EK 6303 then UA 581 at San Francisco
Chicago O'Hare → San Francisco → Cleveland
Timetable, San Francisco time
13:30EK 6303 from Chicago O'Hare at the gate
12:45UA 581 to Cleveland leaves the gate
23 h 15 apart on the timetable, overnight
UA 581 leaves 23 h 15 after EK 6303 arrives on the timetable: more than half a day, so not a connection we count.