UA 3913 then UA 341 at Houston
Denver → Houston → San Antonio
Timetable, Houston time
21:22UA 3913 from Denver at the gate
12:05UA 341 to San Antonio leaves the gate
14 h 43 apart on the timetable, overnight
UA 341 leaves 14 h 43 after UA 3913 arrives on the timetable: more than half a day, so not a connection we count.