Louisville Muhammad Ali International (SDF) Delays and On-Time Departures
Louisville, KY · ranked 130th of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
81.8% of the 23,144 flights scheduled to depart Louisville (SDF) in the last 12 months left on time, 4.3 points above the US average of 77.4%.
That ranks 130th of 333 US airports tracked on this site, with 2.2% of departures cancelled.
Among airlines at Louisville (SDF), Delta Air Lines left on time most often (87.5%).
Over 24 months, Wednesday was the most reliable day (87% on time) and June the worst month (77%).
Best time of day to fly out of Louisville (SDF)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 92.6% | 2.0% | 1,516 |
| 6am–7am | 92.3% | 1.8% | 6,350 |
| 7am–8am | 91.4% | 1.3% | 4,779 |
| 8am–9am | 90.6% | 1.1% | 3,034 |
| 9am–10am | 90.5% | 1.6% | 1,458 |
| 10am–11am | 86.2% | 1.5% | 3,273 |
| 11am–12pm | 85.2% | 2.2% | 2,624 |
| 12pm–1pm | 82.1% | 1.7% | 3,200 |
| 1pm–2pm | 81.5% | 1.8% | 2,882 |
| 2pm–3pm | 79.3% | 2.0% | 2,526 |
| 3pm–4pm | 76.7% | 1.7% | 3,019 |
| 4pm–5pm | 73.4% | 2.5% | 2,719 |
| 5pm–6pm | 73.1% | 2.1% | 2,837 |
| 6pm–7pm | 69.6% | 2.3% | 2,830 |
| 7pm–8pm | 70.7% | 4.1% | 1,892 |
| 8pm–9pm | 65.2% | 4.1% | 1,401 |
| 9pm–10pm | 51.0% | 1.9% | 318 |
| 10pm–11pm | Limited data | 5 | |
Airlines at SDF ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| Delta Air Lines | 87.5% | 89.5% | 1.6% | 2,736 |
| Republic Airways | 87.4% | 84.8% | 2.8% | 5,785 |
| United Airlines | 84.6% | 83.6% | 0.9% | 749 |
| Southwest Airlines | 80.2% | 83.2% | 1.4% | 5,270 |
| Envoy Air | 79.9% | 76.2% | 1.5% | 1,003 |
| SkyWest Airlines | 78.5% | 76.7% | 2.3% | 1,950 |
| American Airlines | 77.7% | 77.8% | 2.7% | 2,551 |
| PSA Airlines | 77.2% | 77.7% | 3.8% | 1,965 |
| Spirit Airlines | 76.1% | 79.5% | 5.2% | 366 |
| Allegiant Air | 65.7% | 64.4% | 0.7% | 769 |
80%+ good 70–79.9% fair <70% poor
Best day to fly out of SDF
On-time departures by day, 24 months.
Best month to fly out of SDF
On-time departures by month, 24 months.
Holiday travel at Louisville (SDF)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 84.3% | +0.4 pts | 0.9% | 817 |
| Christmas & New Year (Dec 20 - Jan 3) | 76.7% | -7.1 pts | 1.3% | 1,554 |
| Summer peak (Jun 15 - Aug 15) | 78.0% | -5.9 pts | 2.6% | 8,450 |
| All other days | 83.9% | — | 1.9% | 35,842 |
Monthly on-time departure trend at SDF
On-time departure % each month, with the 12-month US average for reference.
Routes from Louisville (SDF)
Every route from SDF with its own page, by number of flights (last 12 months, on-time arrivals).
| To | On time | Cancelled | Flights |
|---|---|---|---|
| SDF → Chicago (ORD) | 79.6% | 2.9% | 2,796 |
| SDF → Atlanta (ATL) | 89.8% | 1.6% | 2,717 |
| SDF → Dallas/Fort Worth (DFW) | 74.8% | 3.5% | 2,002 |
| SDF → Charlotte (CLT) | 82.5% | 2.1% | 1,757 |
| SDF → Detroit (DTW) | 82.9% | 0.9% | 1,128 |
| SDF → Denver (DEN) | 83.5% | 1.0% | 1,097 |
| SDF → New York (LGA) | 83.6% | 4.2% | 1,037 |
| SDF → Washington (DCA) | 78.9% | 4.2% | 1,029 |
| SDF → Newark (EWR) | 86.9% | 4.3% | 992 |
| SDF → Chicago (MDW) | 85.0% | 1.7% | 977 |
| SDF → Baltimore (BWI) | 86.8% | 1.9% | 891 |
| SDF → Orlando (MCO) | 81.0% | 1.9% | 856 |
| SDF → Boston (BOS) | 71.5% | 2.1% | 708 |
| SDF → Philadelphia (PHL) | 84.9% | 2.0% | 608 |
| SDF → Minneapolis (MSP) | 81.6% | 1.1% | 527 |
| SDF → Nashville (BNA) | 78.8% | 1.0% | 505 |
| SDF → Miami (MIA) | 82.4% | 1.6% | 429 |
| SDF → Tampa (TPA) | 82.8% | 2.0% | 406 |
| SDF → Las Vegas (LAS) | 85.0% | 0.8% | 399 |
| SDF → Phoenix (PHX) | 82.5% | 1.1% | 372 |
| SDF → Dallas (DAL) | 83.9% | 0.6% | 350 |
| SDF → Fort Lauderdale (FLL) | 63.1% | 4.7% | 296 |
| SDF → Houston (HOU) | 80.8% | 0.7% | 283 |
| SDF → Washington (IAD) | 93.2% | 0.4% | 236 |
| SDF → Punta Gorda (PGD) | 74.5% | 1.3% | 155 |