Cheap flights from Philadelphia to St. Louis (PHL - STL) from $97

Sunday flights are found to be more expensive to fly from Philadelphia to St. Louis. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to St. Louis.

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 30 days in advance, which can save you up to 29% on flights from Philadelphia to St. Louis compared to booking the week you need them. Waiting 30 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $418. For sooner than that we have options available in the next 3 days from $525.

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, September can be a great choice for travel to St. Louis. Flights to St. Louis from Philadelphia in September are about $404 on average during September, but can be found for as low as $168.

It’s optimal to fly from Philadelphia to St. Louis in the morning. By choosing this option you can save up to 13% on the cost of your flight, compared to a flight in the afternoon.

Lambert-St Louis is the airport most travelers will use when flying to St. Louis from Philadelphia. Booking flights from Philadelphia (PHL) to Lambert-St Louis (STL) should be relatively easy as there are 3 daily flights to St. Louis from 4 different airlines. 2h 20m is how long a flight from Philadelphia to Lambert-St Louis will take if you book a nonstop flight.

American Airlines, Frontier, and Delta are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

Yes, there are multiple flights from Philadelphia to St. Louis for under $200. The cheapest flight booked recently is on Spirit Airlines for just $194, but on average you can expect to pay $225.

Cheapflights has at least 20 direct flights from Philadelphia to St. Louis under $300. A good price for a nonstop flight from Philadelphia to St. Louis is less than $413.

There are currently 20+ open flights from Philadelphia to St. Louis within the next 7 days for less than $300.

You can find nonstop flights on the following days: Sunday, Tuesday, Wednesday, Thursday, Friday, Saturday.

Per day, 13 flights depart from Philadelphia to St. Louis on average.
Morning (6am - Noon) - 8% of flight departures
Evening (6pm - Midnight) - 92% of flight departures

Airlines like Spirit Airlines and Frontier fly from Philadelphia to St. Louis in about 12h 17m. The time it takes to get you to your destination can typically vary by up to 1h 21m. The distance between Philadelphia and St. Louis is about 816 mi. This flight may include one or multiple stops.

Cheapflights users have booked flights from Philadelphia to St. Louis round-trip from $194. Another airline that can offer you cheap pricing is Frontier. These flights start at 52% lower than the current average price 3 months from now.

The cheapest airline one-way is Spirit Airlines, with whom users have recently found tickets for as low as $97. However, be on the lookout for offers from Frontier and American Airlines, as they are both options that can get you from Philadelphia to St. Louis for a low price.

When booking a flight from Philadelphia to St. Louis, you may want to consider flying on American Airlines, Delta or Frontier as they are the most popular for this route.

Consider Republic Airways (97%), American Airlines (89%) or PSA Airlines (87%) when booking your flight. These represent the most reliable airlines when flying from Philadelphia to St. Louis.

Looking for the cheapest flight from Philadelphia to St. Louis? While on average our users pay $329, our data indicates the cheapest price to be $138. The most popular route (Philadelphia - Lambert-St Louis), is priced around $194.

PHL stands for Philadelphia Airport, while STL stands for Lambert-St Louis Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.