UA 3487 then K4 532 at O'Hare
Columbus (Ohio) → Chicago → Seoul
Timetable, Chicago time
09:45UA 3487 from Columbus (Ohio) at the gate
06:30K4 532 to Seoul leaves the gate
20 h 45 apart on the timetable, overnight
K4 532 leaves 20 h 45 after UA 3487 arrives on the timetable: more than half a day, so not a connection we count.