Flight OddsUA1851 ORD → ONT
United Airlines · Chicago, IL to Ontario, CA · 24 flights observed, 2026-03-05 to 2026-03-28 · 1,700 mi
UA1851 covers more than one route in the data window — the stats below are for ORD → ONT, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
52%
Median delay
+13 min
90th percentile
+148 min
Cancellation rate
4%
How often is UA1851 on time?
Across 24 flights on ORD → ONT from 2026-03-05 to 2026-03-28, UA1851 arrived within 15 minutes of schedule 52% of the time. The median arrival delay was +13 min, and the worst 10% of flights arrived +148 min or later. 4% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 12 | 52% |
| 16-30 min | 2 | 9% |
| 31-60 min | 4 | 17% |
| 61-120 min | 1 | 4% |
| 2+ hrs | 4 | 17% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-03 | 23 | 52% | +35 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 100% |
| Tue | 3 | 33% |
| Wed | 3 | 67% |
| Thu | 4 | 50% |
| Fri | 3 | 33% |
| Sat | 4 | 50% |
| Sun | 3 | 33% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…