Air NZ says the two-week break will allow time to secure the crew and aircraft required to continue operating the route.
Air NZ regional affairs manager Jason Dawson said the airline wanted to support the communities most impacted by Cyclone Gabrielle to help them stay connected.
“We launched this temporary service to restore vital transportation links between the two regions – to support families and friends looking to be reunited and help essential workers get to where they need to be.
“With the road link still cut off, we’ve extended the service for as long as we can.”
Flights will be operating six times per week, and the additional flights went on sale on Monday.