When to submit
The official 72-hour window and the newer boarding rule
ICA's PNGDAC guidance says travellers can submit the digital arrival card within 72 hours before and including the day of arrival in Papua New Guinea. The ICA homepage likewise describes submission as available up to 72 hours before arrival.
A later official notice dated 6 August 2026 adds an important operational rule: international airlines, ground handling agents and check-in personnel are instructed that travellers must complete the PNGDAC before a boarding pass is issued.