UA 367 then UA 1646 at San Francisco
Washington → San Francisco → Baltimore
Timetable, San Francisco time
01:29UA 367 from Washington at the gatealso LH 7530, VA 8388, NZ 9181
21:30UA 1646 to Baltimore leaves the gatealso NZ 9032
20 h 01 apart on the timetable
UA 1646 leaves 20 h 01 after UA 367 arrives on the timetable: more than half a day, so not a connection we count.