WN 209 then WN 2170 at Denver
St Louis → Denver → St Louis
Timetable, Denver time
18:50WN 209 from St Louis at the gate
14:20WN 2170 to St Louis leaves the gate
19 h 30 apart on the timetable, overnight
WN 2170 leaves 19 h 30 after WN 209 arrives on the timetable: more than half a day, so not a connection we count.