$43 Find Cheap Flights from Philadelphia to St. Louis - Compare and Save

MetroLink provides train service from the airport to the city center. The train departs from Lambert Airport Terminal 1 station and arrives at Stadium Station. It typically runs 406 times weekly with the duration of the ride being around 45 minutes. Public buses also offer service the route between the airport and the city center with a journey time of around 45 minutes. The cost will vary depending on the bus you choose.

Frontier Airlines offers several seat options, including standard seats, which are the regular seats, and stretch seats, which are seats with additional legroom that are available for purchase for an additional fee, and are often located in the front of the plane or the emergency exit rows. Frontier Airlines offer passengers the option to choose their own seats for a fee, instead of having the airline randomly assign them.

Southwest Airlines allows passengers on flights from Philadelphia to St. Louis to check up to two bags for free as part of the fare, provided that the bags do not exceed 50 lbs in weight and 62 inches in size. Passengers are allowed to bring one carry-on bag and one personal item on board the aircraft. The carry-on bag must not exceed 24 inches in length, 16 inches in width, and 10 inches in height. In addition, passengers will be charged an additional fee of $75 per one-way trip for bags that exceed the weight limit of 50 lbs, up to a maximum weight of 100 lbs.

Alaska Airlines offers several services on economy class flights including limited food and drinks, which may include a choice of snacks or meals, free soft drinks, coffee, and tea on all flights, leather headrests and a wide range of in-flight entertainment options, and standard economy seats with average legroom and seat-back pockets for storage.

Among airlines operating Philadelphia to St. Louis flights:

• American Airlines: offers extra legroom; offers free seat selection
• Southwest: offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

2 airlines operate flights between Philadelphia and St. Louis. The airlines offering nonstop flights on this route include:

• American Airlines
• Southwest

Flights from Philadelphia to St. Louis usually depart from Philadelphia (PHL) and arrive at Lambert-St Louis (STL).

Here are some options for this route, based on selected ticket types and cabin classes:

• American Airlines: a cabin bag and a checked bag in Economy Class
• Southwest: a cabin bag and a checked bag in Economy Class
• JetBlue: a cabin bag in Economy Class class

Bag allowance can vary by ticket type, cabin class, route and airline, so travelers should check the fare details before booking.

Two cabin classes are available on flights from Philadelphia to St. Louis:

• Economy Class
• First Class

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $203 round-trip via Atlanta Hartsfield-Jackson (ATL), compared to $440 for nonstop.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $45–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Airbus A319 family is used most often on this route, operated mainly by American Airlines. Other aircraft seen on the route include Boeing 737-800 Passenger/BBJ2 (winglets) variants.

One-stop flights from Philadelphia to St. Louis most commonly connect through:

• Orlando (MCO) - 51% of one-stop connections
• Atlanta Hartsfield-Jackson (ATL) - 18% of one-stop connections
• Chicago O'Hare Intl (ORD) - 14% of one-stop connections
• Detroit Metropolitan Wayne County (DTW) - 9% of one-stop connections

Orlando (MCO) handles the largest share of one-stop connections on this route.

Yes. Being flexible with your travel dates can save you up to 24% on the Philadelphia to St. Louis route. Wednesday is the cheapest departure day at $370 round-trip on average, while Monday is the most expensive at $481, a difference of $111. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

Morning is the busiest departure period on Philadelphia to St. Louis flights, with 50% of flights leaving in that window. Afternoon departures account for 25%, evening flights for 25%, and night flights for 0%.

Some of the most popular sights in St. Louis are Downtown St. Louis, Busch Stadium and Enterprise Center. These are among the most viewed places in St. Louis on KAYAK.

These are the earliest and latest flight times available from Philadelphia to St. Louis:

• Earliest: departs at 5:00 am and lands at 7:36 am
• Latest: departs at 10:10 pm and lands at 12:46 am.

The flight takes about 2h 36m.

Last-minute fares on this route - booked within 2 weeks of departure - run 71% above the route average of $424. Book 6 weeks before departure for the lowest fares.

A nonstop flight from Philadelphia to St. Louis takes 2h 36m, covering 811 miles.

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID, or another TSA-accepted form of identification.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $277 to $1,249. That means the highest observed fare was about 5x higher than the lowest one.

One-way fares from Philadelphia to St. Louis are currently lower than usual. Average one-way flight prices are about $106, which is 59% below the typical average for this route.

Flying via Chicago Midway (MDW) gives the shortest average 1-stop total travel time at 3h 59m, compared with 4h 19m via Detroit Metropolitan Wayne County (DTW) and 5h 23m via Chicago O'Hare Intl (ORD).

St. Louis is 1 hour behind Philadelphia (Central Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

Lambert-St Louis Airport (STL) hosts 5 major car rental companies, with daily rates starting from around $31 for economy cars. Top options include:
• Hertz
• Budget
• Alamo
• Enterprise Rent-A-Car
• Payless

Round-trip flights from Philadelphia to St. Louis range from $348 to $543, with an average of $424 over the past 12 months. Anything below $348 counts as a good deal.

Two airlines offer in-flight Wi-Fi on Philadelphia to St. Louis flights:

• • American Airlines
• • JetBlue