The average speed of a modern cruise ship is roughly 20 knots (23 miles per hour), with maximum speeds reaching about 30 knots (34.5 miles per hour).
Also to know is, what is the cruising speed of a cruise ship?
Although her normal cruising speed is between 24 and 26 knots (48 km/h), this behemoth is capable of speeds of up to 30 knots (56 km/h), making her the fastest cruise ship in the world, thanks to an environmentally friendly plant with electricity generated by four huge diesel engines and two gas turbines.
How fast is an ocean liner?
The fastest ship in service today is Cunard's Queen Mary 2. Designed as an ocean liner, she needs speed in order to handle the variable conditions of the North Atlantic. Her official top speed is 28 knots but the ship has done close to 30 knots.