Two gateways, New Chitose International Airport & Asahikawa Airport.
Furano is located in right centre of Hokkaido geographycally. Big gateway is New Chitose Airport, it is just 2.5 hours to Furano by car. Also Asahiakawa airport is very convinient to go sightseeing on the way to Furano. You can rent a car at the airport and just 15 minuts driving pass popular place 'Biei' rolling hills. It is just 60 minutes diriving to Furano.
Please refer useful links below;