You are looking for the cheapest fare available and you do not mind perfect routing or you see advantage of long layovers have a look on another awesome deal from Europe to Australia or New Zealand based on Air China. (Star Alliance). Return flights are available already for €492 incl. all fees and checked bag. Look for flights departing from main airports in Germany (Dusseldorf, Munich, Frankfurt). You can choose to fly to Brisbane, Melbourne, Sydney or Auckland. In some cases you will be eligitly to get free transit hotel in Beijing. (More details here).
If interested in this offer with Air China you will find the cheapest flights in May 2018. Max stay 3 months. Promotion is running till 28th of February..below you can refer to our booking sample on each of possible routes.
Booking samples
Dusseldorf - Melbourne from €492
Munich - Melbourne from €499
Frankfurt - Melbourne from €510
Dusseldorf - Brisbane from €503
Munich - Brisbane from €509
Frankfurt - Brisbane from €526
Dusseldorf - Sydney from €506
Munich - Sydney from €514
Frankfurt - Sydney from €524
Dusseldorf - Auckland from €514
Munich - Auckland from €521
Frankfurt - Auckland from €538
London - Australia / New Zealand from £406
UK - Perth, Australia from £516 (Etihad Airways)
Booking sample of Cheap return flights from Germany to Australia or New Zealand from €492 here. As in aour above link your outbound flight from dusseldorf to Melbourne would be on 13th of May. You would return from Australia back to Europe on 27th of May 2018.