Vayama

Skyscanner

Priceline

Try these websites with your date. Be little flexible with your dates (landing and arriving) so that you can get some knowledge about the cost and just couple days + or - can save you one, two or may even three hundred dollars. These websites have been using some good algorithm these days so you will find the best deal for international travel unlike just few years ago.

All the agencies are basically the same. However I want to spend my hard earned money where I can get the best costumer service. Thats why I have been calling back peaceland travel because from my experience the person there is very laid back and nice also doesn't really force you to buy ticket. (I think his name is ramesh, not sure).

In past I have talked with some rude people in past trying to get a quote.

Best of luck!