Flight Reliability
UA 4871 · United Airlines
Washington → Rochester (IAD–ROC)98% of its flights flew this route. The rest (XNA–IAH) are included in these numbers.
- 70%
- Arrive within 15 minutes
- 19 min
- Average arrival delay
- 6.3%
- Cancelled
- 2 min
- Median arrival delay
Based on 174 historical flights. Data through May 2026.
What the data says
Saturdays have been rough.
UA 4871 arrived on time 82% of the time on Tuesdays and just 58% on Saturdays. That gap is worth planning around.
Lagging the IAD–ROC route.
UA 4871 arrived on time 70% of the time, versus 78% across the IAD–ROC route.
Lagging the United Airlines network.
UA 4871 arrived on time 70% of the time, versus 79% across the United Airlines network.
Keep a backup plan handy.
UA 4871 was cancelled 6.3% of the time. Typical for U.S. flights is around 1–2%.
The breakdown
- Mon74%(23 flights)
- Tue82%(22 flights)
- Wed73%(22 flights)
- Thu79%(24 flights)
- Fri65%(26 flights)
- Sat58%(19 flights)
- Sun59%(27 flights)
Jun 54% → May 91% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 54% | 28 |
| July 2025 | 58% | 24 |
| August 2025 | 68% | 31 |
| September 2025 | 79% | 29 |
| October 2025 | 86% | 21 |
| December 2025 | 73% | 11 |
| May 2026 | 91% | 11 |
- Departures on time
- 74%
- Diverted
- 0%
- Flights flown
- 163
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 174 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.