UPDATE: It looks like the super cheap fares have sold out. The prices are now $1300+. I hope some of you managed to grab the deal!
I was playing around with Multi-city fares and I found these really cheap flights to Los Angeles that allow long stopovers in Hawaii and San Francisco. You can alter the order so that you go to Los Angeles or Hawaii first. I have given some example dates below, but I think this is available from Feb - Sep/2020.
Departing Melbourne from $766
MEL -> HNL 23/Aug/2020
HNL -> LAX 30/Aug/2020
LAX -> SFO 12/Sep/2020
SFO -> MEL 19/Sep/2020
Departing Melbourne from $778
MEL -> LAX 23/Aug/2020
LAX -> HNL 30/Aug/2020
HNL -> SFO 12/Sep/2020
SFO -> MEL 19/Sep/2020
SYD -> LAX 10/Feb/2020
LAX -> HNL 24/Feb/2020
HNL -> SFO 02/Mar/2020
SFO -> SYD 09/Mar/2020
For this airfare and more, check out our deals site http://iknowthepilot.com.au/
Can't take advantage of it, but damn that's a bargain flight combo