Flight OddsUA4239 IAD → BUF
United Airlines · Washington, DC to Buffalo, NY · 14 flights observed, 2025-12-02 to 2025-12-17 · 283 mi
UA4239 covers more than one route in the data window — the stats below are for IAD → BUF, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
86%
Median delay
-3 min
90th percentile
+35 min
Cancellation rate
0%
How often is UA4239 on time?
Across 14 flights on IAD → BUF from 2025-12-02 to 2025-12-17, UA4239 arrived within 15 minutes of schedule 86% of the time. The median arrival delay was -3 min, and the worst 10% of flights arrived +35 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 12 | 86% |
| 16-30 min | 0 | 0% |
| 31-60 min | 1 | 7% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 1 | 7% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-12 | 14 | 86% | +13 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 2 | 100% |
| Tue | 3 | 67% |
| Wed | 3 | 100% |
| Thu | 2 | 100% |
| Fri | 2 | 50% |
| Sat | No data | — |
| Sun | 2 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…