UA 2230 then K4 538 at O'Hare
Miami → Chicago → Seoul
Timetable, Chicago time
09:30UA 2230 from Miami at the gate
01:45K4 538 to Seoul leaves the gate
16 h 15 apart on the timetable, overnight
K4 538 leaves 16 h 15 after UA 2230 arrives on the timetable: more than half a day, so not a connection we count.