UA 1264 then DL 1421 at San Francisco
Las Vegas → San Francisco → Los Angeles
Timetable, San Francisco time
11:32UA 1264 from Las Vegas at the gatealso AC 3714, AZ 4443, NZ 9240, LH 9415
09:54DL 1421 to Los Angeles leaves the gatealso KL 6896, LA 8934, LA 8950
22 h 22 apart on the timetable, overnight
DL 1421 leaves 22 h 22 after UA 1264 arrives on the timetable: more than half a day, so not a connection we count.