EU 6677 then CZ 6686 at Pudong
Chengdu → Shanghai → Haikou
Timetable, Shanghai time
20:00EU 6677 from Chengdu at the gate
16:10CZ 6686 to Haikou leaves the gate
20 h 10 apart on the timetable, overnight
CZ 6686 leaves 20 h 10 after EU 6677 arrives on the timetable: more than half a day, so not a connection we count.