Flying into Auckland:
The Skybus Express is the most affordable & convenient transfer service available from the airport to the city centre which operates every 10 minutes during peak hours. Tickets can be purchased from the driver for $16.00 NZD per person one-way. Check out the link below for there website:
Flying into Christchurch:
The Metro service connect the airport to the city centre and many other locations in Christchurch. Tickets can be purchased from the driver for $8.00 NZD per person one-way. The purple line will take you right into the city centre from the Airport. Check out the link below for more information:
Flying into Queenstown:
The connectabus leaves from the Airport every 15 minutes and will drop off in central Queenstown. Only $12 for a ticket per person, per way.Click the link below to find out more information:
Flying into Wellington:
The Airport Flyer will get you from the Airport to the City Centre for roughly $6.00 and runs every 10 - 20 minutes. The link below can give you more information.
These are all the main airports backpackers will often fly into. If you are flying into anywhere else, there will be options available for you to get from the airport to where you need to be.