WN 2952 then UA 421 at Denver
Los Angeles → Denver → Washington
Timetable, Denver time
22:10WN 2952 from Los Angeles at the gate
16:10UA 421 to Washington leaves the gate
18 h apart on the timetable, overnight
UA 421 leaves 18 h after WN 2952 arrives on the timetable: more than half a day, so not a connection we count.