Some cheap flights to Australia (including Tasmania) are still available based on promotional deal of Etihad Airways/Virgin Australia. Open-jaw flights from Europe on route Dublin – Australia – Germany (Frankfurt, Munich) or London are now available already for €664 or Ł533. If you are flexible enough to plan your journey in advance this is great solution to many travellers within Europe. (you can save some great money especially when looking for some cheap solution to remote Tasmania..)
You can book these cheap flights to various cities in Australia (Perth, Melbourne, Sydney, Brisbane) mainly within April and May 2015. You may also consider to visit Tasmania for very attractive fare considering the destination. One Way tickets between Dublin and Germany or London should be matter of less than €25 if you book in advance as they are well connected with Ryanair.
Check out your options rough Skyscanner giving you quickly an ideal what your possibilities are..
Booking sample of cheap open jaw flights to Australia from Europe for €664. In this case you would be departing from Dublin to Melbourne on 5th of May. Your return flights from Australia back to Germany (Frankfurt) would take place on 26th of May 2015.