UA 455 then WN 149 at Phoenix
Chicago O'Hare → Phoenix → Las Vegas
Timetable, Phoenix time
15:57UA 455 from Chicago O'Hare at the gate
08:35WN 149 to Las Vegas leaves the gate
16 h 38 apart on the timetable, overnight
WN 149 leaves 16 h 38 after UA 455 arrives on the timetable: more than half a day, so not a connection we count.