Arriving in Tokyo
The international Airport of is Narita It's propose on it's website the list of the companies and the insured destination (direct fly). It's very useful to prepare your travel plan.
Maybe, it's a good idea for those who arrive late or who leave early to stay a night in an Hotel (luxury) in the near vicinity of the Airport (Check prices on Internet) but whose prices are affordable - you can take the very charmin tower of Narita which brings the scenery and wealthy that you would exept from Janapn without the presure of the center of Tokyo. Visit Narita The hotel bus will easily lead you
At the national airport Haneda, arrive some flights from Corea, Shangai, and Honk Hong.
To research the best tariff, consult a price comparison between propositions of generalist agencies, like IllicoTravel or UnVolSvp, AcheterUnVol, BilletsAvion, TrouverUnVol, ComparAvion,
A panorama enough complete of the supply of transport on Japan is available on the site TCH-Voyages
Finally, if you decide at the last minute, don't forget to consult offers on Lastminute or the Wednesday opportunities on Air France.
Arriving in Japan
It may be interesting for your arrival or your departure to choose another airport for a better tariff and the opportunity to visit (a little)Japan. I suggest: Nagoya, Osaka or Fukuoka, coupled with an unlimited rail pass, in order to travel a week.
Specialised on Japan travel agencies
Often better than airways companies or generalist agencies, you can ask a specialized agency, so you can benefit of best tariffs: Some addresses: