BA 2954 then UA 785 at San Francisco
Las Vegas → San Francisco → Washington
Timetable, San Francisco time
12:16BA 2954 from Las Vegas at the gate
06:15UA 785 to Washington leaves the gatealso AZ 4408, NZ 9160
17 h 59 apart on the timetable, overnight
UA 785 leaves 17 h 59 after BA 2954 arrives on the timetable: more than half a day, so not a connection we count.