About 1 in 2 UA 1375 flights from Ontario arrived 15+ minutes late, diverted or cancelled over the past year (46%); 0.0% were cancelled. The typical flight landed 13 minutes late.
UA 1375: ONT → SFO
Scheduled to leave Ontario at 1:50 p.m. local time. Over the past year it arrived on time 54% of the time (160 flights), worse than other UA flights on the route at that hour (65%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 23 | 52% |
| Tuesday | 22 | 50% |
| Wednesday | 22 | 55% |
| Thursday | 24 | 54% |
| Friday | 23 | 43% |
| Saturday | 23 | 61% |
| Sunday | 23 | 61% |
Why it was late
All flights ONT → SFO · Connecting off UA 1375? Check the risk
Questions
How often is UA 1375 from ONT to SFO late?
United Airlines 1375 from Ontario, CA to San Francisco, CA arrived 15 or more minutes late, was diverted or was cancelled on 46% of 160 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check United Airlines for today's flight. Method.