Denver (DEN) to Louisville (SDF) flights
United Airlines, Southwest Airlines fly nonstop from Denver International Airport to Louisville Muhammad Ali International Airport, with about 21 flights a week in July 2026. The 1,024-mile flight takes about 2h 33m gate to gate.
- Distance
- 1,024 mi · 1,648 km
- Flight time
- 2h 33m
- Airlines
- 2
- Seats filled
- 77%
Airlines flying DEN to SDF
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 15 | Airbus A319, Airbus A320-100/200, Boeing 737-800 | 77,488 | 2h 37m |
| Southwest Airlines | 7 | Boeing 737 MAX 8, Boeing 737-800, Boeing 737-700 / MAX 7 | 44,221 | 2h 24m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
DEN to SDF flight schedule
6 flight numbers flew this route in August 2026, 2 of them almost daily. The first usually leaves at 9:45am and the last at 6:08pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| UA 1479United Airlines | 9:45am | 2:29pm | 31 | 90% |
| WN 3384Southwest Airlines | 11:20am | 3:55pm | 4 | n/a |
| WN 4502Southwest Airlines | 12:50pm | 5:20pm | 12 | 58% |
| UA 514United Airlines | 5:45pm | 10:31pm | 21 | 62% |
| WN 3575Southwest Airlines | 5:45pm | 10:30pm | 12 | 75% |
| UA 2027United Airlines | 6:08pm | 10:59pm | 10 | 69% |
Is DEN to SDF on time?
From September 2025 to August 2026, 78% of 1,095 flights arrived within 15 minutes of schedule and 0.8% were cancelled. Flights leaving around 9am were the most punctual (90%), those around 6pm the least (64%). Most delay time was caused by late-arriving aircraft (52%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 730 | 83% | 12 min | 0.7% |
| Southwest Airlines | 365 | 69% | 17 min | 1.1% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 9am to 10am | 365 | 90% | |
| 11am to 12pm | 59 | 75% | |
| 12pm to 1pm | 89 | 71% | |
| 1pm to 2pm | 23 | 83% | |
| 4pm to 5pm | 38 | 82% | |
| 5pm to 6pm | 306 | 79% | |
| 6pm to 7pm | 115 | 64% | |
| 7pm to 8pm | 46 | 47% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 94 | 9,512 | |
| September 2025 | 90 | 10,976 | |
| October 2025 | 93 | 11,456 | |
| November 2025 | 88 | 8,971 | |
| December 2025 | 93 | 9,425 | |
| January 2026 | 89 | 8,376 | |
| February 2026 | 84 | 9,104 | |
| March 2026 | 92 | 10,466 | |
| April 2026 | 93 | 10,627 | |
| May 2026 | 94 | 10,224 | |
| June 2026 | 90 | 11,008 | |
| July 2026 | 95 | 11,750 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.