EU 6677 then CZ 3516 at Pudong
Chengdu → Shanghai → Haikou
Timetable, Shanghai time
20:00EU 6677 from Chengdu at the gate
12:25CZ 3516 to Haikou leaves the gate
16 h 25 apart on the timetable, overnight
CZ 3516 leaves 16 h 25 after EU 6677 arrives on the timetable: more than half a day, so not a connection we count.