UA 5402 then UA 8178 at San Francisco
Seattle → San Francisco → Los Angeles
Timetable, San Francisco time
23:00UA 5402 from Seattle at the gatealso NZ 9422
22:50UA 8178 to Los Angeles leaves the gate
23 h 50 apart on the timetable, overnight
UA 8178 leaves 23 h 50 after UA 5402 arrives on the timetable: more than half a day, so not a connection we count.