WN 757 then UA 248 at Denver
Cleveland → Denver → Omaha
Timetable, Denver time
18:45WN 757 from Cleveland at the gate
17:59UA 248 to Omaha leaves the gate
23 h 14 apart on the timetable, overnight
UA 248 leaves 23 h 14 after WN 757 arrives on the timetable: more than half a day, so not a connection we count.