Historical on-time performance
Louisville to Boston
829 miData through Dec 2025Source: US DOT · BTS
Flights on SDF–BOS arrive on time 68% of the time over the last 12 months.
On-time rate68%arrived within 15 min
p90 delay80 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights
based on 633 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysbestOn-time70%Medianon timep9080 minCancel1.2%Flights603
- Envoy AirOn-time37%Median25 minp90100 minCancel0.0%Flights30
Why flights run late
Delay causes
- Airline12%
- Weather13%
- Air traffic (NAS)54%
- Late aircraft20%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SDF → BOS
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 — 89% on time.
- Mornings89% on time · p90 10 min · 235 flights
- Evenings75% on time · p90 45 min · 480 flights
- Middays75% on time · p90 55 min · 392 flights
- Afternoons72% on time · p90 70 min · 1,029 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 68% to 83% on time.
- Saturdays83% on time · p90 35 min · 227 flights
- Tuesdays79% on time · p90 60 min · 317 flights
- Wednesdays77% on time · p90 45 min · 317 flights
- Thursdays74% on time · p90 55 min · 317 flights
- Mondays74% on time · p90 60 min · 321 flights
- Fridays73% on time · p90 70 min · 315 flights
- Sundays68% on time · p90 70 min · 322 flights
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