CA 8443 then UA 4518 at O'Hare
Anchorage → Chicago → St Louis
Timetable, Chicago time
16:59CA 8443 from Anchorage at the gate
16:35UA 4518 to St Louis leaves the gate
23 h 36 apart on the timetable, overnight
UA 4518 leaves 23 h 36 after CA 8443 arrives on the timetable: more than half a day, so not a connection we count.