F9 4567 then UA 1092 at Denver
St Louis → Denver → Missoula
Timetable, Denver time
21:30F9 4567 from St Louis at the gate
19:30UA 1092 to Missoula leaves the gate
22 h apart on the timetable, overnight
UA 1092 leaves 22 h after F9 4567 arrives on the timetable: more than half a day, so not a connection we count.