UA 459 then WN 1749 at Denver
Portland (Oregon) → Denver → Dallas
Timetable, Denver time
08:30UA 459 from Portland (Oregon) at the gate
05:35WN 1749 to Dallas leaves the gate
21 h 05 apart on the timetable, overnight
WN 1749 leaves 21 h 05 after UA 459 arrives on the timetable: more than half a day, so not a connection we count.