UA 281 then WN 197 at Denver
Houston → Denver → Dallas
Timetable, Denver time
11:22UA 281 from Houston at the gate
11:05WN 197 to Dallas leaves the gate
23 h 43 apart on the timetable, overnight
WN 197 leaves 23 h 43 after UA 281 arrives on the timetable: more than half a day, so not a connection we count.