UA 1970 then UA 2279 at San Francisco
Cleveland → San Francisco → Seattle
Timetable, San Francisco time
21:45UA 1970 from Cleveland at the gatealso VA 8489, NZ 9046, OZ 9526
16:17UA 2279 to Seattle leaves the gatealso AZ 4506, VA 8282, NZ 9406
18 h 32 apart on the timetable, overnight
UA 2279 leaves 18 h 32 after UA 1970 arrives on the timetable: more than half a day, so not a connection we count.