BOS to SDF flight delays & on-time performance
Nonstop flights from Boston Logan International Airport to Louisville Muhammad Ali International Airport · 829 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BOS or SDF right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Boston (BOS) to Louisville (SDF) arrived on time 85% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.6% were cancelled, and 4% arrived an hour or more late.
- Envoy Air was the most punctual airline here (88% on time); Republic Airways was the least (84%).
- Departures scheduled around 10am did best (89% on time); around 1pm did worst (80%).
- Wednesday was the most reliable day to fly (90% on time) and Friday the least (82%).
- The largest source of delay minutes was late-arriving aircraft (43%).
Which airline is most on time from BOS to SDF?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Envoy AirRegional airline operating American Eagle flights. | 88% | 0.9% | 10 min | 4.1% | 222 |
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 84% | 1.9% | 8 min | 4.4% | 484 |
| Delta Air Lines | 0% | 0.0% | 25 min | 0.0% | 2 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am88%78 flights
- 8am100%12 flights
- 9am85%180 flights
- 10am89%171 flights
- 11am88%25 flights
- 12pm83%71 flights
- 1pm80%94 flights
- 2pm86%44 flights
- 3pm78%18 flights
- 5pm58%12 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday90%4.8% cancelled
- Tuesday83%3.8% cancelled
- Wednesday90%0.0% cancelled
- Thursday84%0.0% cancelled
- Friday82%0.0% cancelled
- Saturday84%1.1% cancelled
- Sunday82%1.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft43%
- Airline (crew, maintenance, cleaning, fueling)36%
- Air traffic control & airport congestion19%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather64%
- Airline (crew, maintenance, cleaning, fueling)18%
- Air traffic control & airport congestion18%
- Security0%
BOS to SDF: common questions
- How often are BOS to SDF flights on time?
- 85% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Boston to Louisville cancelled?
- 1.6% of scheduled flights were cancelled (11 of 708).
- How long are typical delays?
- Across all flights the average arrival delay was 9 min (early arrivals count as zero). Flights that were late arrived 54 min behind schedule on average, and 4.3% of flights were an hour or more late.
- How long is taxi time at BOS?
- Flights on this route spent 21 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SDF to BOS — 71% on time
More flights from Boston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BOS → SDF, nonstop flights by US airlines that report to the DOT. How we calculate this.