Air New Zealand is suspending services between Auckland and Vanuatu over concerns about the state of the runway at Port Vila International Airport.

General Manager Flight Operations Stephen Hunt said the runway has been gradually deteriorating.

He said they've decided to suspend services before the situation becomes unsafe.

The airline will operate one more return service between Auckland and Vanuatu tomorrow for customers who are completing a return journey

Air New Zealand said all customers will have the option of changing their booking to another Pacific or Tasman destination or receiving a full refund.