copy from
Practical Guide For Employment of foreign domestic helpers – What foreign domestic helpers and their employers should know
http://www.labour.gov.hk/eng/public/wcp/FDHguide.pdf
Q10.1 Is my employer responsible for paying my passage back to my place of
origin upon termination or expiry of the contract?
A Yes. Upon termination or expiry of the contract, your employer should
provide free passage, usually an air ticket covering airport tax for you to return
to your place of origin, and a daily food and travelling allowance of HK$100
per day.