Travel options from Kumamoto Airport:
A trip to the Technopolis Center (Bus stop 4) takes only 10 mins.  
A trip to Kumamoto City or its bus terminal takes by bus, limo or taxi 40-45 mins. 
A trip to Kumamoto Station (Bus stop 2) takes by Limousine Bus 50 mins, and to Takamori Chuo (Bus stop 1) takes 50 mins.
A bus trip to Aso takes 1 hr, to Kurakawa Hot Springs 1.5 hrs., to Amakusa (Hondo) 3 hrs. 
A Highway Bus trip to Yatsushiro takes 1 hr & connects to Shinkansen Train at Shin-Yatsushiro Station. 

A trip via Express Bus to to Takachiho/ Nobeoka takes 3 hrs, to Oita 3 hrs and to Beppu 4 hrs. Bus Tickets for the Airport Limousine to  Kumamoto City and Amakusa (Bus Stop 2) can be purchased at the ticket machine located next to the ex in front of the Arrivals lobby, which is across from Bus Stop 2.

Google Plus One