UA 567 then WN 1749 at Denver
Des Moines → Denver → Dallas
Timetable, Denver time
10:15UA 567 from Des Moines at the gate
06:05WN 1749 to Dallas leaves the gate
19 h 50 apart on the timetable, overnight
WN 1749 leaves 19 h 50 after UA 567 arrives on the timetable: more than half a day, so not a connection we count.