Historical on-time performance
Washington to Louisville
451 miData through Dec 2025Source: US DOT · BTS
Flights on IAD–SDF arrive on time 85% of the time over the last 12 months.
On-time rate85%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled1.0%of scheduled flights
based on 302 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysOn-time85%Medianon timep9020 minCancel1.0%Flights302
Why flights run late
Delay causes
- Airline32%
- Weather17%
- Air traffic (NAS)16%
- Late aircraft35%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly IAD → SDF
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 86% to 91% on time.
- Afternoons91% on time · p90 10 min · 79 flights · limited
- Mornings89% on time · p90 15 min · 386 flights
- Evenings86% on time · p90 20 min · 809 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 83% to 90% on time.
- Wednesdays90% on time · p90 10 min · 178 flights · limited
- Tuesdays89% on time · p90 15 min · 177 flights · limited
- Thursdays89% on time · p90 15 min · 185 flights · limited
- Fridays88% on time · p90 20 min · 185 flights · limited
- Sundays86% on time · p90 10 min · 191 flights · limited
- Saturdays84% on time · p90 35 min · 179 flights · limited
- Mondays83% on time · p90 25 min · 185 flights · limited
Advertisement
Keep exploring