Route · SDF → DEN · 2020–2025 BTS data
Louisville to Denver
The SDF–DEN corridor (Louisville, KY → Denver, CO) runs ahead of the national average, served by 20 carriers across roughly 1,024 miles.
Data updated 2026-06-13
- 83.6%
- On-time
- +4.6 pts
- vs US avg
- 75 min
- Delay when late
- 5,950
- Flights
Cancelled
0.7%
Best Month
Dec 2024 95%
Worst Month
Jan 2025 67%
Distance
1,024 mi
Carriers
20
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 93 | 28 | 0 | 1 | WN,UA |
| Nov 2025 | 89 | 7 | 2 | 0 | UA,WN |
| Oct 2025 | 93 | 14 | 0 | 0 | UA,WN |
| Sep 2025 | 90 | 7 | 0 | 0 | UA,WN |
| Aug 2025 | 94 | 20 | 0 | 0 | WN,UA |
| Jul 2025 | 97 | 18 | 0 | 0 | UA,WN |
| Jun 2025 | 94 | 25 | 2 | 0 | UA,WN |
| May 2025 | 98 | 20 | 1 | 1 | UA,WN |
| Apr 2025 | 90 | 23 | 0 | 2 | UA,WN |
| Mar 2025 | 62 | 6 | 0 | 0 | UA,WN |
| Feb 2025 | 62 | 16 | 0 | 0 | UA,WN |
| Jan 2025 | 82 | 27 | 3 | 1 | UA,WN |
| Dec 2024 | 93 | 5 | 0 | 0 | UA,WN |
| Nov 2024 | 89 | 16 | 0 | 0 | UA,WN |
| Oct 2024 | 93 | 5 | 0 | 0 | UA,WN |
| Sep 2024 | 90 | 10 | 1 | 0 | WN,UA |
| Aug 2024 | 94 | 11 | 1 | 0 | WN,UA |
| Jul 2024 | 97 | 17 | 2 | 1 | UA,WN |
| Jun 2024 | 94 | 15 | 0 | 0 | UA,WN |
| May 2024 | 96 | 24 | 1 | 0 | UA,WN |
| Apr 2024 | 90 | 12 | 0 | 0 | OO,UA,WN |
| Mar 2024 | 93 | 9 | 1 | 0 | UA,WN |
| Feb 2024 | 87 | 11 | 1 | 0 | UA,WN |
| Jan 2024 | 93 | 12 | 0 | 0 | WN,OO,UA |
Cancellation Rate
0.7%
15 of 2,153 flights
Diversion Rate
0.3%
6 of 2,153 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SDF - Louisville
Full on-time, delay-cause, and seasonal performance for Louisville, KY.
Origin airport →DEN - Denver
Full on-time, delay-cause, and seasonal performance for Denver, CO.
Destination airport →Compare the two airports
See SDF and DEN side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to SDF–DEN.
Routes with a similar on-time rate
What the Data Says About SDF to DEN
Bureau of Transportation Statistics records show Louisville to Denver (SDF to DEN) running a 83.6% on-time rate over 5,950 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 74.8 minutes. The 1,024-mile corridor is served by 20 carriers, and over the last 24 months 0.7% of 2,153 flights were cancelled, 0.3% diverted.
The monthly split is wide on this route: Dec 2024 posted the strongest performance at 95% on-time, while Jan 2025 came in at just 67% - a 28-point swing worth factoring into travel timing.
Frequently Asked Questions
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.