The slick site looks a bit confusing to use at first glance, but it’s actually quite simple. You just plug in your location and prospective travel dates and it goes to work, revealing a far-reaching web of flight paths and what they’ll cost you (the cheapest destination shows up in green). From there, you can filter the selection down by using the suite of tools on the left hand side, which let you sort by budget, or by direct flights only, or even by visa requirements based on your nationality.
There’s even the option to sort by a place’s popularity and type of weather. Also if you have a particular region, country, or continent in mind, you can restrict the results to see which cities are cheapest to fly to in that particular area.