Historical on-time performance
Denver to Louisville
1,024 miData through May 2026Source: US DOT · BTS
Flights on DEN–SDF arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 1,078 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time79%Medianon timep9040 minCancel0.5%Flights731
- Southwest AirlinesOn-time63%Median5 minp9070 minCancel1.2%Flights347
Why flights run late
Delay causes
- Airline29%
- Weather2%
- Air traffic (NAS)13%
- Late aircraft56%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline25%
- Weather63%
- Air traffic (NAS)13%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 8 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 DEN → SDF
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 · 1,028 flights
- Middays75% on time · p90 30 min · 370 flights
- Afternoons71% on time · p90 35 min · 318 flights
- Evenings65% on time · p90 75 min · 1,466 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 67% to 77% on time.
- Saturdays77% on time · p90 45 min · 472 flights
- Mondays75% on time · p90 40 min · 462 flights
- Tuesdays74% on time · p90 55 min · 456 flights
- Wednesdays74% on time · p90 45 min · 455 flights
- Fridays71% on time · p90 55 min · 465 flights
- Sundays71% on time · p90 55 min · 501 flights
- Thursdays67% on time · p90 65 min · 468 flights
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