UA 751 then QR 3422 at San Francisco
Portland (Oregon) → San Francisco → San Diego
Timetable, San Francisco time
15:15UA 751 from Portland (Oregon) at the gatealso CM 1419
07:04QR 3422 to San Diego leaves the gate
15 h 49 apart on the timetable, overnight
QR 3422 leaves 15 h 49 after UA 751 arrives on the timetable: more than half a day, so not a connection we count.