UA 751 then UA 2831 at San Francisco
Portland (Oregon) → San Francisco → Houston
Timetable, San Francisco time
15:15UA 751 from Portland (Oregon) at the gatealso CM 1419, AC 3338, VA 8585, NZ 9358
14:30UA 2831 to Houston leaves the gate
23 h 15 apart on the timetable, overnight
UA 2831 leaves 23 h 15 after UA 751 arrives on the timetable: more than half a day, so not a connection we count.