Paris is served by the ports of Le Havre and Rouen, but is not actually a cruise port. In total, Le Havre and Rouen serves as the departure port for only thirty cruises per year from Norwegian, Cunard, and MSC to Europe.
Overall Paris is somewhat expensive compared to other ports. The graph below shows the monthly average cost per day for cruises from Paris (Cruises only depart from Paris between January and December). Sailings scheduled from Paris during the the peak season of summer are much more expensive than the the low season of winter.
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