UA 403 then UA 3376 at O'Hare
Fort Lauderdale → Chicago → St Louis
Timetable, Chicago time
19:30UA 403 from Fort Lauderdale at the gate
11:00UA 3376 to St Louis leaves the gate
15 h 30 apart on the timetable, overnight
UA 3376 leaves 15 h 30 after UA 403 arrives on the timetable: more than half a day, so not a connection we count.