Historical on-time performance
Chicago to Louisville
286 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–SDF arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled2.0%of scheduled flights
based on 2,389 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysOn-time76%Medianon timep9055 minCancel2.4%Flights1,437
- SkyWest AirlinesOn-time72%Medianon timep9065 minCancel2.1%Flights429
- Envoy AirbestOn-time83%Medianon timep9025 minCancel0.8%Flights523
Why flights run late
Delay causes
- Airline26%
- Weather7%
- Air traffic (NAS)18%
- Late aircraft49%
- 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 ORD → 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 71% to 85% on time.
- Mornings85% on time · p90 25 min · 1,054 flights
- Middays83% on time · p90 35 min · 844 flights
- Evenings77% on time · p90 45 min · 2,046 flights
- Afternoons77% on time · p90 40 min · 1,498 flights
- Overnights71% on time · p90 60 min · 1,135 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 81% on time.
- Tuesdays81% on time · p90 35 min · 899 flights
- Wednesdays80% on time · p90 45 min · 917 flights
- Thursdays79% on time · p90 40 min · 970 flights
- Saturdays78% on time · p90 35 min · 887 flights
- Fridays78% on time · p90 40 min · 975 flights
- Mondays77% on time · p90 45 min · 974 flights
- Sundays73% on time · p90 60 min · 955 flights
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