To get from Olbia a Selargius by train you can catch one of the 5 trains that everyday travel between Olbia and Cagliari, the closest station to the city. For your trip from Olbia to Cagliari by train you can choose to leave from one of Olbia main stations: Olbia If travelling with Trenitalia, you need to know the Olbia to Cagliari train schedule: the first train leaves at 05:53, while the last ride is at 18:52. A Olbia to Cagliari train cost about 18.00 €. But how long is the train ride from Olbia to Cagliari? Your journey takes about 4 hours on average. Trenitalia offers 2 direct trains between these two cities. Thanks to Trenitalia, offers, you can save on your trip from Olbia to Cagliari and find low cost tickets starting from 18 €! Booking your train ticket a few weeks in advance though, you can find low cost trains from Olbia to Cagliari with fares starting from 18.00€, saving 0% on average.