About 1 in 5 UA 1510 flights from Louisville arrived 15+ minutes late, diverted or cancelled over the past year (21%); 1.4% were cancelled. The typical flight landed 11 minutes early.
UA 1510: SDF → DEN
Scheduled to leave Louisville at 3:25 p.m. local time. Over the past year it arrived on time 79% of the time (363 flights), in line with other UA flights on the route at that hour (79%). Last seen in the data Aug 31, 2026.
Usually United Airlines's last flight of the day from Louisville to Denver (100% of days). United Airlines's last SDF–DEN flight was cancelled 1.4% of the time, against 0.5% for its earlier ones. If it's cancelled, the next United Airlines flight is usually around 8:00 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 87% |
| Tuesday | 52 | 83% |
| Wednesday | 52 | 75% |
| Thursday | 51 | 75% |
| Friday | 52 | 77% |
| Saturday | 51 | 78% |
| Sunday | 52 | 75% |
Why it was late
All flights SDF → DEN · Connecting off UA 1510? Check the risk
UA 1510: DEN → PHL
Scheduled to leave Denver at 5:54 p.m. local time. Over the past year it arrived on time 54% of the time (123 flights), worse than other UA flights on the route at that hour (70%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 18 | — |
| Tuesday | 17 | — |
| Wednesday | 17 | — |
| Thursday | 18 | — |
| Friday | 18 | — |
| Saturday | 17 | — |
| Sunday | 18 | — |
Why it was late
All flights DEN → PHL · Connecting off UA 1510? Check the risk
Questions
How often is UA 1510 from SDF to DEN late?
United Airlines 1510 from Louisville, KY to Denver, CO arrived 15 or more minutes late, was diverted or was cancelled on 21% of 363 scheduled flights between September 2025 and August 2026. 1.4% were cancelled.
How often is UA 1510 from DEN to PHL late?
United Airlines 1510 from Denver, CO to Philadelphia, PA arrived 15 or more minutes late, was diverted or was cancelled on 46% of 123 scheduled flights between September 2025 and August 2026. 0.8% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check United Airlines for today's flight. Method.