F9 2225 then UA 2123 at Denver
Raleigh-Durham → Denver → San Francisco
Timetable, Denver time
21:47F9 2225 from Raleigh-Durham at the gate
21:18UA 2123 to San Francisco leaves the gate
23 h 31 apart on the timetable, overnight
UA 2123 leaves 23 h 31 after F9 2225 arrives on the timetable: more than half a day, so not a connection we count.