Qatar Airways, airlines of the year 2015 (by Skytrax), are offering some attractive solution to fly cheap from Europe to Australia. We are adding samples for round trip flights as well as open jaw tickets. Currently the cheapest open-jaw flights are available for just £451/€610! The cheapest option to Australia would be an open jaw tickets on route Venice / Dublin to Perth and returning back to UK. (London, Manchester, Edinburgh). Another option would be departing from Benelux (Brussels, Amsterdam) where round trip flights are starting at £495 (€669).
The travel options and restrictions vary based on chosen routing and airline. Generally you should be able to find the cheapest flights between October 2015 till 16th of June 2016. (date of your departure to Australia). With currently running Qatar Airways promotion you may book the flights for this cheap fare till 21st of October or until sold out. Max stay 3 months. If you want to book your hotel in Australia in advance you may check some affordable accommodation via booking agents such as Hotelopia. They are now also offering 6% promotional code for additional discount off hotel rooms. More details to be found here.
Booking samples
Qatar Airways
Brussels/Amsterdam - Perth - UK from £495/€669 (use Skyscanner UK for the lowest fare)
Air China
The easiest way to check your connection possibilities is through Skyscanner. This tool gives you quickly a rough idea which low-cost airlines are connecting your home town. If you would book directly with the airline you may also check latest valid Qatar Airways promotion code.
Booking sample of cheap flights from Europe to Australia from £451/€610 here. In this case you would be departing from Venice to Perth on 16th of February 2016. Your return flight from Australia back to London would be then on 5th of March 2016.