The easiset way to get from Pisa airport (PSA) to the Pisa city center is by train.
Trains leave from the airport train station, which is conveniently located just outside of the arrivals hall at Pisa airport. Rail services operate twice an hour throughout the day, and the journey takes 5 minutes.
Before boarding, make sure to purchase a ticket at the train ticket office in Pisa airport. It is located at the opposite end of the terminal building from the train platform. The cost of a one-way train ticket from Pisa airport to Pisa is 1.50 euros.
Trains from Pisa airport arrive at Pisa Centrale train station, which is located right in the heart of the city. From there you can explore Pisa or connect to trains to Cinque Terre, Florence and other popular destinations.