Historical on-time performance
Washington to Louisville
Flights on IAD–SDF arrive on time 81% of the time over the last 12 months.
based on 175 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysOn-time81%Medianon timep9050 minCancel0.0%Flights175
Why flights run late
Delay causes
- Airline19%
- Weather10%
- Air traffic (NAS)13%
- Late aircraft58%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline11%
- Weather39%
- Air traffic (NAS)50%
- Security0%
Most cancellations here are attributed to Air traffic (NAS). Shares are among 18 cancellations with a reported cause (BTS reports causes from June 2003).
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 (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 85% to 89% on time.
- Mornings89% on time · p90 15 min · 394 flights
- Evenings85% on time · p90 25 min · 709 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 83% to 89% on time.
- Thursdays89% on time · p90 15 min · 176 flights · limited
- Wednesdays89% on time · p90 15 min · 167 flights · limited
- Fridays88% on time · p90 20 min · 176 flights · limited
- Tuesdays88% on time · p90 20 min · 166 flights · limited
- Sundays85% on time · p90 15 min · 183 flights · limited
- Saturdays85% on time · p90 35 min · 169 flights · limited
- Mondays83% on time · p90 20 min · 174 flights · limited
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