UA 677 then UA 552 at San Francisco
Seattle → San Francisco → Redmond
Timetable, San Francisco time
19:38UA 677 from Seattle at the gate
16:40UA 552 to Redmond leaves the gate
21 h 02 apart on the timetable, overnight
UA 552 leaves 21 h 02 after UA 677 arrives on the timetable: more than half a day, so not a connection we count.