F9 4567 then UA 1913 at Denver
St Louis → Denver → Pasco
Timetable, Denver time
21:30F9 4567 from St Louis at the gate
19:20UA 1913 to Pasco leaves the gate
21 h 50 apart on the timetable, overnight
UA 1913 leaves 21 h 50 after F9 4567 arrives on the timetable: more than half a day, so not a connection we count.