F9 4567 then WN 580 at Denver
St Louis → Denver → San Antonio
Timetable, Denver time
21:30F9 4567 from St Louis at the gate
19:15WN 580 to San Antonio leaves the gate
21 h 45 apart on the timetable, overnight
WN 580 leaves 21 h 45 after F9 4567 arrives on the timetable: more than half a day, so not a connection we count.