Atlanta (ATL) to Louisville (SDF): On-Time Performance
Data through July 2026
When you fly ATL to SDF matters as much as anything else about the booking: the route swung from 94% on-time in September 2025 to just 60% in July 2024. Across the full period the route averages 82% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 77%), which matters most in the rough months.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 1.5%
- Flights/day
- 7.4
- last 12 months
- Duration
- 1h 20m
- scheduled
- Distance
- 321 mi
Best airline from ATL to SDF
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 86% | 10 min | 1.6% | 258 |
| Delta Air Lines | 82% | 12 min | 1.5% | 5,443 |
Monthly on-time trend
Best time to fly from ATL to SDF
Aim for departures around 7 a.m. (91% on-time); avoid 9 p.m. departures (72%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 80% | 14 min |
| Tuesday | 85% | 12 min |
| Wednesdaybest | 86% | 8 min |
| Thursday | 85% | 9 min |
| Friday | 82% | 14 min |
| Saturday | 83% | 11 min |
| Sunday | 74% | 17 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft26%
- Airline operations50%
- National airspace system17%
- Weather7%
Frequently asked questions
- How often are flights from ATL to SDF delayed?
- 18% of ATL–SDF flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 12 minutes.
- Which airline is most reliable from ATL to SDF?
- Southwest Airlines has the best on-time record on this route at 86%, based on 258 flights. 2 airlines flew ATL–SDF frequently enough to compare in this period.
- What is the best time of day to fly from ATL to SDF?
- Departures around 7 a.m. have the best record (91% on-time), while departures around 9 p.m. have the worst (72%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ATL to SDF?
- The scheduled ATL–SDF flight time averages 1h 20m over 321 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are ATL to SDF flights cancelled?
- 1.5% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from ATL to SDF?
- July 2024 was the roughest month in this dataset, with only 60% of arrivals on time. The best was September 2025 at 94%. If your dates are flexible, that 34-point gap is worth planning around.
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Based on 5,751 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.