The Ministry of Health announced the change today, as community transmission of Covid-19 is climbing quickly in Samoa.
Samoa discovered its first case of community transmission on Thursday.
Travellers arriving on four specific flights over the coming weeks will be required to undergo two rapid antigen tests - the first within 36 hours of arriving, and the second on day five/six.
They will be issued with testing kits on arrival and the results must be reported either by an automated email survey or by calling 0800 432 010.
The four flights are: