Historical on-time performance
Louisville to Chicago
286 miData through May 2026Source: US DOT · BTS
Flights on SDF–ORD arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled2.4%of scheduled flights
based on 2,688 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysbestOn-time80%Medianon timep9030 minCancel2.5%Flights1,712
- Envoy AirOn-time76%Medianon timep9055 minCancel1.3%Flights462
- SkyWest AirlinesOn-time68%Medianon timep9075 minCancel2.9%Flights514
Why flights run late
Delay causes
- Airline19%
- Weather7%
- Air traffic (NAS)38%
- Late aircraft36%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline3%
- Weather70%
- Air traffic (NAS)27%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 64 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 SDF → ORD
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 85% on time.
- Mornings85% on time · p90 20 min · 3,311 flights
- Middays82% on time · p90 35 min · 1,414 flights
- Afternoons79% on time · p90 50 min · 807 flights
- Evenings64% on time · p90 65 min · 1,491 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 81% on time.
- Thursdays81% on time · p90 25 min · 1,044 flights
- Mondays81% on time · p90 25 min · 1,039 flights
- Wednesdays81% on time · p90 35 min · 990 flights
- Tuesdays81% on time · p90 35 min · 967 flights
- Saturdays78% on time · p90 35 min · 953 flights
- Sundays76% on time · p90 55 min · 1,010 flights
- Fridays76% on time · p90 45 min · 1,043 flights
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