Flight Reliability
UA 4874 · United Airlines
Rochester → Washington (ROC–IAD)84% of its flights flew this route. The rest (IAD–MDT, CRP–IAH) are included in these numbers.
- 80%
- Arrive within 15 minutes
- 32 min
- Average arrival delay
- 5.2%
- Cancelled
- 7 min early
- Median arrival delay
Based on 172 historical flights. Data through May 2026.
What the data says
The late departure is the smart one here.
UA 4874 departing between 6–9 PM arrived on time 82% of the time, versus 70% between 9 PM–12 AM.
Saturdays have been rough.
UA 4874 arrived on time 87% of the time on Mondays and just 65% on Saturdays. That gap is worth planning around.
Keep a backup plan handy.
UA 4874 was cancelled 5.2% of the time. Typical for U.S. flights is around 1–2%.
Trending in the right direction.
UA 4874 arrived on time 89% of the time over the last three months in the data, compared with 78% in the three months before that.
The breakdown
- Mon87%(23 flights)
- Tue86%(22 flights)
- Wed86%(21 flights)
- Thu85%(26 flights)
- Fri76%(25 flights)
- Sat65%(20 flights)
- Sun73%(26 flights)
- 6–9 PM82%(136 flights)
- 9 PM–12 AM70%(27 flights)
Jun 62% → May 91% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 62% | 29 |
| July 2025 | 58% | 24 |
| August 2025 | 87% | 31 |
| September 2025 | 90% | 29 |
| October 2025 | 95% | 21 |
| December 2025 | 82% | 11 |
| May 2026 | 91% | 11 |
- Departures on time
- 80%
- Diverted
- 0%
- Flights flown
- 163
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 172 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.