Historical on-time performance
Chicago to Louisville
271 miData through Dec 2025Source: US DOT · BTS
Flights on MDW–SDF arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.0%of scheduled flights
based on 1,001 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time78%Medianon timep9040 minCancel1.0%Flights1,001
Why flights run late
Delay causes
- Airline25%
- Weather3%
- Air traffic (NAS)10%
- Late aircraft62%
- 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 MDW → 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 64% to 89% on time.
- Middays89% on time · p90 15 min · 705 flights
- Mornings88% on time · p90 15 min · 650 flights
- Afternoons79% on time · p90 35 min · 661 flights
- Evenings72% on time · p90 50 min · 480 flights
- Overnights64% on time · p90 70 min · 607 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 84% on time.
- Tuesdays84% on time · p90 25 min · 463 flights
- Wednesdays81% on time · p90 30 min · 466 flights
- Mondays80% on time · p90 35 min · 476 flights
- Saturdays79% on time · p90 35 min · 313 flights
- Thursdays77% on time · p90 35 min · 475 flights
- Fridays76% on time · p90 40 min · 476 flights
- Sundays75% on time · p90 45 min · 434 flights
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