Flight Reliability
UA 5966 · United Airlines
ACV → Denver (ACV–DEN)
83
Pretty Reliable
WanderNerd Reliability Score
- 82%
- Arrive within 15 minutes
- 12 min
- Average arrival delay
- 0.6%
- Cancelled
- 6 min early
- Median arrival delay
Based on 346 historical flights. Data through May 2026.
What the data says
Skip Saturday if you can.
UA 5966 arrived on time 86% of the time on Fridays. On Saturdays: 77%.
Recent months have been rougher.
UA 5966 arrived on time 74% of the time over the last three months in the data, compared with 84% in the three months before that.
The breakdown
- Mon79%(48 flights)
- Tue78%(50 flights)
- Wed80%(49 flights)
- Thu85%(48 flights)
- Fri86%(49 flights)
- Sat77%(48 flights)
- Sun86%(49 flights)
67%
May
Jun 83% → May 67% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 83% | 30 |
| July 2025 | 76% | 29 |
| August 2025 | 75% | 12 |
| September 2025 | 80% | 30 |
| October 2025 | 94% | 31 |
| November 2025 | 90% | 29 |
| December 2025 | 90% | 31 |
| January 2026 | 87% | 31 |
| February 2026 | 75% | 28 |
| March 2026 | 83% | 30 |
| April 2026 | 73% | 30 |
| May 2026 | 67% | 30 |
- Departures on time
- 85%
- Diverted
- 0.9%
- Flights flown
- 341
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 346 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.