UA 589 then UA 581 at San Francisco
Houston → San Francisco → Cleveland
Timetable, San Francisco time
17:10UA 589 from Houston at the gatealso VA 8069, NZ 9207
12:45UA 581 to Cleveland leaves the gate
19 h 35 apart on the timetable, overnight
UA 581 leaves 19 h 35 after UA 589 arrives on the timetable: more than half a day, so not a connection we count.