VA 8355 then UA 3912 at San Francisco
Denver → San Francisco → Houston
Timetable, San Francisco time
06:48VA 8355 from Denver at the gate
23:00UA 3912 to Houston leaves the gate
16 h 12 apart on the timetable
UA 3912 leaves 16 h 12 after VA 8355 arrives on the timetable: more than half a day, so not a connection we count.