UA 499 then OZ 6315 at San Francisco
Seattle → San Francisco → Washington
Timetable, San Francisco time
09:19UA 499 from Seattle at the gatealso AZ 4458, OZ 6301, CA 7305
21:28OZ 6315 to Washington leaves the gate
12 h 09 apart on the timetable
OZ 6315 leaves 12 h 09 after UA 499 arrives on the timetable: more than half a day, so not a connection we count.