Travelling from most locations, it is best to book your flight to Japan during the month of September for the best deal, although there are other times of the year which offer great deals as well.
In general, most flyers find the cheapest time to book a flight to Japan is about 60 days prior.
From most locations, the cheapest day to fly to Japan is Tuesday. Most users found that departing on a Friday was most expensive.
Generally, when visiting Japan, afternoon flights represent the best value. noon flights are likely to have higher prices.