Helsinki Airport has a Covid-19 testing point organised by the City of Vantaa. Test is available for all passengers arriving in Finland. The test is free of charge. The testing point is located in the gate area, so if you wish to be tested, please proceed to the test area before continuing to baggage claim.
Detailed information on requirements for testing as well as vaccination and test certificates can be found on THL's website.
At other Finavia airports, contact information for the local health authorities is provided in brochures distributed at the airport terminals.