I am travelling to Hong Kong, Malaysia and Singapore in June/July with family for two weeks. After going through various flight booking websites, the cheapest price I got is $3984 [$4025 after fee and other charges] for 5 of us [Three adults and two kids] with Cathay Pacific.
Flight Schedule is:
Melbourne - Hong Kong
Hong Kong - Malaysia
Malaysia - Melbourne
Also looking for hotel to stay at near Disneyland in HK.
$800 each is reasonable for flights