Alghero to Carbonia trains might be a good value for money solution: travelling in Italy by train is often rather cheap and faster than taking a bus indeed Trains leave from Sassari and arrive at Carbonia Serbariu every about 3 hours on average. If travelling with Trenitalia, you need to know the Alghero to Carbonia train schedule: the first train leaves at 06:33, while the last ride is at 16:20. A Alghero to Carbonia train cost about 16.9 €. But how long is the train ride from Alghero to Carbonia? Your journey takes about 4 hours on average.