UA 4551 then K4 532 at O'Hare
Sioux Falls → Chicago → Seoul
Timetable, Chicago time
07:55UA 4551 from Sioux Falls at the gate
06:30K4 532 to Seoul leaves the gate
22 h 35 apart on the timetable, overnight
K4 532 leaves 22 h 35 after UA 4551 arrives on the timetable: more than half a day, so not a connection we count.