There are majorly two ways to travel from New York, USA to Sydney, Australia. The first way is the cheapest way and the other is the quickest way. If you want to take the cheapest way, then it will cost you approximately $617 USD (Rs. 50,479.86) and that flight is 25 hours and 17 minutes long. However, if you want to travel the quickest way, then that will take approximately 24 hours and 41 minutes, however the cost for the same is $626 USD (Rs. 51,216.19), making it a $9.00 (Rs. 736.34) difference between the 2 options.
Hope this gives you a better insight.
