Which departure time was most reliable for ORD to STL?
Among qualifying ORD-to-STL departure window results, Early morning had the highest on-time rate: 75.7% of 440 flights. Night was lowest at 56.6% across 309 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 440 | 75.7% | 13.0% | 2.0% |
| Late morning | 320 | 73.1% | 17.8% | 1.6% |
| Afternoon | 1,309 | 74.0% | 15.4% | 2.4% |
| Evening | 690 | 58.6% | 28.6% | 3.5% |
| Night | 309 | 56.6% | 31.4% | 4.5% |
Which weekday was most reliable for ORD to STL?
Among qualifying ORD-to-STL weekday results, Tuesday had the highest on-time rate: 75.3% of 446 flights. Sunday was lowest at 63.4% across 448 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 458 | 65.7% | 22.9% | 5.5% |
| Tuesday | 446 | 75.3% | 14.8% | 1.3% |
| Wednesday | 429 | 70.2% | 20.5% | 1.2% |
| Thursday | 451 | 72.5% | 16.0% | 2.4% |
| Friday | 448 | 65.8% | 22.8% | 2.5% |
| Saturday | 388 | 69.8% | 14.7% | 3.6% |
| Sunday | 448 | 63.4% | 26.6% | 2.7% |
Which airline was most reliable for ORD to STL?
Among qualifying ORD-to-STL airline results, Republic Airways had the highest on-time rate: 74.3% of 444 flights. American Airlines was lowest at 63.7% across 535 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| SkyWest Airlines | 834 | 65.0% | 21.9% | 4.2% |
| Envoy Air | 727 | 73.0% | 16.4% | 2.3% |
| American Airlines | 535 | 63.7% | 25.6% | 2.6% |
| United Airlines | 528 | 70.3% | 18.6% | 1.3% |
| Republic Airways | 444 | 74.3% | 16.2% | 2.5% |
Which month was most reliable for ORD to STL?
Among qualifying ORD-to-STL month results, September 2025 had the highest on-time rate: 82.9% of 240 flights. December 2025 was lowest at 56.8% across 241 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 288 | 61.1% | 26.4% | 1.0% |
| August 2025 | 256 | 69.9% | 21.5% | 3.1% |
| September 2025 | 240 | 82.9% | 11.7% | 0.8% |
| October 2025 | 273 | 72.9% | 18.7% | 0.0% |
| November 2025 | 240 | 73.3% | 16.7% | 4.6% |
| December 2025 | 241 | 56.8% | 29.0% | 3.3% |
| January 2026 | 156 | 62.8% | 21.2% | 2.6% |
| February 2026 | 185 | 69.7% | 18.9% | 0.5% |
| March 2026 | 271 | 60.1% | 23.2% | 7.7% |
| April 2026 | 291 | 64.9% | 18.9% | 4.8% |
| May 2026 | 324 | 76.9% | 15.4% | 1.2% |
| June 2026 | 303 | 72.9% | 17.5% | 2.6% |
What drove ORD to STL delay minutes?
Late aircraft was the largest recorded ORD-to-STL delay category, accounting for 43.5% of 62,814 BTS-attributed delay minutes during July 2025–June 2026.
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