All Covid-19 travel restrictions have now been removed.
Proof of vaccination is no longer required.
Pre-departure Covid-19 testing is no longer required.
Covid-19 tests on arrival in Port Moresby are no longer required.
On arrival passengers can proceed directly to immigration.
For international travel out of PNG:
As requirements are constantly changing, it is the traveller's responsibility to comply with their home destination and their transit requirements. Some countries still require testing / proof of vaccination.