Which departure time was most reliable for STL to ORD?
Among qualifying STL-to-ORD departure window results, Early morning had the highest on-time rate: 79.1% of 930 flights. Evening was lowest at 57.6% across 780 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 930 | 79.1% | 13.1% | 2.2% |
| Late morning | 302 | 75.5% | 18.2% | 1.7% |
| Afternoon | 1,056 | 65.8% | 21.9% | 3.6% |
| Evening | 780 | 57.6% | 25.0% | 4.6% |
Which weekday was most reliable for STL to ORD?
Among qualifying STL-to-ORD weekday results, Tuesday had the highest on-time rate: 72.3% of 441 flights. Sunday was lowest at 64.4% across 450 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 457 | 64.6% | 23.4% | 5.9% |
| Tuesday | 441 | 72.3% | 16.3% | 1.8% |
| Wednesday | 433 | 71.6% | 17.1% | 2.8% |
| Thursday | 450 | 70.0% | 17.3% | 2.7% |
| Friday | 449 | 66.8% | 19.8% | 3.6% |
| Saturday | 390 | 72.1% | 17.4% | 2.8% |
| Sunday | 450 | 64.4% | 25.6% | 2.9% |
Which airline was most reliable for STL to ORD?
Among qualifying STL-to-ORD airline results, American Airlines had the highest on-time rate: 78.6% of 533 flights. SkyWest Airlines was lowest at 59.7% across 836 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| SkyWest Airlines | 836 | 59.7% | 27.2% | 4.9% |
| Envoy Air | 728 | 72.7% | 17.3% | 2.6% |
| American Airlines | 533 | 78.6% | 13.7% | 2.4% |
| United Airlines | 525 | 67.4% | 18.3% | 1.5% |
| Republic Airways | 448 | 69.0% | 18.1% | 4.0% |
Which month was most reliable for STL to ORD?
Among qualifying STL-to-ORD month results, February 2026 had the highest on-time rate: 83.2% of 185 flights. March 2026 was lowest at 60.1% across 271 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 289 | 60.2% | 26.0% | 1.7% |
| August 2025 | 255 | 66.3% | 18.4% | 3.9% |
| September 2025 | 239 | 80.3% | 12.1% | 0.8% |
| October 2025 | 274 | 70.4% | 17.9% | 0.0% |
| November 2025 | 241 | 64.7% | 22.4% | 4.6% |
| December 2025 | 240 | 60.8% | 30.0% | 2.9% |
| January 2026 | 156 | 67.9% | 22.4% | 4.5% |
| February 2026 | 185 | 83.2% | 9.7% | 0.5% |
| March 2026 | 271 | 60.1% | 22.9% | 8.1% |
| April 2026 | 294 | 67.7% | 19.0% | 5.1% |
| May 2026 | 322 | 78.9% | 13.0% | 1.9% |
| June 2026 | 304 | 67.1% | 21.1% | 4.3% |
What drove STL to ORD delay minutes?
National airspace was the largest recorded STL-to-ORD delay category, accounting for 32.3% of 82,778 BTS-attributed delay minutes during July 2025–June 2026.
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