UA 1909 then QF 3741 at San Francisco
San Luis Obispo → San Francisco → San Diego
Timetable, San Francisco time
09:06UA 1909 from San Luis Obispo at the gatealso LH 8577
07:04QF 3741 to San Diego leaves the gate
21 h 58 apart on the timetable, overnight
QF 3741 leaves 21 h 58 after UA 1909 arrives on the timetable: more than half a day, so not a connection we count.