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 Chitose is April and the most expensive month to fly is May. (Average prices, based on 315 datapoints.)
The best day to arrive at Tokyo is Tuesday and it would be best to avoid Thursday, as prices are on average 91.7% higher than on Tuesday. (Average prices, based on 215 datapoints.)