'll send you an email or push notification on the app when a lower fare pops up.
Find a cheap flight from St Louis Lambert International Airport to Philadelphia with the help of our filters. Choose your ideal times, airlines and number of stops, then sort the results by 'Cheapest' to see the best deals.

Airports in Philadelphia

Philadelphia International Airport (PHL)

Philadelphia International Airport (PHL) is around 18 kms (11 miles) from central Philadelphia. If you're opting for a ride-share or a taxi, the drive will take roughly 20 minutes.
Travelling on public transport will take you around 30 minutes.
The last thing you want is a long journey to your hotel if you're arriving on a late flight from St Louis Lambert International Airport to Philadelphia. Book one of these accommodation options near PHL instead:
Lock in the best possible rate by booking your vehicle from Philadelphia International Airport around three weeks before your flight from STL to Philadelphia.
PHL is located at 8500 Essington Ave.

Trenton-Mercer Airport (TTN)

Central Philadelphia is around 48 kms (30 miles) from Trenton-Mercer Airport (TTN). After your flight from St Louis Lambert International Airport to Philadelphia has hit the runway and you've made your way through the terminal, the drive should take about 40 minutes.
Public transport will get you there in about 1 hour 35 minutes.
You'll find some great places to call home for the night near TTN. Unwind and get cosy after your STL to Philadelphia flight at one of these perfectly located options:
Call dibs on the best options. Reserving your ride from TTN four weeks ahead of time often means lower prices and a wider range of vehicles.
The address for Trenton-Mercer Airport is Scotch Road, Terminal Building.

Best time to go to Philadelphia

July is the busiest month for flights from St Louis Lambert International Airport to Philadelphia. To avoid the crowds, visit Philadelphia in December.
The warmest month in Philadelphia is July, with temperatures ranging between 18ºC and 32ºC. Book your St Louis Lambert International Airport to Philadelphia plane ticket then if that's your ideal forecast.
January has average temperatures of between -7ºC and 9ºC. Search for a cheap ticket from STL to Philadelphia around that time if you'd rather travel in cooler conditions.

More about Philadelphia

Start your Philadelphia trip right by choosing the perfect place to stay. As soon as you've booked your flight from St Louis Lambert International Airport to Philadelphia, browse our selection of accommodation options including:
Liberty Bell and Independence Hall are just a couple of the top-rated attractions to put on your Philadelphia to-do list. Continue your sightseeing adventures at Philadelphia Museum of Art.

Explore more of the United States

Philadelphia has loads to offer, but there are so many other parts of the United States just waiting to be discovered. About 129 kms (80 miles) northeast of Philadelphia, a visit to New York will keep your itinerary busy. Start with attractions like Central Park, Statue of Liberty and Metropolitan Museum of Art.
Around 434 kms (270 miles) northeast of Philadelphia, Boston is another favourite stop in the United States. Get a taste of what this destination has to offer at Museum of Fine Arts Boston, Freedom Trail and USS Constitution Museum.