I normally use whichbudget.com to scout out LCC's to get around Europe, but like Southwest in the US, don't assume the LCC is going to be the cheapest.
Case in point: Wanted to get six people from NCE to CDG/ORY in October. It seemed that EasyJet was going to be the winner, but just for laughs I checked out the Air France website. All in English, very easy to navigate, and it turned out their fare (o/w) was about $50 (fares are priced in wharever currency you want). Plus, they had flights all day, about every hour, as opposed to EasyJet's 6:00AM and 10:00PM usual offerings.
Note: The flight was on a Saturday - If we were flying on a Friday or a Sunday, the o/w price was over $450!