UA 751 then VA 8079 at San Francisco
Portland (Oregon) → San Francisco → Houston
Timetable, San Francisco time
15:15UA 751 from Portland (Oregon) at the gatealso CM 1419
12:00VA 8079 to Houston leaves the gatealso NZ 9195
20 h 45 apart on the timetable, overnight
VA 8079 leaves 20 h 45 after UA 751 arrives on the timetable: more than half a day, so not a connection we count.