UA 499 then AV 2354 at San Francisco
Seattle → San Francisco → Denver
Timetable, San Francisco time
09:19UA 499 from Seattle at the gatealso AZ 4458, OZ 6301, CA 7305, NH 7327, VA 8293, NZ 9423
05:00AV 2354 to Denver leaves the gate
19 h 41 apart on the timetable, overnight
AV 2354 leaves 19 h 41 after UA 499 arrives on the timetable: more than half a day, so not a connection we count.