Flight Reliability
UA 4935 · United Airlines
Buffalo → Washington (BUF–IAD)
85
Pretty Reliable
WanderNerd Reliability Score
- 90%
- Arrive within 15 minutes
- 6 min
- Average arrival delay
- 2.5%
- Cancelled
- 9 min early
- Median arrival delay
Based on 119 historical flights. Data through May 2026.
What the data says
Mondays have been rough.
UA 4935 arrived on time 100% of the time on Thursdays and just 73% on Mondays. That gap is worth planning around.
Better than the BUF–IAD route average.
UA 4935 arrived on time 90% of the time, versus 82% across the BUF–IAD route.
Better than the United Airlines network average.
UA 4935 arrived on time 90% of the time, versus 79% across the United Airlines network.
The breakdown
- Mon73%(15 flights)
- Tue82%(17 flights)
- Wed92%(13 flights)
- Thu100%(19 flights)
- Fri100%(18 flights)
- Sat89%(18 flights)
- Sun93%(15 flights)
86%
Apr
Oct 100% → Apr 86% on time
| Month | On-time percentage | Flights |
|---|---|---|
| October 2025 | 100% | 25 |
| January 2026 | 84% | 25 |
| February 2026 | 91% | 11 |
| March 2026 | 92% | 24 |
| April 2026 | 86% | 22 |
- Departures on time
- 90%
- Diverted
- 0.8%
- Flights flown
- 115
- Months covered
- 7
Same route, other flights
Keep nerding
Based on 119 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.