Louisville (SDF) to Atlanta (ATL): On-Time Performance
Data through May 2026
The calendar drives reliability on SDF–ATL. September 2025 flights landed on schedule 99% of the time, but July 2024 dropped to 78% — a gap of 21 points. Across the full period the route averages 88% on-time against a national 78%. Morning departures also hold up better than evening ones (91% vs 81%), which matters most in the rough months.
- On-time
- 88%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 1.6%
- Flights/day
- 7.4
- last 12 months
- Duration
- 1h 29m
- scheduled
- Distance
- 321 mi
Best airline from SDF to ATL
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 91% | 5 min | 1.0% | 290 |
| Delta Air Lines | 88% | 11 min | 1.6% | 5,176 |
Monthly on-time trend
Best time to fly from SDF to ATL
Aim for departures around 11 a.m. (94% on-time); avoid 8 p.m. departures (78%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 87% | 14 min |
| Tuesday | 89% | 10 min |
| Wednesday | 90% | 7 min |
| Thursdaybest | 92% | 8 min |
| Friday | 88% | 12 min |
| Saturday | 88% | 10 min |
| Sunday | 84% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft34%
- Airline operations43%
- National airspace system19%
- Weather5%
Frequently asked questions
- How often are flights from SDF to ATL delayed?
- 12% of SDF–ATL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 11 minutes.
- Which airline is most reliable from SDF to ATL?
- Southwest Airlines has the best on-time record on this route at 91%, based on 290 flights. 2 airlines flew SDF–ATL frequently enough to compare in this period.
- What is the best time of day to fly from SDF to ATL?
- Departures around 11 a.m. have the best record (94% on-time), while departures around 8 p.m. have the worst (78%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SDF to ATL?
- The scheduled SDF–ATL flight time averages 1h 29m over 321 miles. Actual arrival times vary — flights on this route land 15+ minutes late 12% of the time.
- How often are SDF to ATL flights cancelled?
- 1.6% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from SDF to ATL?
- July 2024 was the roughest month in this dataset, with only 78% of arrivals on time. The best was September 2025 at 99%. If your dates are flexible, that 21-point gap is worth planning around.
Explore related pages
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Based on 5,516 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.