St Louis to Philadelphia flights

Find your dates. Discover your next journey.

Fare seen

€158Seen on 12 Sep 2026

Last checked

8 Oct 2026

Observed fares. Prices may change.

Your next trip, last seen at €51

16 Oct 2026

One way

Cheapest observed day · Last checked: 12 Sep 2026

When to fly

Explore dates

Find the dates that work for you

The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.

Prices are for observed departure and return date pairs. No data does not mean no flights.

Airlines seen: Southwest Airlines, American Airlines, Delta Air Lines, Frontier Airlines
Reported fastest flight: 2h 19m
Non-stop: Yes

Short answer

We have seen Southwest Airlines fares from St Louis to Philadelphia, non-stop. These are prices our searches returned on the dates shown, not quotes; run a live search for today's fare. Fare seen: €158 on 12 Sep 2026.

About this route

Explore the fares we observed from St Louis to Philadelphia. Prices move often, so pick your dates to see the latest options.

Route distance: 1,301 km
Reported fastest flight: 2h 19m
Airlines seen: Southwest Airlines, American Airlines, Delta Air Lines, Frontier Airlines
Alternative airports: SUS, TTN

Route-level information; individual journeys vary.
Published schedules report non-stop service with Southwest Airlines. Check current timetables.

A clearer picture of your fare

Observed, not guaranteed

Every price is a fare we actually saw, and it may change at any time.

Compare the same trip

We show like-for-like journeys so the comparison is fair.

Confirm with the provider

The price is final on the provider's site, where your booking is completed.

How our prices work

Airport to city: straight-line distance

St. Louis Lambert International Airport (STL) → St Louis, city gazetteer reference point (38.6270, -90.1994): ≈ 20 km.
Philadelphia International Airport (PHL) → Philadelphia, city gazetteer reference point (39.9523, -75.1638): ≈ 11 km.
Trenton Mercer Airport (TTN) → Philadelphia, city gazetteer reference point (39.9523, -75.1638): ≈ 47 km.

Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.