You can get to Portorož by several means of transportation.
The easiest way is to take a shuttle service. You can get a direct transport from any airport in vicinity (Italy, Austria, Croatia) to Portorož with GoOpti transport.
You can make the reservation for transfer to your hotel for a special price.
Bus or train
If you don't decide for the shuttle service, you can travel by bus
. If you fly to Slovenia, Jože Pučnik airport, you can get a bus to Ljubljana and there take a train or bus to Koper. From there the easiest way to get to Portorož is to take a taxi or you can also get there by bus.