Travel to Portugal
All passengers need to fill out a Passenger Locator Card before departure to Portugal.
From 1 December 2021, passengers arriving into Portugal by air must hold a negative Covid-19 test result even if they are fully vaccinated. The following tests are accepted:
PCR (NAAT) tests taken within 72 hours of departure
Rapid Antigen tests taken within 48 hours of departure. Only Rapid Antigen Tests that are on the list agreed by the European Union Health Committee are allowed.
The following passenger categories are exempt from this negative rest result requirement:
Holders of a valid EU Digital Covid Certificate of recovery from Covid-19 (issued less than 180 days before travel)
Children under the age of 12
Essential workers (defined by Portugal as workers in transport, emergency and security services)
Cross-border workers (working within 30 km of Portugal’s border)
If you’re travelling to Portugal, our up-to-date travel advice gives you practical tips on emergency contacts, security, climate and other essential information.
www.dfa.ie
Requirements for EU citizens but I'd imagine it's pretty much universal.