Best Time to Fly BOS to SDF: On-Time Stats by Hour & Airline
Logan International → Louisville Muhammad Ali International
Data through July 2026 · Last updated October 18, 2026
708 flights were scheduled from Boston (BOS) to Louisville (SDF) in the last 12 months, and 85.1% of those that flew arrived on time, 7.4 points above the US average of 77.6%.
Envoy Air was the most punctual of the 2 airlines on the route at 88.2%, while Republic Airways trailed at 84.0%.
September has been the best month (94% on time) and Thursday the weakest day of the week (84%).
1.6% of flights were cancelled, versus 1.8% nationally.
BOS 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 | 88.2% | 72 min | 0.9% | 222 |
| Republic Airways | 84.0% | 48 min | 1.9% | 484 |
| Delta Air Lines | Limited data | 2 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BOS to SDF
On-time arrival % by scheduled departure hour (local time), 1,389 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | Limited data | 2 | |
| 7am–8am | 88.2% | 5.0% | 80 |
| 8am–9am | Limited data | 18 | |
| 9am–10am | 89.8% | 1.6% | 311 |
| 10am–11am | 89.9% | 1.0% | 290 |
| 11am–12pm | 89.6% | 0.0% | 48 |
| 12pm–1pm | 83.0% | 0.6% | 173 |
| 1pm–2pm | 86.3% | 0.3% | 366 |
| 2pm–3pm | 85.7% | 0.0% | 49 |
| 3pm–4pm | Limited data | 24 | |
| 4pm–5pm | Limited data | 16 | |
| 5pm–6pm | Limited data | 12 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BOS 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) | Limited data | 25 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 77.3% | -11.4 pts | 0.0% | 45 |
| Summer peak (Jun 15 - Aug 15) | 83.1% | -5.6 pts | 0.8% | 246 |
| All other days | 88.7% | — | 1.1% | 1,073 |
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).