UA 3871 then UA 6161 at Houston
IAB → Houston → San Antonio
Timetable, Houston time
10:55UA 3871 from IAB at the gate
16:55UA 6161 to San Antonio leaves the gate
6 h apart on the timetable
The last days
UA 3871 and UA 6161 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.