CX 80 then UA 4518 at O'Hare
Anchorage → Chicago → St Louis
Timetable, Chicago time
17:00CX 80 from Anchorage at the gate
16:35UA 4518 to St Louis leaves the gate
23 h 35 apart on the timetable, overnight
UA 4518 leaves 23 h 35 after CX 80 arrives on the timetable: more than half a day, so not a connection we count.