F9 4346 then UA 421 at Denver
Los Angeles → Denver → Washington
Timetable, Denver time
17:35F9 4346 from Los Angeles at the gate
16:10UA 421 to Washington leaves the gate
22 h 35 apart on the timetable, overnight
UA 421 leaves 22 h 35 after F9 4346 arrives on the timetable: more than half a day, so not a connection we count.