The New South Wales health authority has advised that at least one person who later tested positive for Covid-19 travelled to Wellington from Sydney last weekend.
Passengers on two flights between Sydney and Wellington have been identified as close contacts.
The flights were Qantas QF-163, which left Sydney on Friday the 18th June and landed in Wellington just after midnight on Saturday 19 June, and Air New Zealand NZ-247, which left Wellington on the morning of Monday 21 June.
The New South Wales health authority is urging anyone who was on those flights to get a Covid-19 test, and to self-isolate for 14 days regardless of the result.
The New Zealand Ministry of Health have confirmed that any passengers on these flights must isolate immediately and call healthline for more information.