Flights in and out of Auckland and Hamilton airports have been delayed or cancelled due to thick overnight fog.

A flight from Melbourne to Auckland was diverted to Christchurch, and a flight from Brisbane to Hamilton was diverted to Auckland, TVNZ has reported.

Some flights between the two cities have also been cancelled, as has a flight from Auckland to Rotorua this morning.

Information on flights can be found at Auckland International Airport's website and Hamilton International Airport's website.

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- Herald Online staff