OnTimeStats

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 Airlinesbest
    On-time77%
    Medianon time
    p9050 min
    Cancel0.4%
    Flights668
  • Southwest Airlines
    On-time58%
    Median5 min
    p9090 min
    Cancel0.9%
    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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Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.