Which departure time was most reliable for ATL to STL?
Among qualifying ATL-to-STL departure window results, Early morning had the highest on-time rate: 89.4% of 781 flights. Evening was lowest at 71.5% across 910 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 781 | 89.4% | 5.6% | 1.7% |
| Late morning | 615 | 86.3% | 7.3% | 1.5% |
| Afternoon | 991 | 80.8% | 10.2% | 1.1% |
| Evening | 910 | 71.5% | 17.7% | 2.0% |
| Night | 409 | 78.2% | 13.9% | 1.5% |
Which weekday was most reliable for ATL to STL?
Among qualifying ATL-to-STL weekday results, Wednesday had the highest on-time rate: 89.1% of 513 flights. Sunday was lowest at 72.6% across 563 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 562 | 76.2% | 14.8% | 1.1% |
| Tuesday | 520 | 86.3% | 8.1% | 0.8% |
| Wednesday | 513 | 89.1% | 7.2% | 0.2% |
| Thursday | 564 | 80.7% | 8.7% | 0.7% |
| Friday | 559 | 80.9% | 12.5% | 2.0% |
| Saturday | 425 | 82.6% | 9.2% | 2.8% |
| Sunday | 563 | 72.6% | 15.6% | 3.4% |
Which airline was most reliable for ATL to STL?
Among qualifying ATL-to-STL airline results, Delta Air Lines had the highest on-time rate: 82.8% of 2,371 flights. Frontier Airlines was lowest at 68.3% across 205 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Delta Air Lines | 2,371 | 82.8% | 9.7% | 2.0% |
| Southwest Airlines | 1,130 | 79.5% | 12.2% | 0.5% |
| Frontier Airlines | 205 | 68.3% | 20.0% | 2.0% |
Which month was most reliable for ATL to STL?
Among qualifying ATL-to-STL month results, September 2025 had the highest on-time rate: 92.1% of 317 flights. March 2026 was lowest at 74.6% across 283 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 351 | 77.2% | 15.1% | 0.9% |
| August 2025 | 331 | 81.3% | 11.8% | 1.5% |
| September 2025 | 317 | 92.1% | 4.4% | 0.0% |
| October 2025 | 348 | 85.6% | 8.9% | 0.0% |
| November 2025 | 285 | 78.2% | 12.6% | 3.5% |
| December 2025 | 311 | 78.1% | 13.8% | 1.3% |
| January 2026 | 279 | 79.6% | 8.6% | 4.7% |
| February 2026 | 254 | 80.7% | 9.4% | 0.8% |
| March 2026 | 283 | 74.6% | 13.8% | 2.8% |
| April 2026 | 299 | 81.6% | 9.7% | 2.0% |
| May 2026 | 330 | 80.3% | 11.5% | 0.9% |
| June 2026 | 318 | 81.1% | 11.9% | 0.9% |
What drove ATL to STL delay minutes?
Airline was the largest recorded ATL-to-STL delay category, accounting for 43.8% of 35,727 BTS-attributed delay minutes during July 2025–June 2026.
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