UA 3875 then WN 3846 at San Francisco
IAB → San Francisco → Las Vegas
Timetable, San Francisco time
01:46UA 3875 from IAB at the gate
21:00WN 3846 to Las Vegas leaves the gate
19 h 14 apart on the timetable
WN 3846 leaves 19 h 14 after UA 3875 arrives on the timetable: more than half a day, so not a connection we count.