The move is part of the latest changes to the nation's pandemic response and includes a lifting of the daily curfew in the capital Port Moresby.
Pandemic response controller, David Manning, said international flights are now open to Singapore, Hong Kong, Japan and Solomon Islands which are in addition to Australia which already has access.
Manning said passengers are still required to get approval from his office to travel to the country and must be able to show a negative test result for Covid-19 before being allowed on a flight.
