Best Time to Fly SDF to BOS: On-Time Stats by Hour & Airline
Louisville Muhammad Ali International → Logan International
Data through July 2026 · Last updated October 18, 2026
708 flights were scheduled from Louisville (SDF) to Boston (BOS) in the last 12 months, and 71.5% of those that flew arrived on time, 6.1 points below the US average of 77.6%.
Republic Airways was the most punctual of the 2 airlines on the route at 77.0%, while Envoy Air trailed at 60.3%.
December has been the best month (85% on time) and Sunday the weakest day of the week (68%).
2.1% of flights were cancelled, versus 1.8% nationally.
SDF to BOS 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 | 77.0% | 75 min | 2.7% | 484 |
| Envoy Air | 60.3% | 60 min | 0.9% | 222 |
| Delta Air Lines | Limited data | 2 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SDF to BOS
On-time arrival % by scheduled departure hour (local time), 1,389 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | Limited data | 16 | |
| 9am–10am | Limited data | 13 | |
| 10am–11am | 90.9% | 3.8% | 80 |
| 11am–12pm | Limited data | 15 | |
| 12pm–1pm | 79.2% | 2.5% | 242 |
| 1pm–2pm | 67.8% | 0.4% | 229 |
| 2pm–3pm | 76.1% | 0.0% | 142 |
| 3pm–4pm | 57.9% | 1.7% | 58 |
| 4pm–5pm | 68.7% | 1.4% | 487 |
| 5pm–6pm | 64.5% | 2.1% | 96 |
| 6pm–7pm | Limited data | 8 | |
| 7pm–8pm | Limited data | 3 | |
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 BOS
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) | 86.4% | +13.0 pts | 2.2% | 45 |
| Summer peak (Jun 15 - Aug 15) | 66.0% | -7.3 pts | 2.0% | 246 |
| All other days | 73.3% | — | 1.4% | 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).