UA 3913 then DL 1532 at Houston
Denver → Houston → Salt Lake City
Timetable, Houston time
21:22UA 3913 from Denver at the gate
14:24DL 1532 to Salt Lake City leaves the gate
17 h 02 apart on the timetable, overnight
DL 1532 leaves 17 h 02 after UA 3913 arrives on the timetable: more than half a day, so not a connection we count.