UA 1591 then AS 718 at San Francisco
San Antonio → San Francisco → Las Vegas
Timetable, San Francisco time
11:02UA 1591 from San Antonio at the gatealso NZ 2372, UA 2490, AC 4201, EK 6003
10:00AS 718 to Las Vegas leaves the gatealso QR 2140, QR 2176, CX 7932, AA 9434
22 h 58 apart on the timetable, overnight
AS 718 leaves 22 h 58 after UA 1591 arrives on the timetable: more than half a day, so not a connection we count.