Flight OddsUA4831 IAD → ROA
United Airlines · Washington, DC to Roanoke, VA · 321 flights observed, 2025-07-01 to 2026-06-24 · 177 mi
UA4831 covers more than one route in the data window — the stats below are for IAD → ROA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
81%
Median delay
-5 min
90th percentile
+49 min
Cancellation rate
1%
How often is UA4831 on time?
Across 321 flights on IAD → ROA from 2025-07-01 to 2026-06-24, UA4831 arrived within 15 minutes of schedule 81% of the time. The median arrival delay was -5 min, and the worst 10% of flights arrived +49 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 257 | 81% |
| 16-30 min | 19 | 6% |
| 31-60 min | 16 | 5% |
| 61-120 min | 10 | 3% |
| 2+ hrs | 17 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 23 | 78% | +11 min |
| 2025-08 | 20 | 65% | +43 min |
| 2025-09 | 24 | 100% | -5 min |
| 2025-10 | 31 | 87% | -3 min |
| 2025-11 | 30 | 90% | -8 min |
| 2025-12 | 31 | 74% | +16 min |
| 2026-01 | 30 | 80% | +8 min |
| 2026-02 | 24 | 96% | -13 min |
| 2026-03 | 27 | 67% | +23 min |
| 2026-04 | 30 | 87% | +9 min |
| 2026-05 | 29 | 66% | +33 min |
| 2026-06 | 20 | 75% | +10 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 50 | 74% |
| Tue | 52 | 88% |
| Wed | 51 | 86% |
| Thu | 51 | 80% |
| Fri | 46 | 72% |
| Sat | 27 | 85% |
| Sun | 42 | 79% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…