Flight OddsUA4381 BUF → ORD
United Airlines · Buffalo, NY to Chicago, IL · 293 flights observed, 2025-07-01 to 2026-06-30 · 474 mi
UA4381 covers more than one route in the data window — the stats below are for BUF → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
71%
Median delay
0 min
90th percentile
+90 min
Cancellation rate
2%
How often is UA4381 on time?
Across 293 flights on BUF → ORD from 2025-07-01 to 2026-06-30, UA4381 arrived within 15 minutes of schedule 71% of the time. The median arrival delay was 0 min, and the worst 10% of flights arrived +90 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 | 204 | 71% |
| 16-30 min | 16 | 6% |
| 31-60 min | 19 | 7% |
| 61-120 min | 24 | 8% |
| 2+ hrs | 23 | 8% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 26 | 65% | +21 min |
| 2025-08 | 28 | 79% | +9 min |
| 2025-09 | 30 | 87% | +17 min |
| 2025-10 | 31 | 74% | +16 min |
| 2025-11 | 27 | 52% | +120 min |
| 2025-12 | 30 | 50% | +70 min |
| 2026-01 | 5 | 100% | -12 min |
| 2026-02 | 16 | 69% | +12 min |
| 2026-03 | 7 | 86% | +38 min |
| 2026-04 | 28 | 71% | +30 min |
| 2026-05 | 30 | 80% | +17 min |
| 2026-06 | 28 | 75% | +13 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 42 | 71% |
| Tue | 43 | 70% |
| Wed | 42 | 74% |
| Thu | 39 | 77% |
| Fri | 42 | 69% |
| Sat | 34 | 76% |
| Sun | 44 | 64% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…