Hi,
I published this a while ago and it got banned as spam and wanted to make it right.
The link to the airline is this: http://www.qatarairways.com/global/en/homepage.page
And the dates I found are this: 10th May - 2nd of June
If you go to Skyscanner, as somebody mentioned before, you can get a cheaper price $49 less, but it redirects you to a third party that has its prices listed in GBP, so once you are paying they will recalculate the price to AUD and you will have to pay for the exchange. I did check this and I preferred to list the airlines prices directly in AUD because I find it more reliable. I actually do this to avoid bad surprises for people.
Also people were saying, some not in a very nice way, that this cannot be the cheapest flight to Europe but at least from Adelaide, Brisbane, Melbourne and Sydney I have found nothing better till November.
Cheers,
Eva
Sorry, this is not the best price, refer below:
http://postimg.org/image/tfb4q9h41/
The prices are in AUD, for the same dates, route & airline you posted in the OP.
Skyscanner really isn't hard to use, this took me less than a minute to find.