The International Airport in Port Moresby is set to be upgraded with an estimated cost of half a billion US dollars to allow an increase in passengers.
Construction is set to begin mid next year and is expected to take about 18 months.
The National Airport Corporation managing director, Joseph Kintau, expects the demand for international flights will increase due to the huge LNG gas project.
Mr Kintau says the current demand is already putting a strain on the existing facilities.
"The current facility was built in 1989 and it was built on assumption of about 300 000 passengers a year. This has now grown to about 1.2 or 1.4 million and we're forecasting due to economic growth that that would grow to about twice that much and the current facilities cannot cater for that."
Joseph Kintau says they are planning to extend the runway, develop the taxi ways, and build a new terminal.