Louisville (SDF) to Denver (DEN): On-Time Performance
Data through May 2026
Louisville (SDF) to Denver (DEN) effectively runs on two schedules. In October 2024, 95% of arrivals were on time; in January 2025 that fell to 65% — a 30-point seasonal swing. Across the full period the route averages 83% on-time against a national 78%. Morning departures also hold up better than evening ones (90% vs 57%), which matters most in the rough months.
- On-time
- 83%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 3.0
- last 12 months
- Duration
- 3h 2m
- scheduled
- Distance
- 1,024 mi
Best airline from SDF to DEN
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 84% | 13 min | 1.1% | 1,399 |
| Southwest Airlines | 81% | 12 min | 0.7% | 752 |
Monthly on-time trend
Best time to fly from SDF to DEN
Aim for departures around 5 a.m. (97% on-time); avoid 8 p.m. departures (44%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 84% | 11 min |
| Tuesdaybest | 88% | 11 min |
| Wednesday | 87% | 7 min |
| Thursday | 82% | 15 min |
| Friday | 80% | 14 min |
| Saturday | 83% | 11 min |
| Sunday | 78% | 20 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft24%
- Airline operations43%
- National airspace system30%
- Weather3%
Frequently asked questions
- How often are flights from SDF to DEN delayed?
- 17% of SDF–DEN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 13 minutes.
- Which airline is most reliable from SDF to DEN?
- United Airlines has the best on-time record on this route at 84%, based on 1,399 flights. 2 airlines flew SDF–DEN frequently enough to compare in this period.
- What is the best time of day to fly from SDF to DEN?
- Departures around 5 a.m. have the best record (97% on-time), while departures around 8 p.m. have the worst (44%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SDF to DEN?
- The scheduled SDF–DEN flight time averages 3h 2m over 1,024 miles. Actual arrival times vary — flights on this route land 15+ minutes late 17% of the time.
- How often are SDF to DEN flights cancelled?
- 0.9% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from SDF to DEN?
- January 2025 was the roughest month in this dataset, with only 65% of arrivals on time. The best was October 2024 at 95%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 2,151 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.