Flight Reliability
UA 4951 · United Airlines
MOB → Washington (MOB–IAD)
85
Pretty Reliable
WanderNerd Reliability Score
- 82%
- Arrive within 15 minutes
- 5 min
- Average arrival delay
- 1.0%
- Cancelled
- 11 min early
- Median arrival delay
Based on 301 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
UA 4951 arrived on time 86% of the time on Tuesdays. On Fridays: 77%.
A bit ahead of the United Airlines network.
UA 4951 arrived on time 82% of the time, versus 79% across the United Airlines network.
Ticking up lately.
UA 4951 arrived on time 85% of the time over the last three months in the data, compared with 82% in the three months before that.
The breakdown
- Mon84%(43 flights)
- Tue86%(42 flights)
- Wed81%(43 flights)
- Thu83%(42 flights)
- Fri77%(43 flights)
- Sat81%(43 flights)
- Sun83%(41 flights)
82%
Mar
Jun 83% → Mar 82% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 83% | 29 |
| July 2025 | 70% | 30 |
| August 2025 | 81% | 31 |
| September 2025 | 90% | 30 |
| October 2025 | 84% | 31 |
| November 2025 | 83% | 30 |
| December 2025 | 77% | 31 |
| January 2026 | 83% | 30 |
| February 2026 | 89% | 27 |
| March 2026 | 82% | 28 |
- Departures on time
- 86%
- Diverted
- 0.3%
- Flights flown
- 297
- Months covered
- 10
Same route, other flights
Keep nerding
Based on 301 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.