UA 4173 then K4 538 at O'Hare
Richmond → Chicago → Seoul
Timetable, Chicago time
13:29UA 4173 from Richmond at the gate
01:45K4 538 to Seoul leaves the gate
12 h 16 apart on the timetable, overnight
K4 538 leaves 12 h 16 after UA 4173 arrives on the timetable: more than half a day, so not a connection we count.