9C 8792 then EU 6678 at Pudong
Sapporo → Shanghai → Chengdu
Timetable, Shanghai time
17:009C 8792 from Sapporo at the gate
12:55EU 6678 to Chengdu leaves the gate
19 h 55 apart on the timetable, overnight
EU 6678 leaves 19 h 55 after 9C 8792 arrives on the timetable: more than half a day, so not a connection we count.