UA 5134 then UA 421 at Denver
Prescott → Denver → Washington
Timetable, Denver time
19:29UA 5134 from Prescott at the gate
16:10UA 421 to Washington leaves the gate
20 h 41 apart on the timetable, overnight
UA 421 leaves 20 h 41 after UA 5134 arrives on the timetable: more than half a day, so not a connection we count.