UA 3501 then UA 4613 at O'Hare
Kansas City → Chicago → St Louis
Timetable, Chicago time
17:05UA 3501 from Kansas City at the gate
07:27UA 4613 to St Louis leaves the gate
14 h 22 apart on the timetable, overnight
UA 4613 leaves 14 h 22 after UA 3501 arrives on the timetable: more than half a day, so not a connection we count.