Which departure time was most reliable for IAH to ATL?
Among qualifying IAH-to-ATL departure window results, Early morning had the highest on-time rate: 82.4% of 1,661 flights. Evening was lowest at 67.4% across 1,193 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 1,661 | 82.4% | 9.9% | 2.3% |
| Late morning | 791 | 78.0% | 11.3% | 2.4% |
| Afternoon | 1,258 | 74.6% | 16.9% | 1.0% |
| Evening | 1,193 | 67.4% | 20.0% | 1.8% |
Which weekday was most reliable for IAH to ATL?
Among qualifying IAH-to-ATL weekday results, Wednesday had the highest on-time rate: 82.5% of 681 flights. Sunday was lowest at 68.7% across 709 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 746 | 74.4% | 15.0% | 2.5% |
| Tuesday | 666 | 78.4% | 13.1% | 1.4% |
| Wednesday | 681 | 82.5% | 10.9% | 0.7% |
| Thursday | 743 | 79.1% | 12.1% | 0.4% |
| Friday | 734 | 75.2% | 15.5% | 1.9% |
| Saturday | 627 | 73.8% | 16.3% | 2.7% |
| Sunday | 709 | 68.7% | 17.8% | 3.8% |
Which airline was most reliable for IAH to ATL?
Among qualifying IAH-to-ATL airline results, United Airlines had the highest on-time rate: 81.2% of 1,257 flights. Frontier Airlines was lowest at 60.4% across 767 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Delta Air Lines | 2,507 | 78.5% | 11.9% | 2.1% |
| United Airlines | 1,257 | 81.2% | 12.0% | 0.7% |
| Frontier Airlines | 767 | 60.4% | 25.7% | 2.2% |
| Spirit Airlines | 375 | 74.1% | 15.5% | 4.3% |
Which month was most reliable for IAH to ATL?
Among qualifying IAH-to-ATL month results, September 2025 had the highest on-time rate: 90.9% of 384 flights. March 2026 was lowest at 61.4% across 440 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 413 | 70.7% | 18.6% | 1.5% |
| August 2025 | 379 | 78.6% | 14.2% | 1.3% |
| September 2025 | 384 | 90.9% | 4.4% | 0.3% |
| October 2025 | 438 | 80.1% | 11.0% | 0.2% |
| November 2025 | 401 | 77.8% | 14.5% | 2.5% |
| December 2025 | 367 | 75.7% | 13.9% | 3.0% |
| January 2026 | 395 | 77.7% | 12.4% | 4.3% |
| February 2026 | 381 | 85.0% | 9.7% | 0.5% |
| March 2026 | 440 | 61.4% | 21.4% | 6.8% |
| April 2026 | 466 | 79.0% | 11.8% | 0.4% |
| May 2026 | 446 | 69.7% | 20.4% | 0.4% |
| June 2026 | 396 | 67.9% | 18.7% | 1.8% |
What drove IAH to ATL delay minutes?
Late aircraft was the largest recorded IAH-to-ATL delay category, accounting for 40.0% of 71,932 BTS-attributed delay minutes during July 2025–June 2026.
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