UA 3909 then UA 794 at San Francisco
Houston → San Francisco → San Diego
Timetable, San Francisco time
07:17UA 3909 from Houston at the gate
20:45UA 794 to San Diego leaves the gatealso CM 2510, LX 3272, AC 4536, VA 8428
13 h 28 apart on the timetable
UA 794 leaves 13 h 28 after UA 3909 arrives on the timetable: more than half a day, so not a connection we count.