UA 335 then QF 3748 at San Francisco
Eugene → San Francisco → San Diego
Timetable, San Francisco time
07:40UA 335 from Eugene at the gatealso NZ 9173
20:00QF 3748 to San Diego leaves the gate
12 h 20 apart on the timetable
QF 3748 leaves 12 h 20 after UA 335 arrives on the timetable: more than half a day, so not a connection we count.