Skyscanner is available for tablets and smartphones or you can go into the website www.skyscanner.com (also available in many other languages).
You can find the cheapest tickets from a destination to a certain city or even to countries (where they show which city in this country is the cheapest) in the next years, for a certain month, for a certain week or of course for a certain day.
Just try it, it is very easy to use. You will love it !
#2 XE Currency