Samoa's Director General of Health Dr Take Naseri confirmed the cases, which include an 11 month old baby, during a press conference this afternoon in Apia.
The passengers were on a flight from Brisbane carrying 73 people.
All are fully vaccinated and had tested negative for Covid-19 before departure.
Dr Take Naseri said all of the passengers who tested positive since arriving in Samoa have been put into isolation and all are asymptomatic.