Best Time to Fly RST to ORD: On-Time Stats by Hour & Airline
Rochester International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 66.8% of Rochester (RST) to Chicago (ORD) flights arrived on time (1,057 scheduled flights). That is 10.8 points below the national average of 77.6%.
Envoy Air was the most punctual of the 2 airlines on the route at 74.0%, while SkyWest Airlines trailed at 58.1%.
September has been the best month (86% on time) and Friday the weakest day of the week (62%).
4.7% of flights were cancelled, versus 1.8% nationally.
RST 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 |
|---|---|---|---|---|
| Envoy Air | 74.0% | 70 min | 4.7% | 578 |
| SkyWest Airlines | 58.1% | 119 min | 4.8% | 479 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly RST to ORD
On-time arrival % by scheduled departure hour (local time), 1,626 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 79.0% | 4.7% | 170 |
| 6am–7am | 78.4% | 2.9% | 376 |
| 7am–8am | Limited data | 19 | |
| 10am–11am | 74.7% | 1.4% | 72 |
| 11am–12pm | 69.3% | 2.7% | 225 |
| 12pm–1pm | 69.3% | 0.0% | 127 |
| 1pm–2pm | 53.1% | 0.0% | 32 |
| 2pm–3pm | 52.1% | 0.0% | 48 |
| 3pm–4pm | 70.7% | 0.0% | 58 |
| 4pm–5pm | 76.9% | 1.5% | 67 |
| 5pm–6pm | 36.7% | 7.5% | 53 |
| 6pm–7pm | 54.4% | 6.2% | 339 |
| 7pm–8pm | 67.6% | 7.5% | 40 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on RST 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) | Limited data | 20 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 64.9% | -6.0 pts | 11.9% | 42 |
| Summer peak (Jun 15 - Aug 15) | 60.9% | -10.0 pts | 3.0% | 337 |
| All other days | 70.9% | — | 2.9% | 1,227 |
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).