About 1 in 9 UA 4640 flights from Huntsville arrived 15+ minutes late, diverted or cancelled over the past year (11%); 0.0% were cancelled. The typical flight landed 11 minutes early.
UA 4640: HSV → DEN
Scheduled to leave Huntsville at 8:00 a.m. local time, operated by SkyWest as OO 4640. Over the past year it arrived on time 89% of the time (365 flights), in line with other UA flights on the route at that hour (89%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 92% |
| Tuesday | 52 | 83% |
| Wednesday | 52 | 90% |
| Thursday | 52 | 85% |
| Friday | 52 | 88% |
| Saturday | 52 | 96% |
| Sunday | 52 | 90% |
Why it was late
All flights HSV → DEN · Connecting off UA 4640? Check the risk
UA 4640: DEN → GUC
Scheduled to leave Denver at 1:30 p.m. local time, operated by SkyWest as OO 4640. Over the past year it arrived on time 85% of the time (135 flights), in line with other UA flights on the route at that hour (86%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 19 | — |
| Tuesday | 18 | — |
| Wednesday | 18 | — |
| Thursday | 20 | 85% |
| Friday | 20 | 85% |
| Saturday | 20 | 80% |
| Sunday | 20 | 90% |
Why it was late
All flights DEN → GUC · Connecting off UA 4640? Check the risk
Questions
How often is UA 4640 from HSV to DEN late?
United Airlines 4640 from Huntsville, AL to Denver, CO arrived 15 or more minutes late, was diverted or was cancelled on 11% of 365 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.
How often is UA 4640 from DEN to GUC late?
United Airlines 4640 from Denver, CO to Gunnison, CO arrived 15 or more minutes late, was diverted or was cancelled on 15% of 135 scheduled flights between September 2025 and August 2026. 0.7% 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.