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Emirates posts and updates extra luggage costs on this webpage. As of today, the cost of extra luggage on flights departing from Australia to New Zealand are 15$ per kg regardless of flight class:
Note that it is cheaper to purchase extra luggage online than at the airport:
Purchasing online
Where the baggage allowance on your ticket is based on weight, you can purchase additional baggage online, at discounted rates, in blocks of 5kg up to a maximum of 25kg.
Online discounts per passenger are:
- 50% for the first 5kg;
- 20% for any subsequent amount.