F9 4567 then UA 5111 at Denver
St Louis → Denver → Pierre
Timetable, Denver time
21:30F9 4567 from St Louis at the gate
21:10UA 5111 to Pierre leaves the gate
23 h 40 apart on the timetable, overnight
UA 5111 leaves 23 h 40 after F9 4567 arrives on the timetable: more than half a day, so not a connection we count.