Flight OddsUA1851 ONT → SFO
United Airlines · Ontario, CA to San Francisco, CA · 15 flights observed, 2026-04-30 to 2026-05-18 · 363 mi
UA1851 covers more than one route in the data window — the stats below are for ONT → SFO, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
33%
Median delay
+52 min
90th percentile
+86 min
Cancellation rate
0%
How often is UA1851 on time?
Across 15 flights on ONT → SFO from 2026-04-30 to 2026-05-18, UA1851 arrived within 15 minutes of schedule 33% of the time. The median arrival delay was +52 min, and the worst 10% of flights arrived +86 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 | 5 | 33% |
| 16-30 min | 0 | 0% |
| 31-60 min | 4 | 27% |
| 61-120 min | 6 | 40% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-04 | 1 | 0% | +40 min |
| 2026-05 | 14 | 36% | +40 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 0% |
| Tue | No data | — |
| Wed | No data | — |
| Thu | 3 | 67% |
| Fri | 3 | 33% |
| Sat | 3 | 67% |
| Sun | 3 | 0% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…