Which departure time was most reliable for ATL to ORD?
Among qualifying ATL-to-ORD departure window results, Early morning had the highest on-time rate: 83.0% of 1,100 flights. Evening was lowest at 50.7% across 1,563 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 1,100 | 83.0% | 8.7% | 2.1% |
| Late morning | 1,437 | 79.5% | 11.1% | 1.5% |
| Afternoon | 1,723 | 68.3% | 19.0% | 1.9% |
| Evening | 1,563 | 50.7% | 29.9% | 3.3% |
| Night | 583 | 63.6% | 22.6% | 3.6% |
Which weekday was most reliable for ATL to ORD?
Among qualifying ATL-to-ORD weekday results, Wednesday had the highest on-time rate: 72.9% of 898 flights. Monday was lowest at 64.5% across 956 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 956 | 64.5% | 21.8% | 2.8% |
| Tuesday | 915 | 71.5% | 17.6% | 1.6% |
| Wednesday | 898 | 72.9% | 14.5% | 1.2% |
| Thursday | 933 | 68.5% | 18.6% | 1.9% |
| Friday | 946 | 68.1% | 18.5% | 2.0% |
| Saturday | 820 | 70.2% | 18.0% | 2.6% |
| Sunday | 938 | 64.9% | 19.8% | 4.2% |
Which airline was most reliable for ATL to ORD?
Among qualifying ATL-to-ORD airline results, Spirit Airlines had the highest on-time rate: 82.7% of 75 flights. Frontier Airlines was lowest at 61.0% across 711 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Delta Air Lines | 2,625 | 67.0% | 17.9% | 2.2% |
| United Airlines | 1,611 | 72.7% | 16.7% | 1.6% |
| Frontier Airlines | 711 | 61.0% | 27.6% | 2.7% |
| American Airlines | 688 | 69.9% | 18.5% | 3.1% |
| Envoy Air | 364 | 69.8% | 18.4% | 2.2% |
| Republic Airways | 287 | 67.6% | 15.0% | 5.9% |
| Spirit Airlines | 75 | 82.7% | 9.3% | 0.0% |
| SkyWest Airlines | 40 | 80.0% | 7.5% | 5.0% |
| PSA Airlines | 5 | 100.0% | 0.0% | 0.0% |
Which month was most reliable for ATL to ORD?
Among qualifying ATL-to-ORD month results, September 2025 had the highest on-time rate: 84.3% of 541 flights. March 2026 was lowest at 54.3% across 516 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 570 | 64.6% | 25.3% | 2.8% |
| August 2025 | 573 | 76.6% | 14.0% | 1.7% |
| September 2025 | 541 | 84.3% | 7.9% | 0.2% |
| October 2025 | 569 | 75.6% | 12.7% | 0.0% |
| November 2025 | 526 | 63.3% | 20.5% | 5.3% |
| December 2025 | 487 | 58.7% | 25.5% | 2.9% |
| January 2026 | 445 | 67.0% | 20.4% | 2.0% |
| February 2026 | 445 | 75.5% | 12.4% | 0.0% |
| March 2026 | 516 | 54.3% | 26.6% | 5.6% |
| April 2026 | 554 | 64.3% | 19.1% | 3.1% |
| May 2026 | 596 | 71.5% | 17.1% | 1.2% |
| June 2026 | 584 | 66.1% | 20.5% | 3.3% |
What drove ATL to ORD delay minutes?
National airspace was the largest recorded ATL-to-ORD delay category, accounting for 37.8% of 147,333 BTS-attributed delay minutes during July 2025–June 2026.
Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.