Flight Reliability
UA 4812 · United Airlines
Washington → Albany (IAD–ALB)
69
Usually Fine
WanderNerd Reliability Score
- 77%
- Arrive within 15 minutes
- 29 min
- Average arrival delay
- 1.8%
- Cancelled
- 10 min early
- Median arrival delay
Based on 342 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
UA 4812 arrived on time 87% of the time on Saturdays and just 67% on Fridays. That gap is worth planning around.
Slipping a little lately.
UA 4812 arrived on time 74% of the time over the last three months in the data, compared with 79% in the three months before that.
The breakdown
- Mon76%(49 flights)
- Tue76%(45 flights)
- Wed84%(45 flights)
- Thu72%(47 flights)
- Fri67%(51 flights)
- Sat87%(47 flights)
- Sun81%(52 flights)
68%
May
Jun 67% → May 68% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 67% | 30 |
| July 2025 | 73% | 30 |
| August 2025 | 81% | 31 |
| September 2025 | 87% | 30 |
| October 2025 | 87% | 31 |
| November 2025 | 83% | 29 |
| December 2025 | 66% | 29 |
| January 2026 | 85% | 13 |
| February 2026 | 86% | 21 |
| March 2026 | 68% | 31 |
| April 2026 | 87% | 30 |
| May 2026 | 68% | 31 |
- Departures on time
- 76%
- Diverted
- 0%
- Flights flown
- 336
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 342 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.