Cheap Flights from St Louis to Philadelphia
No deal from St Louis to Philadelphia has cleared our price bar yet. What we have seen on the route is below.
Across 4 months of observations from St Louis to Philadelphia, the lowest round-trip fare we recorded was $176, in September. The typical fare was $279. September was the cheapest month we saw and July the dearest.
The most recent price we saw on this route was $365 on Frontier, seen Oct 16. It is an unverified observation and may have changed.
See every deal <a href="/from/st-louis">from St Louis</a>, <a href="/to/philadelphia">to Philadelphia</a>, or the return direction <a href="/from/philadelphia/to/st-louis">Philadelphia to St Louis</a>.
Latest price we saw: St Louis to Philadelphia
The most recent round-trip fare our sweep found on this route. It is not verified and may have changed since the date shown.
| From | Price | Per mile | Travel dates | Airline | Seen | Check price |
|---|---|---|---|---|---|---|
| St Louis (STL) to Philadelphia (PHL) | $365 | 22.5¢ | Nov 5 – Nov 11 | Frontier | Oct 16 | Check price |
Price history: St Louis to Philadelphia
What we observed by month, from our signals database. Unverified observations, not bookable prices.
| Month | Low | Typical | Sightings |
|---|---|---|---|
| Oct 2026 | $196 | $335 | 35 |
| Sep 2026 | $176 | $260 | 98 |
| Aug 2026 | $218 | $276 | 114 |
| Jul 2026 | $245 | $245 | 1 |
Frequently asked questions
How many flight deals from St Louis to Philadelphia are on Sparkflights right now?
There are 0 verified deals from St Louis to Philadelphia on the board right now. The list refreshes hourly.
What is the lowest price ever seen from St Louis to Philadelphia?
The lowest fare we've recorded from St Louis to Philadelphia is $176, based on 248 price observations over 4 months.
How much does a flight from St Louis to Philadelphia cost?
The typical round-trip fare we observed from St Louis to Philadelphia is $279, against a recorded low of $176. These are observations, not quotes.
When is the cheapest month to fly St Louis to Philadelphia?
September was the cheapest month we observed from St Louis to Philadelphia and July the dearest, over 4 months of data.
What is the current price from St Louis to Philadelphia?
The most recent fare our sweep saw from St Louis to Philadelphia is $365, on Oct 16. It is an unverified observation rather than a verified deal, so check it before booking.