A senior staffer in the Prime Minister's office has returned a negative Covid-19 test.
Prime Minister Jacinda Arden and Governor-General Dame Cindy Kiro were among passengers asked to self-isolate after being on a flight with a positive case.
Ardern is fully vaccinated and received a booster shot on 17 January.
Ardern and Dame Cindy were on flight NZ8273 from Kerikeri to Auckland on 22 January. They were in Northland undertaking advance filming at the Waitangi Treaty Grounds for the Waitangi Day broadcast.
The Ministry of Health listed the flight on Saturday as a location of interest.
Ardern is in isolation until tomorrow, and had a PCR Covid-19 test first thing on Sunday.
Her results are yet to come in, but a staff member who was on the flight with her has this morning had a negative result.
Ardern's office said at the weekend that she felt well and had no symptoms.