UA 751 then UA 1387 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
12:00UA 1387 to Houston leaves the gatealso EK 6417, NZ 9195
20 h 45 apart on the timetable, overnight
UA 1387 leaves 20 h 45 after UA 751 arrives on the timetable: more than half a day, so not a connection we count.