Best Time to Fly ORD to SDF: On-Time Stats by Hour & Airline
Chicago O'Hare International → Louisville Muhammad Ali International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.4% of Chicago (ORD) to Louisville (SDF) flights arrived on time (2,793 scheduled flights). That is 1.2 points below the national average of 77.6%.
Envoy Air was the most punctual of the 3 airlines on the route at 86.6%, while SkyWest Airlines trailed at 71.7%.
September has been the best month (87% on time) and Sunday the weakest day of the week (74%).
3.6% of flights were cancelled, versus 1.8% nationally.
ORD 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 |
|---|---|---|---|---|
| Envoy Air | 86.6% | 49 min | 1.2% | 332 |
| Republic Airways | 76.4% | 76 min | 4.1% | 1,791 |
| SkyWest Airlines | 71.7% | 63 min | 3.3% | 660 |
| American Airlines | Limited data | 4 | ||
| United Airlines | Limited data | 5 | ||
| PSA Airlines | Limited data | 1 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to SDF
On-time arrival % by scheduled departure hour (local time), 5,102 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 79.5% | 0.0% | 117 |
| 7am–8am | 90.2% | 1.3% | 310 |
| 8am–9am | 92.0% | 0.0% | 112 |
| 9am–10am | 80.2% | 3.3% | 120 |
| 10am–11am | 72.1% | 1.3% | 552 |
| 11am–12pm | 85.4% | 0.8% | 242 |
| 12pm–1pm | Limited data | 19 | |
| 1pm–2pm | 88.3% | 0.0% | 60 |
| 2pm–3pm | 73.6% | 1.7% | 587 |
| 3pm–4pm | 74.7% | 2.3% | 218 |
| 4pm–5pm | 78.0% | 4.6% | 259 |
| 5pm–6pm | 78.6% | 2.3% | 568 |
| 6pm–7pm | 80.6% | 4.0% | 553 |
| 7pm–8pm | 73.5% | 1.9% | 686 |
| 8pm–9pm | 71.8% | 3.2% | 529 |
| 9pm–10pm | 74.3% | 9.5% | 169 |
| 11pm–12am | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ORD 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) | 75.3% | -3.2 pts | 9.0% | 89 |
| Christmas & New Year (Dec 20 - Jan 3) | 69.2% | -9.3 pts | 0.6% | 173 |
| Summer peak (Jun 15 - Aug 15) | 73.9% | -4.6 pts | 2.9% | 952 |
| All other days | 78.5% | — | 2.3% | 3,888 |
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).