You can walk from the city to Eden Park if you're fit, or grab an Onzo or Lime scooter and get to Kingsland on our excellent new cycle way.
Airport bus will drop you at Mt Eden station, two stops from Morningside.
Will take you about 45mins to walk from Aotea Square to Eden Park or about an hour from downtown Auckland. Otherwise train's easy from Britomart (downtown Auckland). Get off at Morningside stop for the pre-game drinks otherwise Eden Parks easy enough.
There's several buses that go along Sandringham rd - 274 is one of the top of my head.
Otherwise Uber Zoomy from town will cost probably $10-$15.
Hope this helps ?