F9 2350 then UA 1561 at Denver
Las Vegas → Denver → San Francisco
Timetable, Denver time
14:41F9 2350 from Las Vegas at the gate
11:20UA 1561 to San Francisco leaves the gate
20 h 39 apart on the timetable, overnight
UA 1561 leaves 20 h 39 after F9 2350 arrives on the timetable: more than half a day, so not a connection we count.