WN 209 then UA 5886 at Denver
St Louis → Denver → Springfield
Timetable, Denver time
18:50WN 209 from St Louis at the gate
17:53UA 5886 to Springfield leaves the gate
23 h 03 apart on the timetable, overnight
UA 5886 leaves 23 h 03 after WN 209 arrives on the timetable: more than half a day, so not a connection we count.