AS 634 then UA 1453 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
16:52UA 1453 to Washington leaves the gatealso VA 8383, NZ 9169
23 h 11 apart on the timetable, overnight
UA 1453 leaves 23 h 11 after AS 634 arrives on the timetable: more than half a day, so not a connection we count.