Best Time to Fly ATL to SDF: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → Louisville Muhammad Ali International
Data through July 2026 · Last updated October 18, 2026
2,717 flights were scheduled from Atlanta (ATL) to Louisville (SDF) in the last 12 months, and 84.4% of those that flew arrived on time, 6.7 points above the US average of 77.6%.
Delta Air Lines was the only reporting airline with regular flights on this route.
Over 24 months, Wednesday was the most reliable day (87% on time) and July the worst month (76%).
The cancellation rate was 1.5% (US average 1.8%).
ATL to SDF 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 | 84.4% | 64 min | 1.5% | 2,717 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to SDF
On-time arrival % by scheduled departure hour (local time), 5,499 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 91.9% | 3.9% | 129 |
| 8am–9am | 89.7% | 1.2% | 651 |
| 9am–10am | 90.8% | 1.1% | 175 |
| 10am–11am | 88.8% | 1.3% | 637 |
| 11am–12pm | 82.5% | 0.0% | 57 |
| 12pm–1pm | 87.0% | 1.5% | 265 |
| 1pm–2pm | 85.0% | 0.3% | 380 |
| 2pm–3pm | 80.3% | 2.0% | 202 |
| 3pm–4pm | 80.9% | 1.0% | 495 |
| 4pm–5pm | 81.0% | 0.9% | 213 |
| 5pm–6pm | 78.5% | 0.4% | 452 |
| 6pm–7pm | 82.0% | 2.2% | 92 |
| 7pm–8pm | 78.1% | 0.8% | 396 |
| 8pm–9pm | 79.7% | 1.7% | 296 |
| 9pm–10pm | 74.4% | 0.9% | 317 |
| 10pm–11pm | 82.3% | 1.6% | 614 |
| 11pm–12am | 72.8% | 2.3% | 128 |
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 SDF
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) | 79.0% | -5.5 pts | 0.0% | 105 |
| Christmas & New Year (Dec 20 - Jan 3) | 81.8% | -2.8 pts | 2.6% | 192 |
| Summer peak (Jun 15 - Aug 15) | 77.6% | -7.0 pts | 1.0% | 959 |
| All other days | 84.6% | — | 1.2% | 4,243 |
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).