Top ranked Qatar Airways together with their partner British Airways offer some interesting solution from Europe to Australia. Open jaw flights on route Ireland - Australia - UK are now available already for £436 (€554)! All taxes and fees as well as checked luggage are included in base fare. Look for flights from Dublin to Perth and returning back to London, Manchester, Edinburgh or Birmingham. Note that outbound flight is routed via UK but it is not possible to skip first leg Dublin - London. Rest of your itinerary would be voided. 
Limited travel options are available in second half of October and in November 2016. This Qatar Airways promotion is valid for bookings made till 31st of March 2016 or until sold out. Please find below booking sample to Perth if interested in this deal.
Booking samples
Travel date samples (Dublin - Australia - UK)
16. - 29.10.
23.10. - 12.11.
31.10. - 14.11.
6. - 19.11.
7. - 26.11.
If you consider to book these cheap open jaw flights to Australia you may compare connection flights from your hometown using service of Skyscanner.This tool helps you quickly to find out which low-cost airline is connecting from your city. To book your accommodation in Australia you may use Booking.com or consider following promo codes offred by Hotelopia or Venere.
Booking sample of cheap open-jaw flights to Australia from £436 (€554) here. In this case you would be departing from Dublin to Perth on 30th of October 2016. You would be returning from Australia back to London on 6th of June 2016.
