Best Time to Fly ATL to ROC: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → Frederick Douglass Grtr Rochester International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 77.4% of Atlanta (ATL) to Rochester (ROC) flights arrived on time (1,041 scheduled flights). That is in line with the national average of 77.6%.
Delta Air Lines was the only reporting airline with regular flights on this route.
September has been the best month (87% on time) and Sunday the weakest day of the week (67%).
2.3% of flights were cancelled, versus 1.8% nationally.
ATL 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 |
|---|---|---|---|---|
| Delta Air Lines | 77.4% | 54 min | 2.3% | 1,041 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to ROC
On-time arrival % by scheduled departure hour (local time), 2,076 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | Limited data | 3 | |
| 9am–10am | 81.5% | 1.2% | 564 |
| 10am–11am | 81.4% | 0.0% | 59 |
| 11am–12pm | 83.8% | 1.0% | 100 |
| 2pm–3pm | Limited data | 3 | |
| 3pm–4pm | 73.6% | 0.7% | 595 |
| 4pm–5pm | Limited data | 22 | |
| 7pm–8pm | Limited data | 16 | |
| 8pm–9pm | Limited data | 21 | |
| 9pm–10pm | 75.9% | 2.6% | 420 |
| 10pm–11pm | 68.8% | 3.7% | 273 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ATL 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% | -20.9 pts | 0.0% | 38 |
| Christmas & New Year (Dec 20 - Jan 3) | 65.8% | -13.0 pts | 3.7% | 82 |
| Summer peak (Jun 15 - Aug 15) | 68.6% | -10.2 pts | 3.8% | 365 |
| All other days | 78.8% | — | 1.1% | 1,591 |
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).