Tokyo is not itself a cruise port, but is served by the port of Yokohama. In total, Yokohama serves as the embarkation for around sixty sailings annually from Cunard, Holland America, Celebrity and more to Asia.
Cruises departing from Tokyo during the peak seasons of winter and spring are significantly more expensive than the the low season of fall. On average Tokyo is rather expensive compared to other ports. Check the illustration below for the average cost per day by month (Cruises only depart from Tokyo between January and October).
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