UA 1970 then UA 1791 at San Francisco
Cleveland → San Francisco → Washington
Timetable, San Francisco time
21:45UA 1970 from Cleveland at the gatealso VA 8489, NZ 9046, OZ 9526
13:50UA 1791 to Washington leaves the gatealso CA 7314, LH 7489, NZ 9163
16 h 05 apart on the timetable, overnight
UA 1791 leaves 16 h 05 after UA 1970 arrives on the timetable: more than half a day, so not a connection we count.