AV 2351 then UA 2168 at San Francisco
Denver → San Francisco → Houston
Timetable, San Francisco time
11:42AV 2351 from Denver at the gate
05:00UA 2168 to Houston leaves the gatealso VA 8084, NZ 9198
17 h 18 apart on the timetable, overnight
UA 2168 leaves 17 h 18 after AV 2351 arrives on the timetable: more than half a day, so not a connection we count.