UA 472 then WN 1749 at Denver
Memphis → Denver → Dallas
Timetable, Denver time
10:18UA 472 from Memphis at the gate
05:35WN 1749 to Dallas leaves the gate
19 h 17 apart on the timetable, overnight
WN 1749 leaves 19 h 17 after UA 472 arrives on the timetable: more than half a day, so not a connection we count.