K4 537 then UA 4576 at O'Hare
Anchorage → Chicago → St Louis
Timetable, Chicago time
23:39K4 537 from Anchorage at the gate
22:00UA 4576 to St Louis leaves the gate
22 h 21 apart on the timetable, overnight
UA 4576 leaves 22 h 21 after K4 537 arrives on the timetable: more than half a day, so not a connection we count.