Visitors only need to show a negative PCR or cheaper antigen/lateral flow test on entry.
 
Visitors aged 12 or above must show they took their PCR test up to 72 hours before departing for Portugal, or took an antigen test up to 48 hours before departing. Children 11 or under do not need to show test proof or be vaccinated. 
 
PCR or antigen test certificates must show the ID or passport number for the visitor plus details of the issuing authority and authentication number. 

Visit Portugal said airlines would only allow passengers to board flights once they present the test proof to check-in staff. 
 
These measures also apply to passengers embarking and disembarking cruise ships on the Portuguese mainland. 
 
The changes apply immediately “and are currently in effect until 16th September 2021”.

“They may be revised at any time depending on scientific or medical changes relating to Covid-19,” Visit Portugal said.