The cheapest month to fly to Medan from New Zealand is in August. Flight prices, which tend to average around $823, are often lower during this time because this is during the off-season. If you aren’t able to travel to Medan during the month of August, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $876.
Those flying to Medan could potentially find better pricing at Siborong-Borong Silangit Airport (152 km from Medan city centre), depending on the month and departure airport.