Historical on-time performance
Louisville to Denver
1,024 miData through Dec 2025Source: US DOT · BTS
Flights on SDF–DEN arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.8%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
Too close to call — no single carrier is clearly more on-time here.
- Southwest AirlinesOn-time75%Medianon timep9045 minCancel0.6%Flights348
- United AirlinesOn-time80%Medianon timep9035 minCancel0.9%Flights668
Why flights run late
Delay causes
- Airline37%
- Weather5%
- Air traffic (NAS)34%
- Late aircraft24%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SDF → DEN
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 55% to 87% on time.
- Mornings87% on time · p90 15 min · 1,473 flights
- Middays85% on time · p90 20 min · 468 flights
- Afternoons77% on time · p90 55 min · 1,183 flights
- Evenings64% on time · p90 70 min · 89 flights · limited
- Overnights55% on time · p90 90 min · 75 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 87% on time.
- Tuesdays87% on time · p90 15 min · 462 flights
- Wednesdays83% on time · p90 25 min · 463 flights
- Thursdays83% on time · p90 35 min · 467 flights
- Mondays82% on time · p90 30 min · 467 flights
- Fridays81% on time · p90 35 min · 467 flights
- Saturdays80% on time · p90 40 min · 458 flights
- Sundays77% on time · p90 50 min · 504 flights
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