Best Time to Fly ORD to ROC: On-Time Stats by Hour & Airline
Chicago O'Hare International → Frederick Douglass Grtr Rochester International
Data through July 2026 · Last updated October 18, 2026
2,336 flights were scheduled from Chicago (ORD) to Rochester (ROC) in the last 12 months, and 74.2% of those that flew arrived on time, 3.4 points below the US average of 77.6%.
Among 4 airlines, Republic Airways led with 80.3% on time and SkyWest Airlines was last with 63.0%.
Over 24 months, Tuesday was the most reliable day (79% on time) and February the worst month (67%).
The cancellation rate was 2.4% (US average 1.8%).
ORD to ROC on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Republic Airways | 80.3% | 68 min | 2.0% | 700 |
| Envoy Air | 79.8% | 62 min | 2.5% | 785 |
| United Airlines | 64.3% | 68 min | 1.5% | 584 |
| SkyWest Airlines | 63.0% | 76 min | 5.2% | 267 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to ROC
On-time arrival % by scheduled departure hour (local time), 4,176 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 2 | |
| 6am–7am | 85.0% | 1.6% | 62 |
| 7am–8am | 88.3% | 1.2% | 164 |
| 8am–9am | 84.3% | 1.0% | 623 |
| 9am–10am | 87.9% | 0.0% | 33 |
| 10am–11am | 84.0% | 1.1% | 281 |
| 11am–12pm | 88.5% | 1.4% | 220 |
| 12pm–1pm | Limited data | 29 | |
| 1pm–2pm | 75.1% | 1.5% | 455 |
| 2pm–3pm | 75.9% | 0.8% | 369 |
| 3pm–4pm | 75.3% | 2.5% | 367 |
| 4pm–5pm | 63.7% | 7.1% | 99 |
| 5pm–6pm | 59.5% | 6.7% | 45 |
| 6pm–7pm | 66.0% | 1.1% | 866 |
| 7pm–8pm | 79.7% | 3.0% | 132 |
| 8pm–9pm | 75.4% | 2.4% | 250 |
| 9pm–10pm | 71.4% | 5.1% | 177 |
| 11pm–12am | Limited data | 2 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ORD to ROC
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 57.9% | -19.6 pts | 7.3% | 82 |
| Christmas & New Year (Dec 20 - Jan 3) | 77.9% | +0.4 pts | 4.3% | 161 |
| Summer peak (Jun 15 - Aug 15) | 73.4% | -4.2 pts | 2.0% | 794 |
| All other days | 77.5% | — | 1.4% | 3,139 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).