OZ 6344 then UA 2418 at San Francisco
St Louis → San Francisco → Redmond
Timetable, San Francisco time
21:41OZ 6344 from St Louis at the gate
16:40UA 2418 to Redmond leaves the gate
18 h 59 apart on the timetable, overnight
UA 2418 leaves 18 h 59 after OZ 6344 arrives on the timetable: more than half a day, so not a connection we count.