Cheapest€103.39
- American Airlines AA145309:552h 16m11:11Philadelphia PHLSt. Louis STL
Door to door 5h 26mCO2 329.6 kgChanges 0Fixed, no changes
Philadelphia to St Louis flight
Flights from Philadelphia to St Louis start at €103.39 and take 5h 16m at their fastest.
Check dates and fares
Fares and seats move by the day. Price Philadelphia to St Louis on the date you actually want, rather than on the date this page was built.
The Flights from Philadelphia to St Louis starts at €103.39 and takes 5h 16m door to door, run by 4 operators over 1,340 km, with around 22 departures a day. Fares bottom out about 60 days before departure.
- 5h 16mDoor to door
- 2h 6mMoving
- €128.76 to €306.35From
- 06:18 to 19:32First and last departure
- 22Per day
- 329.6 kgCO2
First and last are taken from the services we sell on October 6, 2026. The return direction keeps its own timetable and is not these times reversed.
€128.76 to €306.35 for one passenger across the 14 departure dates priced here. The low end is one day, not every day. Worked out from this corridor rather than held for anybody. The operator sets the price on the day.
Fares by date
What this journey usually costs, by departure date. It shows which days run dearer.
Typical fares
- about €306.35Thu17
- about €240.86Fri18
- about €255.02Sat19
- about €193.66Sun20
- about €162.98Mon21
- about €160.62Tue22
- about €174.19Wed23
- about €172.42Thu24
- about €163.57Fri25
- about €163.57Sat26
- about €154.13Sun27
- about €133.48Mon28
- about €128.76Tue29
- about €137.61Wed30
Based on what this route has cost recently. The operator sets the price on the day, and the live fare is confirmed when you book.
The cheapest and the fastest on October 6, 2026
Fastest€126.40
- Republic Airways RA362619:092h 6m20:15Philadelphia PHLSt. Louis STL
Door to door 5h 16mCO2 329.6 kgChanges 0Fixed, no changes
Airlines
| Operator | From |
|---|---|
 American Airlines | €103.39 |
 Frontier Airlines | €106.34 |
 Southwest Airlines | €109.88 |
 Republic Airways | €105.16 |
The flight gets you into St Louis. It does not get you a bed, and neither do we.
A room in St Louis for the night the flight gets in
Sort by distance from Union Station and you can see which places are ten minutes on foot and which are not.
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When to book Philadelphia to St Louis
The same search run across the whole booking window, so the shape of the curve is visible rather than described.
- €106.3490 days
- €100.4460 days
- €112.2445 days
- €111.6530 days
- €108.1121 days
- €137.6114 days
- €174.197 days
- €255.023 days
- €298.991 days
- Cheapest lead time
- Fares bottom out around 60 days ahead, at €100.44.
- How much it moves
- The gap between the cheapest and most expensive lead time is 198 percent. The most expensive point is €298.99, 1 days out.
- What that means
- Today sits inside the cheap window, which closes about 60 days before departure. Waiting from here has usually cost money on this corridor rather than saved it.
Which departure day costs least
Median cheapest fare for each weekday, taken across the next three weeks of real prices.
- €154.13Sun
- €133.48Mon
- €128.76Tue
- €137.61Wed
- €172.42Thu
- €163.57Fri
- €163.57Sat
Where you leave from and where you arrive
Philadelphia
Air
- PHL
- ILG
St. Louis
Air
- STL
What the journey looks like
- Direct or connecting
- 83% of the services we sell on this corridor run through without a change. The remaining 17% involve one connection.
- How far it really runs
- The route covers 1,340 km against 1,301 km in a straight line, a detour of 3 percent. Track and road geometry account for the difference.
- Where the change is
- Connections are made at Pittsburgh, Cincinnati, Columbus, Baltimore. The gap between arriving and leaving is 67 minutes, of which about 14 is walking.
- If the connection is missed
- The tightest connection we sell here has a 14 percent chance of not being made on the timetable alone. Part of this journey is a self transfer between separate tickets, so leave more time than the minimum and expect to check in again.
- First and last departure
- The first service of the day leaves Philadelphia at 06:18 and the last at 19:32, across 22 departures The return direction keeps its own timetable, so the times back are not these times reversed.
Questions about Philadelphia to St Louis
The questions people actually ask about this trip, answered from the same prices and times the page above is built on rather than written once and left to go stale.
How long does the Flight from Philadelphia to St Louis take?
The Flight from Philadelphia to St Louis takes 5h 16m door to door, of which 2h 6m is spent moving. The route runs 1,340 km. The difference between the two times is reaching the terminal and leaving it at the far end, which every time on this page includes.
How much does the Flight from Philadelphia to St Louis cost?
The Flight from Philadelphia to St Louis starts at €103.39 for one passenger, as of September 16, 2026. A typical fare is €126.11. Both are the total including taxes, supplier fees and our service fee, so the price here is the price at checkout.
Who runs the Flight from Philadelphia to St Louis?
4 operators run the Flight from Philadelphia to St Louis: American Airlines, Frontier Airlines, Southwest Airlines, Republic Airways. Between them they file around 22 departures a day. The operator table on this page compares them on fare, journey time, cruising speed, fare conditions and what is provided on board.
Which terminal does the Flight from Philadelphia to St Louis use?
The Flight from Philadelphia to St Louis leaves from Philadelphia PHL and arrives at St. Louis STL. Allow about 3h 10m for reaching the departure terminal and leaving the arrival one. That time is already inside every door to door figure quoted on this page.
When should I book the Flight from Philadelphia to St Louis?
Fares for the Flight from Philadelphia to St Louis bottom out around 60 days ahead, at €100.44. The gap between the cheapest and most expensive lead time across the window is 198 percent, measured on September 16, 2026. Booking inside the final week has consistently cost more.
How much CO2 does the Flight from Philadelphia to St Louis produce?
The Flight from Philadelphia to St Louis produces about 329.6 kg of CO2 per passenger over 1340 km, which works out at roughly 246 grams per passenger kilometer. That figure is for the whole journey and for one traveler, not for the vehicle.
Where these numbers come from
Places, coordinates, operators, which operator serves which pair, and every distance on this page are real and come from open data. Where a corridor has a filed timetable the departure times are real too, and ferry fares are the prices the operators publish themselves.
Derived from service area No carrier record names this exact pair. The operators listed publish a service area covering both places at a distance their mode plausibly carries people, which is evidence that the corridor is served and not evidence of a specific service. Pages state which, because presenting the two as the same thing would be dishonest.
Where no operator publishes a fare for a corridor, the price here is our own estimate, worked out from the real distance and the real operator through a fare curve that follows lead time, day of the week and season. It tells you roughly what the journey costs. It is not a seat anyone has agreed to sell, and the payment step will not take it.
Defined in full at Door to door, Fares, The booking window, Carbon
- On this page
- Every figure above was computed for Philadelphia to St Louis on September 16, 2026: 1340 km of route against 1301 km in a straight line, 22 services a day, 4 operators a cheapest fare of €103.39, and 5h 16m door to door on the fastest mode. The return direction is computed separately and its numbers are not these numbers.
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