UA 3479 then K4 538 at O'Hare
Indianapolis → Chicago → Seoul
Timetable, Chicago time
06:20UA 3479 from Indianapolis at the gate
01:45K4 538 to Seoul leaves the gate
19 h 25 apart on the timetable, overnight
K4 538 leaves 19 h 25 after UA 3479 arrives on the timetable: more than half a day, so not a connection we count.