Flights in and out of the airport were cancelled with frustrated passengers from the other Highlands Provinces left stranded.
Air Niugini Public Relations confirmed the suspension of its afternoon flight, and said an official statement will be released once approved by the CEO.
A passenger who travelled from neighbouring Southern Highlands Province, Brian Waffi said it was frustrating because he did not plan to spend a night in Mt Hagen.
He said all the candidates and their supporters are sitting on the tarmac and protesting.
