Which departure time was most reliable for ORD to BUF?
Among qualifying ORD-to-BUF departure window results, Early morning had the highest on-time rate: 85.0% of 494 flights. Night was lowest at 39.1% across 92 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 494 | 85.0% | 7.7% | 1.4% |
| Late morning | 228 | 69.7% | 18.4% | 3.9% |
| Afternoon | 696 | 72.8% | 16.7% | 3.2% |
| Evening | 685 | 55.9% | 30.8% | 2.2% |
| Night | 92 | 39.1% | 35.9% | 5.4% |
Which weekday was most reliable for ORD to BUF?
Among qualifying ORD-to-BUF weekday results, Tuesday had the highest on-time rate: 72.9% of 317 flights. Sunday was lowest at 59.4% across 315 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 325 | 68.6% | 19.4% | 2.8% |
| Tuesday | 317 | 72.9% | 17.7% | 1.9% |
| Wednesday | 313 | 69.0% | 21.7% | 1.6% |
| Thursday | 324 | 70.7% | 17.9% | 2.2% |
| Friday | 317 | 68.5% | 18.9% | 1.9% |
| Saturday | 284 | 71.1% | 19.0% | 2.8% |
| Sunday | 315 | 59.4% | 25.7% | 5.4% |
Which airline was most reliable for ORD to BUF?
Among qualifying ORD-to-BUF airline results, Envoy Air had the highest on-time rate: 77.5% of 422 flights. American Airlines was lowest at 58.0% across 476 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| United Airlines | 612 | 72.9% | 17.0% | 1.1% |
| American Airlines | 476 | 58.0% | 30.3% | 1.3% |
| Envoy Air | 422 | 77.5% | 13.5% | 2.6% |
| Republic Airways | 355 | 70.1% | 16.1% | 5.1% |
| SkyWest Airlines | 330 | 62.7% | 23.6% | 4.8% |
Which month was most reliable for ORD to BUF?
Among qualifying ORD-to-BUF month results, September 2025 had the highest on-time rate: 77.7% of 179 flights. March 2026 was lowest at 58.8% across 182 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 214 | 61.7% | 31.8% | 0.0% |
| August 2025 | 183 | 73.2% | 18.0% | 1.6% |
| September 2025 | 179 | 77.7% | 12.8% | 0.6% |
| October 2025 | 181 | 75.7% | 11.6% | 0.0% |
| November 2025 | 189 | 69.3% | 15.9% | 6.3% |
| December 2025 | 165 | 63.6% | 23.0% | 4.8% |
| January 2026 | 164 | 67.1% | 20.7% | 5.5% |
| February 2026 | 127 | 70.1% | 19.7% | 0.8% |
| March 2026 | 182 | 58.8% | 28.6% | 5.5% |
| April 2026 | 185 | 66.5% | 18.4% | 3.2% |
| May 2026 | 217 | 70.5% | 18.0% | 1.4% |
| June 2026 | 209 | 69.4% | 20.6% | 2.4% |
What drove ORD to BUF delay minutes?
Late aircraft was the largest recorded ORD-to-BUF delay category, accounting for 48.5% of 49,945 BTS-attributed delay minutes during July 2025–June 2026.
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