Historical on-time performance
Boston to Louisville
829 miData through Dec 2025Source: US DOT · BTS
Flights on BOS–SDF arrive on time 85% of the time over the last 12 months.
On-time rate85%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 632 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Envoy AirOn-time93%Medianon timep9010 minCancel0.0%Flights30
- Republic AirwaysOn-time84%Medianon timep9030 minCancel0.7%Flights602
Why flights run late
Delay causes
- Airline43%
- Weather2%
- Air traffic (NAS)17%
- Late aircraft38%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly BOS → SDF
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 93% on time.
- Mornings93% on time · p90 5 min · 298 flights
- Middays89% on time · p90 15 min · 1,138 flights
- Afternoons85% on time · p90 20 min · 494 flights
- Evenings75% on time · p90 70 min · 60 flights · limited
- Overnights69% on time · p90 70 min · 146 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 83% to 89% on time.
- Tuesdays89% on time · p90 10 min · 318 flights
- Wednesdays89% on time · p90 15 min · 317 flights
- Fridays88% on time · p90 25 min · 315 flights
- Thursdays87% on time · p90 20 min · 318 flights
- Saturdays87% on time · p90 15 min · 232 flights
- Mondays85% on time · p90 15 min · 321 flights
- Sundays83% on time · p90 35 min · 315 flights
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