These airlines offer relatively good and cheap connection, given that you find transport to/from the nearest airport:
All frlights from Luxembourg (Brussels – Ljubljana)
Wizzair (Brussels – Ljubljana)
Tuifly (Brussels – Trieste)
Bus connections between airports and certain cities:
Flibco shuttle for the connection between Luxembourg and Brussels (and other connections).
link to Flibco
GoOpti shuttle between Trieste or Venice and Ljubljana (and other connections)
link to GoOpti
Cheap flights finder:
GoAvio
Other useful flight search engines:
CheckFelix
Skyscanner
FareCompare
