We have just returned from Croatia on the Ryanair Rijeka-Stanstead route. We had flown into Ljubljana and I found difficulty in finding information about tranfers to Rjeka Airport (on Krk). To our delight we discovered that there is a link for each outgoing flight which starts not in Rjeka but at the bus station in Opatija which was only a couple of hundred metres from our hotel room so it was the easiest transfer ever! Tokk about an hour and a half and cost 50 kuna. Hope this helps someone else.