Fertilia airport, run by a company called Sogeaal, is located in the north-east of Sardinia, at about 15 km from Alghero's centre and at about 240 km from Cagliari. The Alghero airport is one of the most important ones in northern Sardinia , even because of the many national and international airways.
Reaching the Algero airport by bus:
It is possible to reach Cagliari from the Algero airport by an Alghero-Cagliari bus: for further informations about the route check it out on the Google Maps available at the website Arst transports putting the departure time and the day of your choice. There's also a section ot the Arst website where you can check the location of bus stops to Sassari. The one-way ticket regular fare is of 16€.
Reaching the Alghero airport by train:
The Alghero airport is not connected to Cagliari by any direct railroad line , thus it is more convenient to split your itinerary into two parts: the first one by bus from Alghero to Sassari, the second one by train from Sassari to Cagliari. You can reach Sassari from the Alghero airport by an Arst bus which can be find at the Arrivals, (towards Sassari).
It is also possible to plan the best route using Google Maps, following this link to Arst website. The journey takes 30 minutes and requires a 2.50€, simple fare, one way ticket. The last bus stop in Sassari, Via XXV Aprile, is near to the station where it is possible to take a train to Piazza Matteotti, in Cagliari. The journey takes three hours and requires a 16€ ticket. To check the train schedule follow this link to the Trenitalia Sardegna official website.
Renting a car at the Alghero airport
It is also possible to rent a car at the Alghero airport car rental service, provided by Hertz, Europcar, Avis e Sixt. In order to reach Cagliari, head North along the SP44, leaving the airport , until you reach the SS291 on the way to Sassari, at the end take the SS131 towards Cagliari until you reach your destination. For more details about the journey check it out on Google maps. During the journey, which takes about two hours and thirty five minutes, for 240km you might also enjoy the unspoilt landscapes.