Best Time to Fly SDF to ORD: On-Time Stats by Hour & Airline
Louisville Muhammad Ali International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
2,796 flights were scheduled from Louisville (SDF) to Chicago (ORD) in the last 12 months, and 79.6% of those that flew arrived on time, 2.0 points above the US average of 77.6%.
Republic Airways was the most punctual of the 3 airlines on the route at 83.2%, while SkyWest Airlines trailed at 69.7%.
September has been the best month (87% on time) and Friday the weakest day of the week (74%).
2.9% of flights were cancelled, versus 1.8% nationally.
SDF to ORD 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 |
|---|---|---|---|---|
| Republic Airways | 83.2% | 68 min | 2.7% | 1,794 |
| Envoy Air | 80.7% | 78 min | 1.2% | 333 |
| SkyWest Airlines | 69.7% | 86 min | 4.1% | 660 |
| American Airlines | Limited data | 3 | ||
| United Airlines | Limited data | 5 | ||
| PSA Airlines | Limited data | 1 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SDF to ORD
On-time arrival % by scheduled departure hour (local time), 5,104 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.0% | 1.5% | 202 |
| 6am–7am | 88.4% | 1.7% | 534 |
| 7am–8am | 83.6% | 1.3% | 818 |
| 8am–9am | 86.4% | 0.8% | 513 |
| 9am–10am | 86.5% | 1.4% | 346 |
| 10am–11am | 84.6% | 0.3% | 335 |
| 11am–12pm | 88.7% | 1.2% | 331 |
| 12pm–1pm | 70.9% | 2.6% | 113 |
| 1pm–2pm | 73.8% | 3.0% | 197 |
| 2pm–3pm | 75.1% | 1.5% | 598 |
| 3pm–4pm | Limited data | 18 | |
| 4pm–5pm | 89.8% | 0.0% | 49 |
| 5pm–6pm | 62.7% | 3.2% | 410 |
| 6pm–7pm | 61.5% | 5.9% | 337 |
| 7pm–8pm | 70.9% | 6.4% | 280 |
| 8pm–9pm | Limited data | 22 | |
| 10pm–11pm | 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 SDF to ORD
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) | 69.9% | -11.1 pts | 6.7% | 89 |
| Christmas & New Year (Dec 20 - Jan 3) | 74.4% | -6.6 pts | 0.6% | 173 |
| Summer peak (Jun 15 - Aug 15) | 77.8% | -3.2 pts | 2.4% | 951 |
| All other days | 81.0% | — | 2.0% | 3,891 |
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).