UA 1341 then UA 8187 at San Francisco
Detroit → San Francisco → Washington National
Timetable, San Francisco time
19:31UA 1341 from Detroit at the gatealso OZ 9538
15:23UA 8187 to Washington National leaves the gate
19 h 52 apart on the timetable, overnight
UA 8187 leaves 19 h 52 after UA 1341 arrives on the timetable: more than half a day, so not a connection we count.