Trieste can be reached flying to Venice (airport Marco Polo) or to Triestre (airport Ronchi Dei Legionari).
Flying to Venice:
The easiest way to get to Trieste from the airport of venice "Marco Polo" is to use the Shuttle services that will drop you directly in town. Shuttle services connecting Trieste to theairports (Ronchi dei Legionari , Lubjana,Venice-Marco Polo) are available upon reservation:
http://www.science-bus.com/index.php?l=en or https://www.goopti.com/en/
You can also reach Venezia Mestre Train Station from Marco Polo airport by bus and to get a regional train to Trieste Central Station. A bus shuttle connects the Venezia Airport to Venezia Mestre Railway Station. The bus fare is 8 euros. Timetables and information at www.atvo.it
Tickets can be bought online or at the airport arrivals.
At Mestre rail-station the regional train /TRIESTE via PORTOGRUARO/(not via Udine which is longer) runs every hour. The trip will last less than 2 hours at the cost range from 12 to 26 euros (visit www.trenitalia.com for time table).
Flying to Trieste:
The Trieste airport is connected to the city center via the APT-bus line 51. The bus stop is located on the right side of the Arrivals exitand takes in approximately one hour to Trieste Central Station. The bus timetable can be found at: www.aptgorizia.it
Cost 3 euros (4 euros if the ticket is purchased on the bus).