Alghero to Cagliari 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 Cagliari every about 2 hours on average. If travelling with Trenitalia, you need to know the Alghero to Cagliari train schedule: the first train leaves at 06:33, while the last ride is at 19:21. A Alghero to Cagliari train cost about 15.75 €. But how long is the train ride from Alghero to Cagliari? Your journey takes about 3 hours on average. Trenitalia offers 3 direct trains between these two cities. Thanks to Trenitalia, offers, you can save on your trip from Alghero to Cagliari and find low cost tickets starting from 16 €!