OZ 6344 then UA 2386 at San Francisco
St Louis → San Francisco → Washington National
Timetable, San Francisco time
21:41OZ 6344 from St Louis at the gate
14:18UA 2386 to Washington National leaves the gatealso NZ 2777
16 h 37 apart on the timetable, overnight
UA 2386 leaves 16 h 37 after OZ 6344 arrives on the timetable: more than half a day, so not a connection we count.