The best month to fly between Chitose and Tokyo is October and the most expensive month to fly is March. (Average prices, based on 1099 datapoints.)
The best day to arrive at Chitose is Sunday and it would be best to avoid Friday, as prices are on average 13.37% higher than on Sunday. (Average prices, based on 1099 datapoints.)
The best time to fly is at around 17. (Average prices, based on 2048 datapoints.)