UA 2 then QF 3741 at San Francisco
Singapore → San Francisco → San Diego
Timetable, San Francisco time
09:15UA 2 from Singapore at the gate
07:04QF 3741 to San Diego leaves the gate
21 h 49 apart on the timetable, overnight
QF 3741 leaves 21 h 49 after UA 2 arrives on the timetable: more than half a day, so not a connection we count.