Airlines have cancelled more than 30 flights between New Zealand and Australia amid growing concerns about the latest outbreak of Covid-19.

Direct flights on Air New Zealand from Wellington, Christchurch and Queenstown to Sydney have all been cancelled.

The airline will continue to run flights from Auckland to Sydney over the period of the suspension.

The cancellations on Air New Zealand are understood to affect 28 flights in total.

In addition to Air New Zealand's cancellations, Jetstar has also cancelled all its flights between Sydney and Auckland for today and tomorrow.

"We'll continue to monitor the situation and update customers if there's any further changes to our schedule in the coming days," a Jetstar spokesperson said.

This comes after the announcement from the Government yesterday that the transtasman travel bubble between New Zealand and New South Wales would be suspended for 72 hours.

"Our customer team is contacting impacted customers and we are providing customers the option to rebook, put their flight into credit, or receive a refund if they purchased a refundable ticket," said Air New Zealand chief operational integrity and safety officer captain David Morgan.

The Ministry of Health's director of public health Dr Caroline McElnay said the situation would be monitored for further developments.

The local concern has escalated further with the confirmation that a man infected with the highly infectious Delta strain of Covid-19 spent two and half days in Wellington doing "tourist things" before returning home to Sydney and testing positive.

Covid-19 Response Minister Chris Hipkins said the man had received one dose of the AstraZeneca vaccine and his partner, who he travelled with, is awaiting her Covid-19 test results.

Cabinet is currently meeting to discuss a potential alert level change ahead of today's Covid-19 update from health officials on the scramble to track down contacts of an Australian man infected with the virus who visited Wellington.