UA 3913 then UA 4049 at Houston
Denver → Houston → El Paso
Timetable, Houston time
21:22UA 3913 from Denver at the gate
12:14UA 4049 to El Paso leaves the gate
14 h 52 apart on the timetable, overnight
UA 4049 leaves 14 h 52 after UA 3913 arrives on the timetable: more than half a day, so not a connection we count.