Best Time to Fly ATL to BUF: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → Buffalo Niagara International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 77.2% of Atlanta (ATL) to Buffalo (BUF) flights arrived on time (1,521 scheduled flights). That is in line with the national average of 77.6%.
Delta Air Lines was the most punctual of the 2 airlines on the route at 79.7%, while Frontier Airlines trailed at 66.0%.
November has been the best month (88% on time) and Sunday the weakest day of the week (71%).
2.0% of flights were cancelled, versus 1.8% nationally.
ATL to BUF 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 | 79.7% | 53 min | 1.8% | 1,250 |
| Frontier Airlines | 66.0% | 83 min | 3.0% | 270 |
| Southwest Airlines | Limited data | 1 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to BUF
On-time arrival % by scheduled departure hour (local time), 2,894 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | Limited data | 9 | |
| 7am–8am | Limited data | 10 | |
| 8am–9am | 80.9% | 1.4% | 69 |
| 9am–10am | 85.3% | 1.7% | 776 |
| 10am–11am | 64.0% | 3.4% | 89 |
| 11am–12pm | 72.2% | 5.0% | 121 |
| 12pm–1pm | 78.1% | 0.0% | 96 |
| 1pm–2pm | 78.7% | 0.5% | 217 |
| 2pm–3pm | 77.2% | 1.9% | 161 |
| 3pm–4pm | 76.6% | 1.8% | 335 |
| 4pm–5pm | 68.0% | 1.2% | 259 |
| 5pm–6pm | Limited data | 5 | |
| 6pm–7pm | Limited data | 9 | |
| 7pm–8pm | Limited data | 19 | |
| 8pm–9pm | Limited data | 4 | |
| 9pm–10pm | 75.0% | 1.6% | 670 |
| 10pm–11pm | 77.8% | 0.0% | 45 |
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 BUF
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) | 82.3% | +2.4 pts | 0.0% | 51 |
| Christmas & New Year (Dec 20 - Jan 3) | 68.1% | -11.8 pts | 6.2% | 97 |
| Summer peak (Jun 15 - Aug 15) | 68.3% | -11.6 pts | 2.9% | 556 |
| All other days | 79.9% | — | 1.1% | 2,190 |
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).