AS 634 then UA 755 at San Francisco
Las Vegas → San Francisco → Washington
Timetable, San Francisco time
17:41AS 634 from Las Vegas at the gatealso QF 3697, FJ 5841, AA 7412, CX 7935, QR 8861
12:45UA 755 to Washington leaves the gatealso CA 7313, NZ 9162
19 h 04 apart on the timetable, overnight
UA 755 leaves 19 h 04 after AS 634 arrives on the timetable: more than half a day, so not a connection we count.