A4 Torino - Trieste motorway
A23 Tarvisio - Udine - Palmanova motorway and then A4
Real Time Traffic Information > infoviaggiando.it/en

H5 from border Rabuiese (Muggia)
SS58 from border Fernetti

 

Trenitalia  
trenitalia.com
Railway routes:
Trieste - Gorizia - Udine
Trieste - Monfalcone - Cervignano - Venezia

Trieste - Lubiana
trenitalia.com/it/treni_regionali/friuli_venezia_giulia/scopri_la_sloveniacontrenitalia.html

Öbb (Österreichische Bundesbahnen)
Eurocity ÖBB Trieste - Ljubljana - Graz - Wien
obb-italia.com

Trieste Airport Friuli Venezia Giulia
triesteairport.it
Ronchi dei Legionari (Go) - Trieste
Trieste Regional Airport, 33 Km from Trieste
Trieste Airport train stop 

Venezia Airport
120 km from Trieste
bus routes and shuttle buses connect the airport to Venice-Mestre train station
veneziaairport.it

Treviso Airport
145 km from Trieste
bus routes and shuttle buses connect the airport to the railway station of Venice-Mestre and Treviso.
trevisoairport.it

Ljubljana Airport (Slo)
114 km from Trieste
lju-airport.si

Regional urban and suburban transport service
TPL FVG is the consortium, which manages the Local Public Transport of the Friuli Venezia Giulia region on road and by sea.
Numero verde 800 052040
tplfvg.it

Autostazionetrieste
Connections with Trieste Airport, Venezia Airport, Slovenia, Croatia, Austria, Germany and Serbia.
At the bus station ticket office you will also find tickets for the following carriers: Flixbus, Buscenter, Autotrans, Brioni Pula, Croatiabus, Crnja Tours, Nomago, Fils, Florentia Bus, Euroda, Srbija Tours, Fudeks, Sanatrans Atlassib ed Eurolines-Baltour.​​​​​​​
autostazionetrieste.it

By hydrofoil
Trieste-Piran, Rovinj, Lussinpiccolo and Poreč (only in summer)
libertylines.it/en/destinations/trieste

By motorboat
tplfvg.it/en/il-viaggio/maritime-services
Trieste-Grado (only in summer)
Trieste-Muggia
Trieste-Barcola-Grignano-Sistiana (only in summer)