Historical on-time performance
Denver to Louisville
1,024 miData through Dec 2025Source: US DOT · BTS
Flights on DEN–SDF arrive on time 71% of the time over the last 12 months.
On-time rate71%arrived within 15 min
p90 delay60 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 1,016 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time77%Medianon timep9050 minCancel0.4%Flights668
- Southwest AirlinesOn-time58%Median5 minp9090 minCancel0.9%Flights348
Why flights run late
Delay causes
- Airline31%
- Weather2%
- Air traffic (NAS)12%
- Late aircraft55%
- 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 DEN → SDF
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 84% on time.
- Mornings84% on time · p90 25 min · 918 flights
- Middays74% on time · p90 30 min · 422 flights
- Afternoons67% on time · p90 40 min · 343 flights
- Evenings64% on time · p90 80 min · 1,510 flights
- Overnights50% on time · p90 105 min · 96 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 66% to 75% on time.
- Mondays75% on time · p90 45 min · 468 flights
- Saturdays74% on time · p90 50 min · 461 flights
- Tuesdays72% on time · p90 55 min · 462 flights
- Wednesdays70% on time · p90 60 min · 462 flights
- Sundays69% on time · p90 55 min · 501 flights
- Fridays68% on time · p90 65 min · 466 flights
- Thursdays66% on time · p90 65 min · 469 flights
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