UA 1970 then UA 1561 at San Francisco
Cleveland → San Francisco → San Diego
Timetable, San Francisco time
21:45UA 1970 from Cleveland at the gatealso VA 8489, NZ 9046, OZ 9526
16:55UA 1561 to San Diego leaves the gatealso AC 4192, AZ 4504, EK 6380, VA 8231, LH 9202, NZ 9644
19 h 10 apart on the timetable, overnight
UA 1561 leaves 19 h 10 after UA 1970 arrives on the timetable: more than half a day, so not a connection we count.