Between the Ronchi dei Legionari Airport (Trieste) and Slovenia there are the following connections:

By bus:
Ronchi dei Legionari Airport (Trieste) and Slovenia have a connection once a day; the bus from the airport to Portorož leaves at 14.30 p.m. Another possibility is to take the APT number 51 from the airport to the city of Trieste. Several buses go from the station in Trieste to Slovenia each day. 
Additional information can be found on the following web page:
www.aptgorizia.it

Bus Trieste - Koper:
6.00
7.15 
9.00
11.15
12.30
13.00
14.00
15.30
17.15 
19.00

Bus Trieste - Koper - Portorož:
9.00
11.15
15.30
17.15


You can buy bus tickets from the airport-Trieste at the airport, and tickets from Trieste-Slovenia can be bought on the bus.

If you travel to Slovenia from the airport in Venice (Marco Polo), you will first have to go by bus to the railway station Mestre in Venice. The bus ATVO will get you there. The timetable can be found HERE. Tickets can be bought on the bus.

Then at the railway station Mestre in Venice, find the train to Trieste (for additional information click HERE).
For getting from Trieste to Slovenia we suggest taking a bus (as described above). The bus and railway stations in Trieste are only separated by a road.

Transport services from Venice ad Trieste airports to Slovenia are also offered by the low-cost carrier GoOpti.


By ship:
Between Piran and Venice there is a catamaran route as well. For more information click HERE.