Info:
For a cheap flight to Ljubljana check at least Wizzair, RyanAir and Adria Airways. Or search for connections to Rijeka (HR), Pula (HR), Zagreb (HR), Zadar (HR), Treviso (IT), Trieste (IT), Venice (IT), Vienna (AT), Klagenfurt (AT) or Budapest (HU) and from there we can help you to arrange an airport transfer to Ljubljana!
Here are some good flight search engines:
www.momondo.com
www.skyscanner.com
www.google.com/flights