WN 757 then UA 5886 at Denver
Cleveland → Denver → Springfield
Timetable, Denver time
18:45WN 757 from Cleveland at the gate
17:53UA 5886 to Springfield leaves the gate
23 h 08 apart on the timetable, overnight
UA 5886 leaves 23 h 08 after WN 757 arrives on the timetable: more than half a day, so not a connection we count.