Air NZ chief executive Nikhil Ravishankar says the new Perth route is in response to demand from New Zealanders working in mines in Western Australia.

Air New Zealand's new Christchurch-to-Perth route is to service the increasing number of New Zealanders working in mines in Western Australia, chief executive Nikhil Ravishankar says.

This week, Air NZ announced three new international routes out of Christchurch to Singapore, Tokyo and Perth. It came just three weeks after it announced further flight cuts on regional routes.

Ravishankar told Nine to Noon that the three new routes made sense based on current fuel prices. He was confident they would stay but that would depend on future fuel cost.

Defending the new routes at a time of reduced services elsewhere, Ravishankar said the cuts had not been just to domestic routes.