Centrair Airport (Central Japan International Airport) in Aichi Prefecture is the closest international airport. http://www.centrair.jp/en/index.html
(If you arrive at Narita, you have to take a bullet train from Tokyo to Nagoya station.)
After arriving at the airport, you can take;
- a train to Nagoya station (30mins, 850yen), and from there, it is easier to join the chartered bus (60mins, 1500yen) organized by IYEO to go to the Yokkaichi Port.The buses from Nagoya station will be arranged at 12:00, 13:00, and 15:00.
- a boat to Yokkaichi Port(1690yen, 35mins)
http://www.centrair.jp/en/access/ac-to-vessel/index.html
is 16:30.
After getting off the Nippon Maru at Yokohama Port, then if you are leaving from Tokyo, departure airport should be from Narita Airport.
Need a consultation??? then write to nipponmaru-cruise@iyeo.or.jp