Which departure time was most reliable for GRR to ORD?
Among qualifying GRR-to-ORD departure window results, Early morning had the highest on-time rate: 76.6% of 1,232 flights. Evening was lowest at 48.5% across 714 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 1,232 | 76.6% | 12.3% | 2.4% |
| Late morning | 741 | 72.2% | 17.7% | 2.2% |
| Afternoon | 1,331 | 63.3% | 23.1% | 2.4% |
| Evening | 714 | 48.5% | 29.6% | 4.5% |
Which weekday was most reliable for GRR to ORD?
Among qualifying GRR-to-ORD weekday results, Thursday had the highest on-time rate: 69.7% of 591 flights. Sunday was lowest at 61.4% across 586 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 597 | 63.7% | 22.3% | 4.2% |
| Tuesday | 570 | 69.3% | 18.4% | 1.1% |
| Wednesday | 559 | 67.4% | 19.5% | 2.3% |
| Thursday | 591 | 69.7% | 17.3% | 3.4% |
| Friday | 592 | 63.7% | 21.8% | 1.9% |
| Saturday | 543 | 69.6% | 18.2% | 3.3% |
| Sunday | 586 | 61.4% | 21.8% | 3.2% |
Which airline was most reliable for GRR to ORD?
Among qualifying GRR-to-ORD airline results, American Airlines had the highest on-time rate: 72.9% of 532 flights. SkyWest Airlines was lowest at 62.4% across 837 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,075 | 64.3% | 20.3% | 1.3% |
| Envoy Air | 931 | 66.9% | 19.1% | 3.7% |
| SkyWest Airlines | 837 | 62.4% | 24.7% | 3.2% |
| Republic Airways | 661 | 68.8% | 16.6% | 2.9% |
| American Airlines | 532 | 72.9% | 16.9% | 3.4% |
| PSA Airlines | 2 | 0.0% | 100.0% | 0.0% |
Which month was most reliable for GRR to ORD?
Among qualifying GRR-to-ORD month results, May 2026 had the highest on-time rate: 76.5% of 421 flights. December 2025 was lowest at 53.1% across 318 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 329 | 63.8% | 24.0% | 2.4% |
| August 2025 | 315 | 67.3% | 18.4% | 1.6% |
| September 2025 | 308 | 71.8% | 15.6% | 0.6% |
| October 2025 | 359 | 71.0% | 14.5% | 0.3% |
| November 2025 | 359 | 68.5% | 16.2% | 7.0% |
| December 2025 | 318 | 53.1% | 31.1% | 3.1% |
| January 2026 | 284 | 57.0% | 30.3% | 2.1% |
| February 2026 | 287 | 67.9% | 19.2% | 0.3% |
| March 2026 | 336 | 61.6% | 22.6% | 4.2% |
| April 2026 | 442 | 61.8% | 23.5% | 6.1% |
| May 2026 | 421 | 76.5% | 12.8% | 1.2% |
| June 2026 | 280 | 73.9% | 12.9% | 2.9% |
What drove GRR to ORD delay minutes?
Late aircraft was the largest recorded GRR-to-ORD delay category, accounting for 30.9% of 107,571 BTS-attributed delay minutes during July 2025–June 2026.
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