Airfares
The best way to New York I suggest is from Perth to Melbourne, from Melbourne to Los Angeles and from Los Angeles to New York! It will take around 39 hours and 5 minutes all together. This flight it a long time so it is best to stop off at other places.
Cheap Flights
The lowest prices on economy is from $1000 to $2000. If you want to go on business is will cost from $6000 to $7000. For the best and cheapest flights I suggest go to "webjet.com.au/" or go to "emirates.com.au/" these sites will give you a safe flight for a low price. If you want to travel first class it would cost about $10000 dollars. I hope you have a safe and happy flight!