TK 9588 then UA 581 at San Francisco
Portland (Oregon) → San Francisco → Cleveland
Timetable, San Francisco time
15:15TK 9588 from Portland (Oregon) at the gate
12:45UA 581 to Cleveland leaves the gate
21 h 30 apart on the timetable, overnight
UA 581 leaves 21 h 30 after TK 9588 arrives on the timetable: more than half a day, so not a connection we count.