The cheapest way in. The Private transfer to Siena is 38 minutes quicker for €325.20 more, which is not worth it at this party size.
Tram T2 and Regionale to Siena
T2Regionale · GEST and TrenitaliaPickup, hours & luggage
Boards at. The Peretola Aeroporto tram stop
Two tickets, two contracts: EUR 2.00 on the tram plus EUR 10.80 on the Trenitalia Regionale from Santa Maria Novella to Siena. Neither ticket covers the other.
Luggage. One small bag free on the tram, a larger one needs its own ticket; the train has racks.