Flight Reliability
UA 4964 · United Airlines
Washington → MDT (IAD–MDT)
79
Usually Fine
WanderNerd Reliability Score
- 79%
- Arrive within 15 minutes
- 12 min
- Average arrival delay
- 1.5%
- Cancelled
- 0 min
- Median arrival delay
Based on 133 historical flights. Data through May 2026.
What the data says
Thursdays have been rough.
UA 4964 arrived on time 92% of the time on Tuesdays and just 71% on Thursdays. That gap is worth planning around.
The breakdown
- Mon79%(19 flights)
- Tue92%(12 flights)
- Wed72%(18 flights)
- Thu71%(21 flights)
- Fri75%(20 flights)
- Sat81%(21 flights)
- Sun85%(20 flights)
83%
May
Jul 48% → May 83% on time
| Month | On-time percentage | Flights |
|---|---|---|
| July 2025 | 48% | 25 |
| August 2025 | 88% | 16 |
| March 2026 | 85% | 26 |
| April 2026 | 93% | 30 |
| May 2026 | 83% | 29 |
- Departures on time
- 77%
- Diverted
- 0%
- Flights flown
- 131
- Months covered
- 6
Same route, other flights
Keep nerding
Based on 133 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.