The quickest way to find the cheapest international airline tickets is by using Kayak, a travel search engine. The cool thing about kayak is that it uses other travel search engines like Orbitz, Airfare etc. to find the best prices for you.
You can also compare its search result with those of Hotwire, Priceline, Expedia, Travelocity [...]

Planning on flying anytime soon? Use Vayama, a travel website, which make the transition of booking a flight really easy. It also does a good job of finding the best airfares for you.
I recently flew to Amsterdam and I used Kayak, a travel search engine, which refered me to Vayama.
Kayak found the best price for [...]