UA 1909 then UA 406 at San Francisco
San Luis Obispo → San Francisco → Las Vegas
Timetable, San Francisco time
09:06UA 1909 from San Luis Obispo at the gatealso LH 8577
21:10UA 406 to Las Vegas leaves the gatealso AC 4025, VA 8562, LH 8940, NZ 9229
12 h 04 apart on the timetable
UA 406 leaves 12 h 04 after UA 1909 arrives on the timetable: more than half a day, so not a connection we count.