Flight tickets from Philadelphia to St Louis

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Flight deals from Philadelphia to St Louis Airport

Looking for a cheap last-minute deal or the best return flight from Philadelphia to St Louis Airport? If you want to travel next month, return fares start from ₹ 13,159. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Philadelphia to St Louis

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

Direct flights from Philadelphia to St Louis

Philadelphia to St Louis: Alternative routes

Compare routes from Philadelphia to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

Philadelphia to St Louis: Flight information

The things to know before you go.
Cheapest flight found₹ 6,580
Cheapest month to flyApril
Average flight time2 hrs, 39 mins
Most popular airlineAmerican Airlines
Average flights per week71

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

The best price we found for a return flight from Philadelphia to St Louis is ₹ 13,159. 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.
2 hours and 39 minutes is the average flight time from Philadelphia to St Louis.
American Airlines, Qatar Airways and Southwest Airlines fly direct from Philadelphia to St Louis.
As of March 2026, there are 142 flights per week flying from Philadelphia to St Louis.
The cheapest month to fly from Philadelphia to St Louis is usually April.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Philadelphia to St Louis Airport on Monday, 20 April 2026.
Yes – the average flight time is 2 hours and 39 minutes.
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 St Louis 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.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.

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

  • Start your journey at one of Philadelphia's main airports, Philadelphia International Airport (PHL) or Trenton-Mercer Airport (TTN). Explore your options for booking a flight from Philadelphia to Lambert-St. Louis International Airport (STL) taking off from either of these.

  • 2 hours 30 minutes is the average travel time for a direct Philadelphia to Lambert-St. Louis International Airport flight.

  • St Louis is one hour behind Philadelphia. Lambert-St. Louis International Airport is located in St Louis, which follows the UTC-5 timezone.

  • The most popular route is from Philadelphia International Airport (PHL) to Lambert-St. Louis International Airport (STL), with 25 direct weekly services. If you're ready to head out sooner, the earliest flight from PHL to STL is the 6:45am Southwest Airlines service. If a later flight fits your day better, the last departure is at 8:35pm with Southwest Airlines.

  • For a stress-free journey, arrive at the airport two hours ahead of international flights and an hour before domestic departures. This ensures you have enough time to catch your flight from Philadelphia to STL.

  • In high season, allow for longer wait times and be there earlier. Aim for at least two hours ahead for domestic flights and up to four hours for international journeys.

Airports in Philadelphia

Philadelphia International Airport (PHL)

  • Philadelphia International Airport (PHL) is a convenient option for travelling directly to your destination. Nonstop flights from Philadelphia to Lambert-St. Louis International Airport (STL) take off from this terminal.

  • You can travel on a direct flight from Philadelphia to Lambert-St. Louis International Airport with American Airlines. This well-known airline operates services from PHL.

  • The top choice among passengers flying between PHL and STL is American Airlines.

  • Among carriers operating on this route, Southwest Airlines has the best track record for timely arrivals.

  • Located around 19 kilometres from central Philadelphia, PHL can be reached in about 15 minutes by car (depending on traffic). The journey on public transport takes roughly 45 minutes.

  • Catching an early flight from Philadelphia to Lambert-St. Louis International Airport? Avoid the mad dash to the terminal (and sneak in some bonus sleep) by staying at one of these stays close to Philadelphia International Airport:

  • When it comes to Philadelphia International Airport's on-time performance, 78.93% of flights stick to their scheduled arrival time.

  • PHL is located at 8500 Essington Ave.

Trenton-Mercer Airport (TTN)

  • On public transport, you can travel from central Philadelphia to TTN in around 1 hour 45 minutes. The airport is roughly 56 kilometres away, and making the journey by car will take approximately 40 minutes.

  • Get your holiday started early with an extra night away from home. Before your Philadelphia to STL flight, kick back in one of these hotels close to Trenton-Mercer Airport:

  • Trenton-Mercer Airport has earned its reputation for punctuality. 82.45% of flights taking off from here keep to their planned arrival schedule.

  • The address for TTN is Scotch Road, Terminal Building.

About Lambert-St. Louis International Airport (STL)

Getting from Lambert-St. Louis International Airport (STL) to central St Louis

  • Lambert-St. Louis International Airport to central St Louis is around 16 kilometres. If you're taking a cab or renting a car, do a little research to make your trip as smooth as possible. Journey times may vary based on the time of day and traffic conditions.

  • When travelling on public transport, expect a journey of about 35 minutes.

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

  • ₹ 6,580 is currently the best price for a one-way ticket from Philadelphia to Lambert-St. Louis International Airport. Return flights start at ₹ 13,159. These fares can change depending on availability and demand.

  • Don't leave things to the last minute. You're more likely to walk away with cheap flights from Philadelphia to STL if you book in advance. Airlines often have some amazing early bird rates.

  • Affordable Philadelphia to Lambert-St. Louis International Airport tickets are easier to find when your dates are flexible. Use the 'Whole month' search function to compare fares across every month and then pick the cheapest day.

  • There's no need to check every day to find out if fares have dropped when you set up a Price Alert. We'll notify you the moment a new deal shows up on flight tickets from Philadelphia to STL.

  • Lock in a cheap flight from Philadelphia to Lambert-St. Louis International Airport by using the search filters. Choose your preferred times, airlines and number of stops, then sort the results by 'Cheapest' for the best deals.

The best time to fly from Philadelphia to Lambert-St. Louis International Airport (STL)

  • April is the quietest month for flights from Philadelphia to Lambert-St. Louis International Airport (STL), while July is the most popular. Choose the best time to go to St Louis based on whether you prefer a lively atmosphere or a more laid-back vibe.

  • The warmest month in St Louis is July, with temperatures ranging between 17ºC and 33ºC. Lock in your Philadelphia to STL flight ticket then if that's your ideal forecast.

  • Look for cheap tickets from Philadelphia to Lambert-St. Louis International Airport in January if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between -8ºC and 7ºC.

More about St Louis

Explore more of the United States

  • You've done St Louis, now it's time to discover other parts of the United States. Travel about 257 kilometres east to Evansville to check off its top sights. From Mesker Park Zoo to Riverfront Park and Evansville Zoological Society, your itinerary will be busy.

  • Around 177 kilometres west of St Louis, Columbia is another favourite stop in the United States. Experience the best of this destination with a visit to Sentinel Park, Museum of Art and Archaeology and Bur Oak Brewing Company.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.