Are there nonstop flights from Luton (LTN) to Ronchi dei Legionari/Trieste (TRS)?

No. The fastest connection is via Prague, about 2h 47m of total flying time.

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

via Prague ≈ 2h 47m, via Rome ≈ 3h 16m, via Olbia ≈ 3h 26m (estimated flying time, excluding layovers).

London Luton Airport (LTN) to Trieste Airport (TRS)・1,212 km

No nonstop flights. The fastest connection is via Prague (PRG), about 2h 47m of flying time (layover not included).

None.

10 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.