F9 4567 then UA 2323 at Denver
St Louis → Denver → San Luis Obispo
Timetable, Denver time
21:30F9 4567 from St Louis at the gate
19:20UA 2323 to San Luis Obispo leaves the gate
21 h 50 apart on the timetable, overnight
UA 2323 leaves 21 h 50 after F9 4567 arrives on the timetable: more than half a day, so not a connection we count.