Please be aware that Tokyo has multiple airports and that these results are for all airports serving the city.
The best month to fly between Tokyo and Hong Kong is May and the most expensive month to fly is January. (Average prices, based on 438 datapoints.)
The best day to arrive at Tokyo is Wednesday and it would be best to avoid Friday, as prices are on average 58.59% higher than on Wednesday. (Average prices, based on 368 datapoints.)
The cheapest airline flying from Tokyo to Hong Kong is Hong Kong Express. They are 88% cheaper than All Nippon Airways. (Average prices, based on 461 datapoints.)
The best time to fly is at around 1. (Average prices, based on 1195 datapoints.)