Flight OddsUA4877 IAD → ROC
United Airlines · Washington, DC to Rochester, NY · 135 flights observed, 2025-07-01 to 2026-04-29 · 287 mi
UA4877 covers more than one route in the data window — the stats below are for IAD → ROC, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
87%
Median delay
-5 min
90th percentile
+27 min
Cancellation rate
2%
How often is UA4877 on time?
Across 135 flights on IAD → ROC from 2025-07-01 to 2026-04-29, UA4877 arrived within 15 minutes of schedule 87% of the time. The median arrival delay was -5 min, and the worst 10% of flights arrived +27 min or later. 2% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 114 | 87% |
| 16-30 min | 5 | 4% |
| 31-60 min | 2 | 2% |
| 61-120 min | 2 | 2% |
| 2+ hrs | 8 | 6% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 27 | 81% | +24 min |
| 2025-08 | 15 | 100% | -2 min |
| 2025-12 | 13 | 77% | +63 min |
| 2026-01 | 16 | 88% | -2 min |
| 2026-02 | 23 | 91% | +2 min |
| 2026-03 | 27 | 85% | +8 min |
| 2026-04 | 10 | 90% | +27 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 19 | 79% |
| Tue | 15 | 80% |
| Wed | 20 | 90% |
| Thu | 21 | 81% |
| Fri | 23 | 96% |
| Sat | 13 | 92% |
| Sun | 20 | 90% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…