General travel information

Pisa is reachable from 2 airports:

Pisa International Airport (PSA)
5-10 min shuttle PisaMover/bus or taxi (2 EUR/ 10 EUR) or 35 min walk from the conference venue.
Flight to Geneva - 100-250 EUR return ticket.
Connections to all major destinations in Europe, both regular and low cost
(Ryanair hub)

Firenze Airport (FLR)
Firenze/Pisa 1h train connections (every 20 min)
Flight to Geneva - 100-250 EUR return ticket.
Connections to all major destinations in Europe, both regular and low cost 

The Pisa International Airport and the Firenze Airport are hubs for many low cost airlines and they are efficiently connected to many destinations in Europe: they have regular flights to Rome, Frankfurt, Munich, Amsterdam, London, Paris, Madrid, Barcelona, Istanbul, Doha, Moscow for intercontinental connections. 

Pisa is also nicely connected via train (Firenze 1h, Roma/Milano 3h).

Some suggestions to book your travel:

Skyscanner

Trenitalia website

Flixbus