K4 579 then UA 4438 at O'Hare
Fairbanks → Chicago → St Louis
Timetable, Chicago time
16:23K4 579 from Fairbanks at the gate
10:45UA 4438 to St Louis leaves the gate
18 h 22 apart on the timetable, overnight
UA 4438 leaves 18 h 22 after K4 579 arrives on the timetable: more than half a day, so not a connection we count.