Route · STL → PHL · 2020–2025 BTS data
St. Louis to Philadelphia
The STL–PHL corridor (St. Louis, MO → Philadelphia, PA) runs ahead of the national average, served by 29 carriers across roughly 814 miles.
Data updated 2026-06-13
- 83.5%
- On-time
- +4.5 pts
- vs US avg
- 82 min
- Delay when late
- 8,317
- Flights
Cancelled
1.9%
Best Month
May 2025 89%
Worst Month
Jul 2025 68%
Distance
814 mi
Carriers
29
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 148 | 32 | 1 | 0 | YX,OH,WN,AA |
| Nov 2025 | 162 | 25 | 1 | 0 | OH,AA,WN,YX |
| Oct 2025 | 147 | 26 | 0 | 1 | AA,WN,YX |
| Sep 2025 | 132 | 24 | 0 | 0 | WN,AA |
| Aug 2025 | 142 | 29 | 0 | 1 | AA,WN,YX |
| Jul 2025 | 135 | 43 | 5 | 1 | AA,WN,YX |
| Jun 2025 | 132 | 34 | 3 | 0 | AA,OH,WN,YX |
| May 2025 | 118 | 13 | 3 | 0 | AA,OH,WN |
| Apr 2025 | 115 | 16 | 1 | 0 | OH,WN,AA |
| Mar 2025 | 105 | 17 | 2 | 0 | OH,WN |
| Feb 2025 | 78 | 14 | 3 | 0 | OH,WN,YX |
| Jan 2025 | 91 | 15 | 10 | 1 | OH,WN,YX |
| Dec 2024 | 133 | 30 | 0 | 0 | AA,OH,WN,YX |
| Nov 2024 | 129 | 18 | 1 | 0 | WN,YX,OH,AA |
| Oct 2024 | 187 | 22 | 0 | 0 | WN,YX,AA,OH |
| Sep 2024 | 172 | 20 | 0 | 0 | WN,YX,AA |
| Aug 2024 | 201 | 48 | 10 | 1 | AA,F9,WN,YX |
| Jul 2024 | 198 | 53 | 11 | 2 | AA,F9,WN,YX |
| Jun 2024 | 186 | 37 | 3 | 1 | AA,F9,WN,YX |
| May 2024 | 120 | 32 | 2 | 0 | AA,F9,WN |
| Apr 2024 | 86 | 15 | 0 | 0 | AA,WN |
| Mar 2024 | 80 | 14 | 0 | 0 | AA,WN |
| Feb 2024 | 62 | 9 | 0 | 0 | AA,WN |
| Jan 2024 | 72 | 17 | 2 | 0 | AA,WN |
Cancellation Rate
1.9%
58 of 3,131 flights
Diversion Rate
0.3%
8 of 3,131 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
STL - St. Louis
Full on-time, delay-cause, and seasonal performance for St. Louis, MO.
Origin airport →PHL - Philadelphia
Full on-time, delay-cause, and seasonal performance for Philadelphia, PA.
Destination airport →Compare the two airports
See STL and PHL side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to STL–PHL.
Routes with a similar on-time rate
Routes of a similar trip length
What the Data Says About STL to PHL
Bureau of Transportation Statistics records show St. Louis to Philadelphia (STL to PHL) running a 83.5% on-time rate over 8,317 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 82.2 minutes. The 814-mile corridor is served by 29 carriers, and over the last 24 months 1.9% of 3,131 flights were cancelled, 0.3% diverted.
The monthly split is wide on this route: May 2025 posted the strongest performance at 89% on-time, while Jul 2025 came in at just 68% - a 21-point swing worth factoring into travel timing.
Frequently Asked Questions
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.