F9 4567 then WN 1600 at Denver
St Louis → Denver → Houston Hobby
Timetable, Denver time
21:30F9 4567 from St Louis at the gate
18:45WN 1600 to Houston Hobby leaves the gate
21 h 15 apart on the timetable, overnight
WN 1600 leaves 21 h 15 after F9 4567 arrives on the timetable: more than half a day, so not a connection we count.