UA 3913 then AV 425 at Houston
Denver → Houston → Santa Clara
Timetable, Houston time
21:22UA 3913 from Denver at the gate
16:45AV 425 to Santa Clara leaves the gate
19 h 23 apart on the timetable, overnight
AV 425 leaves 19 h 23 after UA 3913 arrives on the timetable: more than half a day, so not a connection we count.