F9 4567 then UA 1729 at Denver
St Louis → Denver → Phoenix Sky Harbor
Timetable, Denver time
21:30F9 4567 from St Louis at the gate
19:35UA 1729 to Phoenix Sky Harbor leaves the gate
22 h 05 apart on the timetable, overnight
UA 1729 leaves 22 h 05 after F9 4567 arrives on the timetable: more than half a day, so not a connection we count.