Cathay Pacific currently is the only airlines that fly Hong Kong-Adelaide 4Weekly non-stop services... Schedule is as follow:
CX105 Hong Kong-Adelaide 2340-1050 Su/Tu/Th/Sa A333
Return:
CX104 Adelaide-Hong Kong 1205-2150 Su/Mo/We/Fr A333
ps. Cathay Pacific operate the route as Hong Kong-Adelaide-Melbourne-Hong Kong so that non-stop services only apply on Hong Kong-Adelaide while the flight will fly via Melbourne on the return trip to Hong Kong.