The biggest cruise ship in the world today is nothing short of a floating city. The Icon of the Seas weighs in at 248,663 tonnes and stretches 365 metres from bow to stern.
At three times the weight of the QE2, the Icon is a world of destinations in itself. Inside, you’ll find an ice skating rink, a water park, a swim-up bar, and even a suspended infinity pool. But this giant ship is set to be joined by an even heavier sistership in 2025.
Cruise Industry News lists 17 cruise ships projected to enter service in 2025. These range from American cruise line’s Patriot and Pioneer ships, with the capacity for 125 guests, to giant mega ships accommodating 5,000 or more.
Eight of these ships weigh in at over 100,000 tonnes. Three of them are more than 200,000 tonnes in weight - that’s the same as around 500 fully laden Boeing 747 jumbo jets. These are the five biggest cruise ships ready to float in 2025.
1. Royal Caribbean’s Star of the Seas
Joining Icon of the Seas this year will be the second of the Icon class ships from Royal Caribbean. Star of the Seas is expected to be just like her sistership, although on paper, she weighs in slightly higher at 250,800 tonnes.
Construction began in February 2023, and just last October, the ship was floated out for the first time.
While the Icon of the Seas sails from Miami, the Star of the Seas will cruise from Port Canaveral. Itineraries will be seven nights and will touch Eastern and Western Caribbean destinations, including Royal Caribbean’s own private island, Perfect Day at CocoCay.
Onboard are eight different neighbourhoods, 40 dining and drinking outlets, multiple swimming pools, and dozens of waterslides. Cabins are stunning, with options to upgrade to panoramic sea or sunset views, and even a three-story Family Townhouse complete with an in-suite slide.
Full operation of the ship will begin on 31 August, but ahead of that, Royal Caribbean is running a handful of ‘showcase sailings’. These shorter three-night trips are a great opportunity for cruise lovers to check out the giant ship at a lower cost.
2. Disney Cruise Line’s Adventure
Adventure will be the eighth cruise ship owned and operated by Disney Cruise Line, and its biggest yet. Coming in more than 50,000 tonnes heavier than its Wish class vessels at 208,000 tonnes, the ship is 342 metres in length and will accommodate around 6,000 guests.
As well as being Disney’s largest cruise ship, Adventure will be the first to be based in Asia. Operating out of Singapore, the ship will undertake short three to five-night cruises with no ports of call, just a Disney party in the ocean.
Onboard is the first-ever Disney Cruise Line rollercoaster at sea, seven themed lands, and a Marvel ‘style studio’ where you can get a heroic makeover (and yes, adults are allowed too). Stage shows are plentiful, and choices of staterooms and suites - some that even have private hot tubs.
Adventure is still under construction and hasn’t been floated out yet. It’s expected to do so in May. Its maiden voyage is set to take place on 15 December, when it will head out for its first three-night trip.
3. MSC Cruises World America
At 205,700 tonnes and 333 metres in length, World America isn’t much smaller than the Icon class giants of Royal Caribbean. It’s the second World-class ship built for MSC Cruises following World Europa, which entered service in December 2022. But while Europa sails from ports in the Mediterranean, America is destined for, well, America.
From Miami, World America will sail seven-night Caribbean cruises, alternating East and West Caribbean itineraries. Included in the ports of call will be Puerto Rico, Dominican Republic, Mexico and Honduras.
Within the 22 decks, there’s a choice of 19 different restaurants plus 20 bars and lounges. There’s a waterpark, shows, copious shopping opportunities and the Family Aventura theme park, featuring the industry’s first over-water swings.
The ship is complete and ready to sail. It’s due to have its official naming in Miami on 9 April, for which its Godmother, Drew Barrymore, is set to be in attendance. World America left the French port of Saint Nazaire on 27 March and should arrive in Miami on 6 April. It is planned to depart on its maiden voyage on 12 April.
4. Princess Cruises Star Princess
The Star Princess is the second Sphere-class cruise ship for Princess Cruises, following Sun Princess, which took its first trip in February 2024. The pair are the largest ships ever built in Italy, with a length of 345 metres, accommodation for 4,300 and a weight of 175,000 tonnes.
Many features of the Star will be similar to its sistership, although it does have some new additions. The new ship will have pickleball and basketball courts, as well as a jogging track, and expanded areas in the most popular outlets, including O’Malley’s Irish Pub.
The vessel is still under construction and is expected to be delivered in September 2025. Its planned maiden voyage will be on 4 October, with its initial trips focused around the Mediterranean Sea. By late October, the ship will redeploy to the Caribbean, and in early 2026, it will head to Alaska.
5. TUI Cruises Mein Schiff Relax
This 160,000-tonne megaship is one you don’t need to wait for. TUI’s Mein Schiff Relax was officially delivered on 7 February and entered service on 2 March. It’s been operating a series of Mediterranean cruises out of Palma de Mallorca since then.
Onboard, the ship has a strong focus on wellness and relaxation. Its spa offers massages and other treatments, while a jogging track and soft-floored yoga deck let guests stretch their legs. There’s a kids club, pool and sauna, and more than 30 bars and restaurants to choose from.
At present, Mein Schiff Relax is running seven or eight-night cruises from Mallorca, touching points in Spain, France and Italy. Later in the year, it will switch to the south, operating eight- and nine-night cruises down to the Canary Islands.
Can cruise ships get any bigger?
While critics may brandish these gargantuan ships as monuments to excess, the feat of engineering and ingenuity they represent cannot be ignored.
Royal Caribbean’s Icon class ships have raised the bar for cruising, but the question remains - can ships get any bigger?
Italian shipbuilder Fincantieri, which constructs cruise vessels for the likes of Princess Cruises, MSC Cruises and others, told the Telegraph there is no specific ceiling for the maximum size of the craft.
The spokesperson said there’s no engineering reason cruise ships can’t continue to increase in size, as changes in maneuverability can be compensated for with more powerful propulsion.
However, challenges will arise when it comes to docking and maintaining anything bigger - some of the largest ships in service today already struggle to find ports to accommodate their size, often mooring offshore and ferrying passengers in by water taxi.
And the people who live in ports where these massive ships dock also feel the impact. Several European tourist hotspots are restricting cruises from docking, including the Greek island of Santorini, where tens of thousands of passengers disembark on peak days.
Then, of course, there’s the environmental impact to consider. All these new ships are LNG-powered, which the cruise lines like to tout as being ‘green.’ However, while LNG is lower in CO2 emissions, it releases other, more harmful gases, and is considered by the World Economic Forum to be a ‘bridge fuel,’ not a sustainable long-term solution.
But the biggest challenge to an even larger ship is market demand. In the past there was a trend of ‘bigger is better,’ and not just in cruising. Aircraft like the A380 and Boeing 747 were once the epitome of modern travel, but times are changing.
Post-COVID, more people are concerned about being in close quarters with strangers and prioritise comfort over size. In aviation, this has seen the widespread retirement of double-decker planes; whether the cruise market ends up going in the same direction remains to be seen.
