QR 8564 then K4 602 at O'Hare
Las Vegas → Chicago → Seoul
Timetable, Chicago time
04:21QR 8564 from Las Vegas at the gate
04:00K4 602 to Seoul leaves the gate
23 h 39 apart on the timetable, overnight
K4 602 leaves 23 h 39 after QR 8564 arrives on the timetable: more than half a day, so not a connection we count.