UA 1970 then UA 1230 at San Francisco
Cleveland → San Francisco → Denver
Timetable, San Francisco time
21:45UA 1970 from Cleveland at the gatealso VA 8489, NZ 9046, OZ 9526
14:24UA 1230 to Denver leaves the gatealso AC 5070, CA 7308, NH 7320, VA 8339, NZ 9050
16 h 39 apart on the timetable, overnight
UA 1230 leaves 16 h 39 after UA 1970 arrives on the timetable: more than half a day, so not a connection we count.