Route · DEN → SDF · 2020–2025 BTS data
Denver to Louisville
The DEN–SDF corridor (Denver, CO → Louisville, KY) runs behind the national average, served by 19 carriers across roughly 1,024 miles.
Data updated 2026-06-13
- 72.9%
- On-time
- -6.1 pts
- vs US avg
- 65 min
- Delay when late
- 5,952
- Flights
Cancelled
0.6%
Best Month
Oct 2024 89%
Worst Month
Jul 2025 53%
Distance
1,024 mi
Carriers
19
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 93 | 23 | 0 | 0 | WN,UA |
| Nov 2025 | 89 | 17 | 2 | 0 | UA,WN |
| Oct 2025 | 93 | 17 | 0 | 0 | UA,WN |
| Sep 2025 | 90 | 23 | 0 | 0 | UA,WN |
| Aug 2025 | 94 | 29 | 0 | 0 | WN,UA |
| Jul 2025 | 97 | 46 | 1 | 0 | UA,WN |
| Jun 2025 | 94 | 38 | 0 | 0 | UA,WN |
| May 2025 | 98 | 28 | 0 | 1 | UA,WN |
| Apr 2025 | 90 | 23 | 0 | 1 | UA,WN |
| Mar 2025 | 62 | 21 | 0 | 1 | UA,WN |
| Feb 2025 | 62 | 16 | 0 | 0 | UA,WN |
| Jan 2025 | 82 | 16 | 3 | 0 | UA,WN |
| Dec 2024 | 93 | 17 | 0 | 0 | UA,WN |
| Nov 2024 | 89 | 25 | 1 | 1 | UA,WN |
| Oct 2024 | 93 | 10 | 0 | 0 | UA,WN |
| Sep 2024 | 90 | 17 | 0 | 0 | WN,UA |
| Aug 2024 | 94 | 41 | 0 | 0 | WN,UA |
| Jul 2024 | 97 | 30 | 2 | 1 | UA,WN |
| Jun 2024 | 94 | 23 | 0 | 0 | UA,WN |
| May 2024 | 97 | 30 | 0 | 0 | UA,WN |
| Apr 2024 | 90 | 19 | 0 | 1 | OO,UA,WN |
| Mar 2024 | 93 | 19 | 1 | 0 | UA,WN |
| Feb 2024 | 87 | 21 | 1 | 0 | UA,WN |
| Jan 2024 | 93 | 28 | 1 | 0 | WN,OO,UA |
Cancellation Rate
0.6%
12 of 2,154 flights
Diversion Rate
0.3%
6 of 2,154 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
DEN - Denver
Full on-time, delay-cause, and seasonal performance for Denver, CO.
Origin airport →SDF - Louisville
Full on-time, delay-cause, and seasonal performance for Louisville, KY.
Destination airport →Compare the two airports
See DEN and SDF side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to DEN–SDF.
Routes with a similar on-time rate
What the Data Says About DEN to SDF
On-time performance on the DEN to SDF pairing (Denver to Louisville) trails a chunk of the network: 72.9% of 5,952 tracked flights arrived on schedule, with a 64.5-minute average delay on the ones that ran late. The route spans about 1,024 miles across 19 carriers. Cancellations over the trailing 24 months hit 0.6% (12 of 2,154 flights), with 0.3% diverted.
The monthly split is wide on this route: Oct 2024 posted the strongest performance at 89% on-time, while Jul 2025 came in at just 53% - a 37-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from DEN to SDF? ▼
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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.