F9 4567 then UA 1483 at Denver
St Louis → Denver → Montrose
Timetable, Denver time
21:30F9 4567 from St Louis at the gate
19:25UA 1483 to Montrose leaves the gate
21 h 55 apart on the timetable, overnight
UA 1483 leaves 21 h 55 after F9 4567 arrives on the timetable: more than half a day, so not a connection we count.