Flight Reliability
UA 5512 · United Airlines
Denver → MLI (DEN–MLI)
77
Usually Fine
WanderNerd Reliability Score
- 71%
- Arrive within 15 minutes
- 13 min
- Average arrival delay
- 0%
- Cancelled
- 1 min early
- Median arrival delay
Based on 364 historical flights. Data through May 2026.
What the data says
The late departure is the smart one here.
UA 5512 departing between 6–9 PM arrived on time 88% of the time, versus 69% between 3–6 PM.
Friday is doing you no favors.
UA 5512 arrived on time 77% of the time on Thursdays and just 62% on Fridays. That gap is worth planning around.
Lagging the United Airlines network.
UA 5512 arrived on time 71% of the time, versus 79% across the United Airlines network.
It basically never cancels.
Out of 364 scheduled flights, only 0.0% were cancelled.
The breakdown
- Mon69%(52 flights)
- Tue71%(52 flights)
- Wed71%(52 flights)
- Thu77%(51 flights)
- Fri62%(52 flights)
- Sat69%(52 flights)
- Sun76%(53 flights)
- 3–6 PM69%(332 flights)
- 6–9 PM88%(32 flights)
71%
May
Jun 60% → May 71% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 60% | 30 |
| July 2025 | 39% | 31 |
| August 2025 | 45% | 31 |
| September 2025 | 63% | 30 |
| October 2025 | 81% | 31 |
| November 2025 | 86% | 29 |
| December 2025 | 68% | 31 |
| January 2026 | 84% | 31 |
| February 2026 | 79% | 28 |
| March 2026 | 87% | 31 |
| April 2026 | 87% | 30 |
| May 2026 | 71% | 31 |
- Departures on time
- 76%
- Diverted
- 0%
- Flights flown
- 364
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 364 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.