UA 1970 then UA 1531 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
21:28UA 1531 to Washington leaves the gatealso CA 7312
23 h 43 apart on the timetable, overnight
UA 1531 leaves 23 h 43 after UA 1970 arrives on the timetable: more than half a day, so not a connection we count.