Venice airport to trieste

Bus looks to be the simplest solution

https://www.flixbus.com/bus-routes/bus-venice-marco-polo-airport-trieste

Is my suspicion you are making the trip to get on a cruise ship correct? If so, does the cruise line not offer a solution?

Train is not complicated, but you will have to take a bus to Mestre train station where there are frequent trains to Trieste. If there is an available bus service direct from the airport to Trieste, that might be the simplest solution.

We'll be making this transit it late August. We're normally train people. This time, knowing we'll be jet-lagged, we decided to book a shared ride with GoOpti.com (we have used them before). Reasonable for meeting us @ baggage claim and dropping us off at the front door where we'll be staying in Trieste.

Thanks for the input, All.

We used OptiGo and it was great. We did not realize that you could book drop off at your specific address, but the driver was kind and accommodating and saved us a 25 minute, jet lagged walk. Definitely the way to go. We are NOT on a cruise; don’t realize that Trieste was such a popular starting point.

A fellow passenger who lives in Trieste also suggested OptiGo to get to Piran in Slovenia.

Of course, it is GoOpti, not OptiGo. That was jet lag talking.