UPDATED 1.00pm

Fog restrictions have just been lifted at Auckland Airport, after being in place since around 7am.

Auckland Airport says around 42 domestic flights have been delayed and another 42 have been cancelled altogether.

One international flight from Brisbane was affected by the fog and was diverted to Wellington Airport. It will return to Auckland this afternoon.

Passengers are being urged to check Auckland Airport's website for the latest flight arrival and departure information.