Flight Reliability
UA 4664 · United Airlines
Denver → BIS (DEN–BIS)82% of its flights flew this route. The rest (LIT–IAH, LNK–ORD) are included in these numbers.
80
Pretty Reliable
WanderNerd Reliability Score
- 79%
- Arrive within 15 minutes
- 11 min
- Average arrival delay
- 1.1%
- Cancelled
- 7 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
12–3 PM has a slight edge.
Departures between 12–3 PM arrived on time 80% of the time, against 74% between 3–6 PM.
Friday is doing you no favors.
UA 4664 arrived on time 84% of the time on Tuesdays. On Fridays: 73%.
Trending in the right direction.
UA 4664 arrived on time 74% of the time over the last three months in the data, compared with 65% in the three months before that.
The breakdown
- Mon75%(52 flights)
- Tue84%(50 flights)
- Wed82%(51 flights)
- Thu81%(52 flights)
- Fri73%(51 flights)
- Sat80%(51 flights)
- Sun77%(52 flights)
- 12–3 PM80%(294 flights)
- 3–6 PM74%(65 flights)
81%
May
Jun 93% → May 81% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 93% | 29 |
| July 2025 | 87% | 31 |
| August 2025 | 81% | 31 |
| September 2025 | 87% | 30 |
| October 2025 | 90% | 30 |
| November 2025 | 93% | 28 |
| December 2025 | 63% | 30 |
| January 2026 | 61% | 31 |
| February 2026 | 71% | 28 |
| March 2026 | 77% | 30 |
| April 2026 | 63% | 30 |
| May 2026 | 81% | 31 |
- Departures on time
- 80%
- Diverted
- 0.5%
- Flights flown
- 359
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 365 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.