UA 2012 then WN 1844 at Denver
Baltimore → Denver → St Louis
Timetable, Denver time
18:25UA 2012 from Baltimore at the gate
18:05WN 1844 to St Louis leaves the gate
23 h 40 apart on the timetable, overnight
WN 1844 leaves 23 h 40 after UA 2012 arrives on the timetable: more than half a day, so not a connection we count.