Access to Odaiba area
There are 3 international airports in Japan as main entrance gates. Those are Narita International Airport@(http://www.narita-airport.jp/en/index.html), Chubu International Airport, Centrair in Nagoya City (http://www.centrair.jp/en/index.html) and Kansai International Airport (http://www.kansai-airport.or.jp/en/index.asp).
When you arrive at Chubu International Airport, Centrair or Kansai International Airport, we would like to recommend to transport to Haneda Airport in Tokyo (Tokyo International Airport, http://www.tokyo-airport-bldg.co.jp/en/). It will be most convenience rout for you to come to Odaiba area.
(1) from Narita to Odaiba
They have a direct transportation from Narita International Airport to Odaiba area by using airport limousine buses. Please refer to following web site of Airport Limousine Co.; http://www.limousinebus.co.jp/en/index.html.
It takes about 75min to come from Narita to Odaiba area. Figure shows bus stops of airport limousine bus from Narita and Haneda. The cost of the ticket is 2,700JY.

(2) from Haneda to Odaiba
They have a direct transportation from Haneda Airport to Odaiba area by using airport limousine buses. Please refer to following web site of Airport Limousine Co.; http://www.limousinebus.co.jp/en/index.html.
It takes about 20min from Haneda to Odaiba area. The bus stops in Odaiba are the same as those of Narita-Odaiba rout. The cost of the ticket is 600JY.
(3) Transportation in Odaiba
(a) Yurikamome, New Transit Yurikamome (http://www.yurikamome.co.jp/en/)
In Odaiba area, they serve a transportation from Shinbashi to Toyosu by a new transit system. The railway map is on a following website;
http://www.yurikamome.co.jp/en/core_sys/images/others/pdf/outline_english.pdf
(b)Tokyo Bay Shuttle
They serve free shuttle buses in Odaiba area from 11:00 to 20:00. Sorry but they have not English homepages, only Japanese pages.