At the moment all of those low cost carriers in Europe run specials to fill up their planes. Some of those specials are limited to certain dates and times of booking, e.g. Air Berlin says if you book flights from Germany to France today you'll get the 2nd ticket free (only the tax applies). Ryanair and Germanwings do things like that as well. BUT you'd only know about those specials if you subscribe to their newsletters. So as soon as you know you're going to go to Europe do sign up for their newsletters in order to being kept informed. You can then unsubscribe as soon as all of your flights are booked ;-)
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Knoxville, TN, USA
7209 posts
If you don't want to sign up for newsletters you can always just check the websites of the airlines that service the cities you are interested in.
SkyEurope is having a great deal right now for travel from Prague to Venice in June for an all-inclusive price of 19Euro. That's a great deal.