Historical on-time performance
Louisville to Denver
1,024 miData through May 2026Source: US DOT · BTS
Flights on SDF–DEN arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights
based on 1,079 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time84%Medianon timep9025 minCancel1.1%Flights731
- Southwest AirlinesOn-time78%Medianon timep9040 minCancel1.1%Flights348
Why flights run late
Delay causes
- Airline42%
- Weather3%
- Air traffic (NAS)31%
- Late aircraft24%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline42%
- Weather42%
- Air traffic (NAS)17%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 12 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 SDF → DEN
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 — 88% on time.
- Mornings88% on time · p90 15 min · 1,493 flights
- Middays84% on time · p90 20 min · 422 flights
- Afternoons77% on time · p90 55 min · 1,196 flights
- Evenings65% on time · p90 60 min · 105 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 · 456 flights
- Wednesdays86% on time · p90 15 min · 456 flights
- Mondays83% on time · p90 30 min · 461 flights
- Thursdays82% on time · p90 40 min · 467 flights
- Saturdays81% on time · p90 35 min · 470 flights
- Fridays81% on time · p90 35 min · 465 flights
- Sundays77% on time · p90 40 min · 504 flights
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