A few places for scourcing flights throughout Europe.
www.skyscanner.net
www.whoflies2where.com
www.ryanair.com
www.bmibaby.com
www.easyjet.com
www.xl.com
www.airberlin.com
www.jet2.com
www.wizzair.com
*edit*
www.thomsonfly.com
www.flightline.co.uk
www.cheapestflights.co.uk
www1.flight.co.uk
*edit*
For worldwide
www.opodo.com
I'll add more as I think of them !
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