Flight Reliability
UA 5815 · United Airlines
Denver → Birmingham (DEN–BHM)
86
Pretty Reliable
WanderNerd Reliability Score
- 79%
- Arrive within 15 minutes
- 5 min
- Average arrival delay
- 0.3%
- Cancelled
- 11 min early
- Median arrival delay
Based on 353 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
UA 5815 arrived on time 90% of the time on Wednesdays and just 69% on Fridays. That gap is worth planning around.
A bit ahead of the DEN–BHM route.
UA 5815 arrived on time 79% of the time, versus 75% across the DEN–BHM route.
It basically never cancels.
Out of 353 scheduled flights, only 0.3% were cancelled.
The breakdown
- Mon80%(51 flights)
- Tue73%(51 flights)
- Wed90%(51 flights)
- Thu78%(49 flights)
- Fri69%(49 flights)
- Sat74%(50 flights)
- Sun86%(51 flights)
75%
May
Jun 60% → May 75% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 60% | 30 |
| July 2025 | 71% | 31 |
| August 2025 | 74% | 31 |
| September 2025 | 73% | 30 |
| October 2025 | 94% | 31 |
| November 2025 | 93% | 29 |
| December 2025 | 71% | 31 |
| January 2026 | 87% | 31 |
| February 2026 | 79% | 28 |
| March 2026 | 87% | 30 |
| April 2026 | 80% | 30 |
| May 2026 | 75% | 20 |
- Departures on time
- 82%
- Diverted
- 0%
- Flights flown
- 352
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 353 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.