Best Time to Fly ROC to ORD: On-Time Stats by Hour & Airline
Frederick Douglass Grtr Rochester International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 75.5% of Rochester (ROC) to Chicago (ORD) flights arrived on time (2,355 scheduled flights). That is 2.1 points below the national average of 77.6%.
Among 4 airlines, Republic Airways led with 82.1% on time and SkyWest Airlines was last with 63.1%.
Over 24 months, Tuesday was the most reliable day (79% on time) and December the worst month (70%).
The cancellation rate was 2.4% (US average 1.8%).
ROC to ORD 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 | 82.1% | 84 min | 2.5% | 715 |
| Envoy Air | 79.6% | 90 min | 2.3% | 785 |
| United Airlines | 67.7% | 79 min | 1.5% | 588 |
| SkyWest Airlines | 63.1% | 127 min | 4.5% | 267 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ROC to ORD
On-time arrival % by scheduled departure hour (local time), 4,310 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 93.3% | 0.9% | 106 |
| 6am–7am | 82.8% | 0.8% | 971 |
| 7am–8am | 85.7% | 0.7% | 281 |
| 8am–9am | 88.6% | 1.1% | 89 |
| 9am–10am | Limited data | 3 | |
| 10am–11am | 90.3% | 0.5% | 196 |
| 11am–12pm | 80.9% | 1.3% | 626 |
| 12pm–1pm | 83.9% | 3.3% | 122 |
| 1pm–2pm | 84.4% | 1.9% | 431 |
| 2pm–3pm | 70.3% | 3.0% | 66 |
| 3pm–4pm | 81.0% | 0.0% | 100 |
| 4pm–5pm | 74.0% | 0.0% | 100 |
| 5pm–6pm | 57.2% | 1.8% | 736 |
| 6pm–7pm | 60.2% | 4.0% | 297 |
| 7pm–8pm | 68.3% | 7.6% | 66 |
| 8pm–9pm | 61.3% | 7.8% | 116 |
| 9pm–10pm | Limited data | 4 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ROC to ORD
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) | 59.2% | -18.4 pts | 7.3% | 82 |
| Christmas & New Year (Dec 20 - Jan 3) | 70.8% | -6.9 pts | 3.8% | 160 |
| Summer peak (Jun 15 - Aug 15) | 74.8% | -2.9 pts | 2.1% | 803 |
| All other days | 77.6% | — | 1.4% | 3,265 |
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).