I was cleaning up the expired deals on IWTF and found that Perth - Singapore Return via Singapore Airlines is on sale.
This is a full service airline so you receive bags & food. Next best deals are from Scoot but are a bit around $350 but you need to pay extra for bags and food ($56 each way) so around $450 total. It seems that this may be the cheapest Singapore Airlines Perth-Singapore flight seen on OzBargain. March: $445, March: $543, Feb: $457, Jan: $558. So price is trending down which is good for Perth travellers.
Some good dates for a weekend away if you take the late night flights out.
Dep. Tue 16/May/17Ret. Fri 19/May/17Economy $433
Dep. Thu 18/May/17Ret. Mon 22/May/17Economy $433
Dep. Fri 26/May/17Ret. Tue 30/May/17Economy $433
Dep. Fri 04/Aug/17Ret. Mon 07/Aug/17Economy $433
Dep. Wed 23/Aug/17Ret. Tue 29/Aug/17Economy $433
Dep. Mon 23/Oct/17Ret. Thu 26/Oct/17Economy $433
Dep. Mon 23/Oct/17Ret. Sat 28/Oct/17Economy $433
Dep. Tue 24/Oct/17Ret. Sun 29/Oct/17Economy $433
Dep. Tue 15/Aug/17Ret. Mon 21/Aug/17Economy $433
Dep. Thu 17/Aug/17Ret. Wed 23/Aug/17Economy $433
Dep. Thu 24/Aug/17Ret. Mon 28/Aug/17Economy $433
Dep. Thu 12/Oct/17Ret. Tue 17/Oct/17Economy $433
Dep. Tue 30/May/17Ret. Tue 06/Jun/17Economy $438
Dep. Fri 08/Sep/17Ret. Wed 13/Sep/17Economy $438
Any business class deals from Melbourne in June??