When return travel matters
ICA does not apply one identical return-ticket rule to every visa class
Current ICA guidance clearly requires evidence of return or onward travel for several business and specialist visa classes. The Short-Term Single-Entry Business Visa, Short-Term Multiple-Entry Business Visa and Restricted Employment Visa all list return/onward travel as part of the application evidence.
For visitors, ICA's current Visitor page focuses on proving that you are a genuine visitor who intends to leave Papua New Guinea at the end of the stay and says additional evidence may be requested depending on the circumstances. Older ICA visitor guidance also expressly listed a confirmed onward or return itinerary for 60-day visitor applications.