CX 7945 then UA 552 at San Francisco
San Diego → San Francisco → Ontario
Timetable, San Francisco time
08:52CX 7945 from San Diego at the gate
21:20UA 552 to Ontario leaves the gatealso CM 1456
12 h 28 apart on the timetable
UA 552 leaves 12 h 28 after CX 7945 arrives on the timetable: more than half a day, so not a connection we count.