UA 28 then VA 8085 at San Francisco
Singapore → San Francisco → Houston
Timetable, San Francisco time
21:15UA 28 from Singapore at the gate
16:40VA 8085 to Houston leaves the gate
19 h 25 apart on the timetable, overnight
VA 8085 leaves 19 h 25 after UA 28 arrives on the timetable: more than half a day, so not a connection we count.