BA 287 then UA 552 at San Francisco
London → San Francisco → Redmond
Timetable, San Francisco time
18:45BA 287 from London at the gatealso IB 3628, AS 5277, AY 5527, AA 6998, EI 8987
16:20UA 552 to Redmond leaves the gate
21 h 35 apart on the timetable, overnight
UA 552 leaves 21 h 35 after BA 287 arrives on the timetable: more than half a day, so not a connection we count.