Park & Ride South – Fast Park is Auckland Airport's official long-stay car park at 500 Puhinui Rd in Wiri, Manukau City, holding a 4.5 rating on Google, with booking and details on the airport's website.
The whole appeal of a park & ride is the shuttle: you park the car yourself, keep your keys, and a bus carries you and your bags to the terminal doors. How often the buses run, and how long the ride takes, is what separates a relaxed departure from a stressful one, so allow a buffer either side of your flight and make sure you know where the return pick-up happens. Booking online ahead of travel is usually cheaper than the drive-up rate, and a quick photo of your row saves tired wandering at the end of a long journey.
For Auckland travellers, having the airport's own car park on Puhinui Rd means the terminals are only ever a short shuttle ride away.