Route · SDF → DEN · 2020–2025 BTS data
Louisville to Denver
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SDF to DEN (Louisville to Denver) ranks #2098 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 83.6%
- On-time
- +4.6 pts
- vs US avg
- 75 min
- Delay when late
- 5,950
- Flights
- #2098 of 4927
- Corpus placement
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 |
SDF–DEN seasonal on-time pattern
Best: November (90.9%) · weakest: June (77.2%)
Strongest calendar month
November
90.9% on-time · ~84 flights/mo
Busiest calendar month
October
~93 flights/mo avg
Weakest calendar month
June
77.2% on-time · ~86 flights/mo
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.
SDF on-time profileDEN - Denver
Full on-time, delay-cause, and seasonal performance for Denver, CO.
DEN on-time profileCompare the two airports
See SDF and DEN side by side on delays, cancellations, and reliability.
Compare SDF vs DENOrigin-hub reliability standing
Mid-pack among SDF departures
From SDF, this corridor sits with 13 other 75–85% on-time routes out of 23 tracked departures, not the hub's reliability leaders (9 at ≥85%) and not the softest ( 1 below 75%). Destination: Denver · fleet on-time rank #1740 of 4927.
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.
On the multi-year calendar, SDF–DEN peaks in November at 90.9% on-time while October carries the heaviest traffic (~93 flights per month) ; the softest month is June at 77.2%, a 13.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does SDF to DEN rank among US routes by traffic? ▼
How often are flights delayed from SDF to DEN? ▼
What is the cancellation rate for SDF to DEN? ▼
How far is the flight from SDF to DEN? ▼
When is the best time to fly from SDF to DEN? ▼
Airports on this route
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.
Using SDF–DEN data
SDF–DEN runs 4.6 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare SDF and DEN airport profiles: delay causes and top routes differ even on the same corridor. SDF airport
- If your dates flex, November (90.9% on-time) beats June (77.2%) on this corridor. Seasonal chart
- 4 other routes post a similar 83.6% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
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.