Historical on-time performance
Louisville to Washington
451 miData through Dec 2025Source: US DOT · BTS
Flights on SDF–IAD arrive on time 93% of the time over the last 12 months.
On-time rate93%arrived within 15 min
p90 delay10 min1 in 10 flights is worse (tail risk)
Cancelled1.5%of scheduled flights
based on 274 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysOn-time93%Medianon timep9010 minCancel1.5%Flights274
Why flights run late
Delay causes
- Airline42%
- Weather3%
- Air traffic (NAS)16%
- Late aircraft40%
- 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 SDF → IAD
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 92% to 94% on time.
- Mornings94% on time · p90 5 min · 851 flights
- Afternoons93% on time · p90 5 min · 55 flights · limited
- Middays92% on time · p90 10 min · 371 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 87% to 96% on time.
- Tuesdays96% on time · p90 5 min · 176 flights · limited
- Fridays95% on time · p90 5 min · 183 flights · limited
- Wednesdays95% on time · p90 5 min · 178 flights · limited
- Mondays94% on time · p90 on time · 185 flights · limited
- Saturdays93% on time · p90 5 min · 178 flights · limited
- Thursdays92% on time · p90 10 min · 188 flights · limited
- Sundays87% on time · p90 15 min · 190 flights · limited
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