UA 593 then UA 3917 at Houston
San Antonio → Houston → Austin
Timetable, Houston time
10:42UA 593 from San Antonio at the gate
07:30UA 3917 to Austin leaves the gate
20 h 48 apart on the timetable, overnight
UA 3917 leaves 20 h 48 after UA 593 arrives on the timetable: more than half a day, so not a connection we count.