Route Reliability
St. Louis → Philadelphia
STL–PHL · 814 miles · St. Louis Lambert International Airport to Philadelphia International Airport
- 80%
- Arrive within 15 minutes
- 10 min
- Average arrival delay
- 1.5%
- Cancelled
- 1,572
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.American Airlines82%849 flights
- 2.Southwest Airlines78%723 flights
What the data says
Morning flights do better here.
STL–PHL flights departing between 6–9 AM arrived on time 91% of the time, versus 60% between 3–6 PM.
Sunday scaries are real for this one.
STL–PHL flights arrived on time 85% of the time on Wednesdays. On Sundays: 75%.
American Airlines has a slight edge here.
American Airlines arrived on time 82% of the time on this route; Southwest Airlines managed 78%.
Recent months have been rougher.
STL–PHL flights arrived on time 77% of the time over the last three months in the data, compared with 88% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon79%(236 flights)
- Tue79%(217 flights)
- Wed85%(215 flights)
- Thu83%(230 flights)
- Fri78%(236 flights)
- Sat82%(166 flights)
- Sun75%(244 flights)
- 3–6 AM88%(17 flights)
- 6–9 AM91%(537 flights)
- 9 AM–12 PM86%(172 flights)
- 12–3 PM79%(367 flights)
- 3–6 PM60%(193 flights)
- 6–9 PM68%(236 flights)
- 9 PM–12 AM64%(22 flights)
Jun 75% → May 72% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 75% | 129 |
| July 2025 | 67% | 129 |
| August 2025 | 81% | 141 |
| September 2025 | 82% | 132 |
| October 2025 | 82% | 146 |
| November 2025 | 85% | 161 |
| December 2025 | 80% | 147 |
| January 2026 | 89% | 97 |
| February 2026 | 94% | 77 |
| March 2026 | 73% | 115 |
| April 2026 | 86% | 128 |
| May 2026 | 72% | 142 |
Keep nerding
Based on 1,572 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.