Rome to Naples by train
Trains between Rome and Naples run within the Italy national rail network. The typical end-to-end journey is around 1h 3m.
Operators on this corridor include Trenitalia (Frecciarossa), Italo.
Train fares are dynamic — typical range is €26 to €74. Advance-purchase tickets (1–2 months ahead) almost always beat walk-up prices.
On routes under 600 km like this one, train often beats flight door-to-door once you factor in airport check-in and transfers.