Which departure time was most reliable for IAH to ORD?
Among qualifying IAH-to-ORD departure window results, Early morning had the highest on-time rate: 86.0% of 1,899 flights. Evening was lowest at 61.3% across 1,514 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 1,899 | 86.0% | 7.3% | 1.7% |
| Late morning | 1,064 | 76.0% | 15.3% | 0.8% |
| Afternoon | 1,191 | 65.4% | 21.9% | 1.8% |
| Evening | 1,514 | 61.3% | 26.4% | 1.2% |
| Night | 412 | 74.3% | 17.7% | 2.2% |
Which weekday was most reliable for IAH to ORD?
Among qualifying IAH-to-ORD weekday results, Tuesday had the highest on-time rate: 77.5% of 834 flights. Sunday was lowest at 67.1% across 921 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 901 | 72.7% | 20.1% | 1.6% |
| Tuesday | 834 | 77.5% | 14.7% | 0.8% |
| Wednesday | 814 | 75.3% | 14.7% | 1.4% |
| Thursday | 895 | 75.2% | 14.0% | 1.3% |
| Friday | 908 | 71.5% | 18.6% | 1.4% |
| Saturday | 807 | 74.5% | 15.5% | 1.6% |
| Sunday | 921 | 67.1% | 20.8% | 2.2% |
Which airline was most reliable for IAH to ORD?
Among qualifying IAH-to-ORD airline results, United Airlines had the highest on-time rate: 77.3% of 4,007 flights. Frontier Airlines was lowest at 60.1% across 248 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| United Airlines | 4,007 | 77.3% | 13.6% | 0.6% |
| American Airlines | 798 | 64.5% | 24.6% | 3.5% |
| Envoy Air | 359 | 71.6% | 17.3% | 1.1% |
| Republic Airways | 357 | 68.1% | 20.7% | 3.6% |
| Spirit Airlines | 305 | 63.0% | 25.9% | 4.6% |
| Frontier Airlines | 248 | 60.1% | 30.2% | 2.8% |
| PSA Airlines | 4 | 50.0% | 50.0% | 0.0% |
| SkyWest Airlines | 2 | 50.0% | 50.0% | 0.0% |
Which month was most reliable for IAH to ORD?
Among qualifying IAH-to-ORD month results, September 2025 had the highest on-time rate: 85.7% of 531 flights. July 2025 was lowest at 65.0% across 514 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 514 | 65.0% | 25.5% | 1.6% |
| August 2025 | 535 | 71.6% | 19.1% | 2.1% |
| September 2025 | 531 | 85.7% | 8.7% | 0.2% |
| October 2025 | 517 | 78.7% | 11.6% | 0.6% |
| November 2025 | 466 | 65.9% | 21.2% | 3.6% |
| December 2025 | 512 | 74.2% | 16.2% | 0.6% |
| January 2026 | 467 | 77.5% | 12.8% | 1.3% |
| February 2026 | 435 | 84.6% | 9.4% | 0.5% |
| March 2026 | 514 | 65.2% | 23.0% | 2.5% |
| April 2026 | 525 | 69.9% | 17.0% | 2.9% |
| May 2026 | 539 | 75.1% | 14.1% | 0.0% |
| June 2026 | 525 | 67.0% | 24.8% | 2.1% |
What drove IAH to ORD delay minutes?
Late aircraft was the largest recorded IAH-to-ORD delay category, accounting for 39.4% of 123,865 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.