Are there nonstop flights from Rome (CIA) to Ronchi dei Legionari/Trieste (TRS)?

No. The fastest connection is via Olbia, about 2h 4m of total flying time.

What is the fastest connection from Rome (CIA) to Ronchi dei Legionari/Trieste (TRS)?

via Olbia ≈ 2h 4m, via Cagliari ≈ 2h 27m, via Tirana ≈ 2h 32m (estimated flying time, excluding layovers).

Ciampino–G. B. Pastine International Airport (CIA) to Trieste Airport (TRS)・453 km

No nonstop flights. The fastest connection is via Olbia (OLB), about 2h 4m of flying time (layover not included).

None.

3 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.