CV 251 then UA 4613 at O'Hare
Anchorage → Chicago → St Louis
Timetable, Chicago time
19:00CV 251 from Anchorage at the gate
07:27UA 4613 to St Louis leaves the gate
12 h 27 apart on the timetable, overnight
UA 4613 leaves 12 h 27 after CV 251 arrives on the timetable: more than half a day, so not a connection we count.