Table Of Content
- Why Do We Use Knots Instead of Miles Per Hour?
- How Fast Do Windstar’s Ships Go?
- Speed of Cruise Ships in Knots (Kn), Miles per hour (mph) and Kilometres per hour (kph)
- The Bottom Line: It’s Not a Race at Sea
- Cruise ship speed (knots to mph/kph conversion)
- How Did the Knot Become the Measuring Speed of the Seas?
- What Determines the Speed of a Cruise Ship?
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Why Do We Use Knots Instead of Miles Per Hour?
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The average speed of most cruise ships ranges from knots, providing a steady and enjoyable journey for passengers. Most cruise ships operate at an average speed of knots, which is equivalent to approximately miles per hour. This speed allows for a balance between efficient travel and passenger comfort. It provides a relatively smooth and stable experience for those onboard despite the vessel traversing through different weather conditions and waves. Most of the time, cruise ships operate at cruising speed, which is sometimes referred to as service speed. Cruising speed is not the highest speed a boat can reach, but a rate that provides a smooth, comfortable ride and saves fuel.
How Fast Do Windstar’s Ships Go?
Additionally, it’s worth noting that cruise ships rarely reach their maximum speeds, as safety and passenger comfort are always taken into consideration. Factors such as ship size, engine power, weather conditions, route and distance, and regulatory restrictions all play a role in determining the speed at which a cruise ship operates. By considering these factors, cruise lines aim to provide passengers with the optimal balance between itinerary, passenger experience, fuel efficiency, safety, and compliance with regulations.
Speed of Cruise Ships in Knots (Kn), Miles per hour (mph) and Kilometres per hour (kph)
So, although land-based miles per hour are just slightly faster than knots, for general purposes, it's a close comparison. For example, if your ship is sailing 20 knots, it's sailing roughly 23 mph. Ships aren't the fastest method of transportation, but that doesn't mean it's not fun to calculate your speed when you're sailing. QM2's Transatlantic crossing distance is almost 3,000 nautical miles, or ~3,400 statutes/normal miles (5,500 km), and this is done in less than 7 days. Currently, all cruise ships use propellers or screws to push the vessel through the water or to go in reverse. Airplanes require very fast propeller speeds to move through the air.
However, ships rely on torque power, move more slowly, and rarely top 30 knots due to the effect on the passengers and crew. Cruise ships often choose a cruising speed or service speed that is comfortable for passengers. This will be somewhere below the fastest possible speed the vessel can reach. Given how large cruise ships are, an average ship’s speed of 20 knots is pretty impressive. Longer cruises that involve crossing vast open seas tend to have higher average speeds.
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Cruise ship speed (knots to mph/kph conversion)
There are also a number of factors that impact travel speed, but we’ll get to that in a moment. A cruise ship can typically reach a speed of around 30 knots, about two to three knots higher than its cruising speed, but it’s not likely to go that fast. Cruise ships rarely hit top speed and will usually only do so if necessary. As a cruise enthusiast, I’ve always been curious about the speed of these massive vessels and how they can cover such vast distances in a day. So, I decided to delve deeper into the facts and figures surrounding the speed of cruise ships and the factors that can influence their velocity. The knot is a nautical term, meaning cruising one hour the distance of one nautical mile.
How Did the Knot Become the Measuring Speed of the Seas?
Cruise lines aim to find the optimal speed that allows them to cover the desired distance in a reasonable amount of time without excessively consuming fuel. Our article on fuel consumption provides a deeper understanding of how fuel usage impacts the maritime industry. When comparing modern cruise ships to historic vessels, it’s interesting to see how far the industry has come. For instance, a comparison of the Titanic and modern cruise ships reveals significant advancements in size, design, safety, and speed over the past century.
These propellor systems turn “screws” instead of long propellors like a plane. These screws need a lot of torque, instead of a lot of high-speed to operate. Cruising speed also improves fuel efficiency, the same way a certain speed improves fuel efficiency for your car. You may be able to drive your car at 80 MPH on the highway, but you’ll burn through a lot less gas if you drive at a steady 65 MPH. But "knot" isn't simply a misspelled nickname for "naut" (as in nautical mile).
What Determines the Speed of a Cruise Ship?

By most accounts, the fastest ship is/was Cunard's Queen Mary 2, with a top speed of 30 knots, or 35 mph. She was just a tad slower than sister vessel Queen Elizabeth 2, which ad a reported top speed of 32 knots. You’ll also notice the ship travels slower when you’re approaching a new harbor and pulling into the port. If you do happen to arrive early, the ship may even drop anchor off-shore until it’s time to dock. These are common precautions that ensure the safety of everyone on board. Although it sounds like a fun science experiment, no one these days has to stand on the bow and toss a knotted rope over the side.
The captain may sometimes decide to speed up if they know a storm is coming in hopes of outrunning it. Finally, a cruise ship maintains a certain speed to keep on schedule. If the captain goes faster, the ship may end up at the next port too early to dock, which may cause a delay, block other scheduled ships, and throw the itinerary off.
Just like when you drive your car on the motorway, if you drive at 80 mph, you’ll burn much more fuel during the journey than you would if you stuck to a steady 60 mph. With something as large as a cruise ship, that extra fuel will be expensive. To convert a speed in knots to miles per hour, you can multiply the knots by 1.151. If the ship arrives early, it usually stops and anchors at sea until the port call time arrives.
After all, you spend much time on the ship enjoying the amenities. In general, as long as they stick to the itinerary, speed is not an issue. It’s important to note that the specific influence of these factors may vary between cruise lines and individual voyages. Factors such as the size and design of the ship, the target market, and the cruise line’s overall strategy also come into play when determining the speed at which the ship will operate. The cheetah of the cruise ship Savannah is none other than the SS United States.
Large cruise ships constructed in the 1970s weighed between 20,000 and 30,000 tons, but by the 21st century, some cruise ships weighed as much as 220,000 tons. Cruise ship fuel efficiency varies based on factors such as itinerary and speed. Additionally, ocean currents can impact speeds and fuel consumption. It’s difficult to determine an average distance traveled on a full tank of fuel due to these variables. So while the thought of sailing on the fastest cruise ship in the world may be exciting, cruising is more about relaxation, leisure, and exploration.
We’ll talk about the different variables that affect speed and see how cruise ships compare to other ocean-going vessels. In short, the cruising speed of a ship dramatically depends on the ship’s size and design. The ship’s structure will determine how it burns fuel and how it navigates changing ocean conditions, all of which affect its speed. Cruise ships can go faster when they’re going in the same direction as the waves. However, rather than waiting for the right sea conditions to break speed records, cruise lines always use an average that factors in going both with and against the waves. They seem slow, but cruise ships can go much faster than we think.
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