Just four kilometres north of the city centre, Florence's Amerigo Vespucci Airport (better known as Peretola Airport) - served by Alitalia, Air France, Lufthansa and many more - is very well connected to the city. By bus (6€) or taxi (20-25€) the city centre can be reached in 20-30 min.
International direct connections are with Amsterdam, Barcellona, Berlin, Birmingham, Bordeaux, Brussels, Copenhagen, Düsseldorf, Frankfürth, Geneva, London, Lyon, Madrid, Moscow, Münich, Paris, Stuttgart, Vienna, Zürich.
Many other connections are possible from nearby airports of Pisa (1h by train) and Bologna (40 min by train).
Pisa Airport Network
An extensive network of international and national connections is available in the Pisa airport from which Firenze by be reached in about 1h by coach or train. See more at: www.pisa-airport.com
Other nearby airports:
Bologna (www.bologna-airport.it), Rome and Milan
From all these airports Florence can be easy reach by train.
Direct FrecciaRossa trains from/to Florence to/from Bologna have a frequency of nearly twice an hour (duration of the journey: 37 min.)
ww.adr.it Direct FrecciaRossa trains from/to Florence to/from Rome have a frequency of nearly twice an hour (duration of the journey: 1h and 30 min.).
Direct FrecciaRossa trains from/to Florence to/from Milan have an average hourly frequency (duration of the journey: 1h and 45 min.). Direct FrecciaRossa trains from/to Florence to/from Milan Malpensa Airport (duration of the journey: 2h and 40 Min)
The Florence Santa Maria Novella Train Station (Firenze SMN), just 2 min from congress centre, connects Florence with Rome in 1h and 30 min and Milano in 2h. There are many international connections with several European cities.