WN 287 then UA 581 at San Francisco
Los Angeles → San Francisco → Cleveland
Timetable, San Francisco time
18:25WN 287 from Los Angeles at the gate
12:45UA 581 to Cleveland leaves the gate
18 h 20 apart on the timetable, overnight
UA 581 leaves 18 h 20 after WN 287 arrives on the timetable: more than half a day, so not a connection we count.