If you decide to travel by bus, the coach transfer services managed by Terravision and Autostradale, leave, every day, from Pisa International Airport to Florence S.M. Novella station.
Click here for timetables
You can buy the ticket at Pisa Airport Information Desk.
For further information click on www.airportbusexpress.it or go to the Autostradale information desk outside the terminal near the parking bus area.