Route
SDF → DEN
Louisville Muhammad Ali International Airport Denver International Airport
How punctual is this route?
- On-time arrivals
- 84.1%
- Less than 15 minutes late
- Cancelled
- 1.0%
- Of scheduled flights
- Average delay when late
- 72 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,096
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 46%
- Air traffic control & airport 26%
- Late-arriving aircraft 25%
- Extreme weather 3%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 92.2% | 90 |
| October 2025 | 84.9% | 93 |
| November 2025 | 92.0% | 89 |
| December 2025 | 69.6% | 93 |
| January 2026 | 88.5% | 93 |
| February 2026 | 79.8% | 84 |
| March 2026 | 81.5% | 93 |
| April 2026 | 87.9% | 92 |
| May 2026 | 84.2% | 95 |
| June 2026 | 76.1% | 90 |
| July 2026 | 87.5% | 91 |
| August 2026 | 84.8% | 93 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| United Airlines | 730 | 85.8% | 1.0% | 78 min |
| Southwest Airlines | 366 | 80.6% | 1.1% | 62 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA1510
19% late · 363 flights
-
UA1506
5% late · 82 flights
-
WN1297
21% late · 43 flights
-
WN3530
15% late · 42 flights
-
UA1561
6% late · 37 flights
-
UA703
8% late · 37 flights
-
UA1180
0% late · 32 flights
-
WN2137
10% late · 32 flights
-
WN4984
0% late · 28 flights
-
UA730
4% late · 26 flights
-
WN3328
36% late · 25 flights
-
UA2459
4% late · 24 flights
-
UA295
12% late · 24 flights
-
WN2737
45% late · 22 flights
-
UA1320
14% late · 21 flights
-
UA1547
24% late · 21 flights
-
UA501
0% late · 21 flights
-
WN2837
40% late · 20 flights
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