UA 2391 then UA 545 at San Francisco
Denver → San Francisco → Austin
Timetable, San Francisco time
09:29UA 2391 from Denver at the gatealso AC 3600, CA 7229, NH 7311, VA 8347, NZ 9066
08:40UA 545 to Austin leaves the gatealso AC 5289, VA 8467
23 h 11 apart on the timetable, overnight
UA 545 leaves 23 h 11 after UA 2391 arrives on the timetable: more than half a day, so not a connection we count.