UA 3910 then UA 341 at Houston
Washington → Houston → San Antonio
Timetable, Houston time
14:30UA 3910 from Washington at the gate
12:05UA 341 to San Antonio leaves the gate
21 h 35 apart on the timetable, overnight
UA 341 leaves 21 h 35 after UA 3910 arrives on the timetable: more than half a day, so not a connection we count.