From Munich you can find trains to Venice (no change), then in Venice there are several non stop trains to Trieste.
Check DB and Trenitalia web sites.
actually,sever.all 2hrs yes stop trains to Trieste
-:- Message from TripAdvisor staff -:-
This topic has been closed to new posts due to inactivity. We hope you'll join the conversation by posting to an open topic or starting a new one.
To review the TripAdvisor Forums Posting Guidelines, please follow this link: http://www.tripadvisor.com/pages/forums_posting_guidelines.html
We remove posts that do not follow our posting guidelines, and we reserve the right to remove any post for any reason.