OZ 6344 then UA 1780 at San Francisco
St Louis → San Francisco → Ontario
Timetable, San Francisco time
21:41OZ 6344 from St Louis at the gate
18:50UA 1780 to Ontario leaves the gatealso AC 4423, AC 4548
21 h 09 apart on the timetable, overnight
UA 1780 leaves 21 h 09 after OZ 6344 arrives on the timetable: more than half a day, so not a connection we count.