UA 2375 then WN 406 at Denver
Portland (Oregon) → Denver → Las Vegas
Timetable, Denver time
12:30UA 2375 from Portland (Oregon) at the gate
12:05WN 406 to Las Vegas leaves the gate
23 h 35 apart on the timetable, overnight
WN 406 leaves 23 h 35 after UA 2375 arrives on the timetable: more than half a day, so not a connection we count.