Route
BOS → SDF
Boston Logan International Airport Louisville Muhammad Ali International Airport
829 miles
Return route SDF → BOS →
How punctual is this route?
- On-time arrivals
- 84.9%
- Less than 15 minutes late
- Cancelled
- 1.7%
- Of scheduled flights
- Average delay when late
- 58 min
- Flights arriving 15+ minutes late
- Flights tracked
- 709
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 39%
- Airline (crew, maintenance, cleaning) 34%
- Air traffic control & airport 26%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 90.0% | 60 |
| October 2025 | 85.2% | 61 |
| November 2025 | 91.5% | 59 |
| December 2025 | 73.2% | 58 |
| January 2026 | 76.1% | 51 |
| February 2026 | 80.0% | 49 |
| March 2026 | 90.2% | 61 |
| April 2026 | 90.3% | 62 |
| May 2026 | 87.5% | 64 |
| June 2026 | 85.0% | 60 |
| July 2026 | 80.3% | 62 |
| August 2026 | 85.2% | 62 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Republic Airways | 485 | 84.4% | 2.1% | 55 min |
| Envoy Air | 222 | 86.8% | 0.9% | 70 min |
| Delta Air Lines | 2 | 0.0% | 0.0% | 25 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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