UA 677 then AV 2354 at San Francisco
Seattle → San Francisco → Denver
Timetable, San Francisco time
19:38UA 677 from Seattle at the gate
16:24AV 2354 to Denver leaves the gate
20 h 46 apart on the timetable, overnight
AV 2354 leaves 20 h 46 after UA 677 arrives on the timetable: more than half a day, so not a connection we count.