Flight Reliability
UA 4833 · United Airlines
ROA → Washington (ROA–IAD)99% of its flights flew this route. The rest (RIC–IAD) are included in these numbers.
- 77%
- Arrive within 15 minutes
- 19 min
- Average arrival delay
- 0.9%
- Cancelled
- 5 min early
- Median arrival delay
Based on 323 historical flights. Data through May 2026.
What the data says
12–3 PM has a slight edge.
Departures between 12–3 PM arrived on time 78% of the time, against 75% between 3–6 PM.
Friday is doing you no favors.
UA 4833 arrived on time 93% of the time on Saturdays and just 68% on Fridays. That gap is worth planning around.
Lagging the ROA–IAD route.
UA 4833 arrived on time 77% of the time, versus 84% across the ROA–IAD route.
Recent months have been rougher.
UA 4833 arrived on time 70% of the time over the last three months in the data, compared with 84% in the three months before that.
The breakdown
- Mon76%(50 flights)
- Tue77%(51 flights)
- Wed79%(52 flights)
- Thu73%(52 flights)
- Fri68%(47 flights)
- Sat93%(29 flights)
- Sun80%(39 flights)
- 12–3 PM78%(188 flights)
- 3–6 PM75%(132 flights)
Jun 48% → May 58% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 48% | 21 |
| July 2025 | 77% | 22 |
| August 2025 | 60% | 20 |
| September 2025 | 88% | 24 |
| October 2025 | 90% | 31 |
| November 2025 | 87% | 30 |
| December 2025 | 71% | 31 |
| January 2026 | 86% | 29 |
| February 2026 | 96% | 24 |
| March 2026 | 63% | 27 |
| April 2026 | 90% | 30 |
| May 2026 | 58% | 31 |
- Departures on time
- 80%
- Diverted
- 0%
- Flights flown
- 320
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 323 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.