UA 737 then UA 581 at San Francisco
Seattle → San Francisco → Cleveland
Timetable, San Francisco time
12:59UA 737 from Seattle at the gate
12:45UA 581 to Cleveland leaves the gate
23 h 46 apart on the timetable, overnight
UA 581 leaves 23 h 46 after UA 737 arrives on the timetable: more than half a day, so not a connection we count.