SDF to BOS flight delays & on-time performance
Nonstop flights from Louisville Muhammad Ali International Airport to Boston Logan International Airport · 829 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SDF or BOS right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Louisville (SDF) to Boston (BOS) arrived on time 71% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2.1% were cancelled, and 12% arrived an hour or more late.
- Republic Airways was the most punctual airline here (77% on time); Envoy Air was the least (60%).
- Departures scheduled around 10am did best (92% on time); around 5pm did worst (62%).
- Saturday was the most reliable day to fly (84% on time) and Sunday the least (65%).
- The largest source of delay minutes was air traffic control & airport congestion (64%).
Which airline is most on time from SDF to BOS?
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 |
|---|---|---|---|---|---|
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 77% | 2.7% | 18 min | 10.2% | 484 |
| Envoy AirRegional airline operating American Eagle flights. | 60% | 0.9% | 24 min | 16.4% | 222 |
| Delta Air Lines | 0% | 0.0% | 43 min | 50.0% | 2 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 8am100%16 flights
- 10am92%78 flights
- 11am92%13 flights
- 12pm75%110 flights
- 1pm65%186 flights
- 2pm72%39 flights
- 3pm77%23 flights
- 4pm65%170 flights
- 5pm62%63 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday76%4.8% cancelled
- Tuesday66%3.8% cancelled
- Wednesday67%1.0% cancelled
- Thursday73%1.0% cancelled
- Friday71%0.0% cancelled
- Saturday84%1.1% cancelled
- Sunday65%2.9% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Air traffic control & airport congestion64%
- Late-arriving aircraft21%
- Airline (crew, maintenance, cleaning, fueling)13%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Air traffic control & airport congestion47%
- Extreme weather33%
- Airline (crew, maintenance, cleaning, fueling)20%
- Security0%
SDF to BOS: common questions
- How often are SDF to BOS flights on time?
- 71% 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 Louisville to Boston cancelled?
- 2.1% of scheduled flights were cancelled (15 of 708).
- How long are typical delays?
- Across all flights the average arrival delay was 20 min (early arrivals count as zero). Flights that were late arrived 68 min behind schedule on average, and 12.3% of flights were an hour or more late.
- How long is taxi time at SDF?
- Flights on this route spent 19 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BOS to SDF — 85% on time
More flights from Louisville
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SDF → BOS, nonstop flights by US airlines that report to the DOT. How we calculate this.