UA 3902 then UA 2250 at Houston
Toronto → Houston → San Antonio
Timetable, Houston time
08:27UA 3902 from Toronto at the gate
07:20UA 2250 to San Antonio leaves the gate
22 h 53 apart on the timetable, overnight
UA 2250 leaves 22 h 53 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.