F9 3242 then UA 3376 at O'Hare
Dallas-Fort Worth → Chicago → St Louis
Timetable, Chicago time
19:15F9 3242 from Dallas-Fort Worth at the gate
11:00UA 3376 to St Louis leaves the gate
15 h 45 apart on the timetable, overnight
UA 3376 leaves 15 h 45 after F9 3242 arrives on the timetable: more than half a day, so not a connection we count.