The Biggest Cruise Ships in the World in 2025

Modern-day cruise ships have completely reimagined the face of travel. Offering a blend of luxury, entertainment, and premium amenities, they have evolved into a premier destination in themselves. Royal Caribbean International continues to be a leader in big ship cruising. In 2025, it has set the stage for a new era in passenger ships by launching Icon of the Seas, which has claimed the title of the biggest cruise ship in the world weighing even more than the Titanic. Here is a list of the 10 biggest cruise ships, transforming ocean travel into an unmatched luxurious experience.

Rank	Ship Name	Cruise Line	Gross Tonnage (GT)	Length (m)	Passenger Capacity	Year Launched
1.	Icon of the Seas	Royal Caribbean	250,800 GT	364.75	7,600	2024
2.	Utopia of the Seas	Royal Caribbean	236,860 GT	362	6509	2024
3.	Wonder of the Seas	Royal Caribbean	235,600	362	7,084	2022
4.	Symphony of the Seas	Royal Caribbean	228,081 GT	361.01	6,680	2018
5.	Harmony of the Seas	Royal Caribbean	226,963 GT	362.12	6,687	2016
6.	Oasis of the Seas	Royal Caribbean	226,838 GT	361.6	6,771	2009
7.	Allure of the Seas	Royal Caribbean	225,282 GT	361.6	6,780	2010
8.	MSC World America	MSC Cruises	216,638 GT	333.3	6,762	2025
9.	MSC World Europa	MSC Cruises	215,863 GT	333.3	6,762	2022
10	Costa Smeralda	Costa  Cruises	185,010 GT	337	6,554	2019

1. Icon of the Seas – Royal Caribbean

• Size, Capacity, Launch Year, Standout Features: Launched in Jan 2024, it is the biggest cruise ship ever with a gross tonnage of 250,800. The newest member of the Royal Caribbean fleet is 364.75 metres long and has a maximum passenger capacity of up to 7,600. It is the first Royal Caribbean ship to use liquefied natural gas (LNG) and fuel cell technology. The unique features include 6 waterslides, AquaDome, Royal Bay Pool, and Crown’s Edge.
  
• Onboard Amenities: 8 neighbourhoods, Absolute Zero Ice Arena, Surfside Family Suite, over 40 dining venues, and Thrill Island.
  
• Destinations and Itineraries: 7-night cruises, departing from Miami, covering both Eastern and Western routes, including stops at St. Thomas, the Bahamas, Cozumel, and Perfect Day at CocoCay.
  
• Who These Ships Are Best Suited For: Multigenerational travellers, diverse social groups, families, and adventure seekers.

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2. Utopia of the Seas – Royal Caribbean

• Size, Capacity, Launch Year, Standout Features: This is the world’s second-largest cruise ship, launched in 2024, that is 362 metres long, has a gross tonnage of 236,860 and a maximum passenger capacity of up to 6,509. Being the first LNG-powered Oasis-class ship, it comes with a sustainable travel experience, perfectly tailored for thrilling weekend escapades.
  
• Onboard Amenities: More than 20 dining venues, 3 water slides, 2 casinos, 5 pools, AquaTheater, Ice Skating Rink, Ultimate Abyss, and FlowRider.
  
• Destinations and Itineraries: 3- and 4-night Bahamas cruises departing from Orlando’s Port Canaveral with stops at Nassau and Perfect Day Coco Cay, in the Bahamas.
  
• Who These Ships Are Best Suited For: Immersive cruise experience perfect for couples, young adults, and spirited families craving high-energy, fun breaks.

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3. Wonder of the Seas – Royal Caribbean

• Size, Capacity, Launch Year, Standout Features: This Oasis-class mega vessel had its maiden voyage in 2022. Boasting 235,600 gross tonnage and a length of 362 metres, it has a passenger capacity of up to 7,084 guests. The unique features include a new Suite Neighbourhood, 10 whirlpools, and 8 distinct neighbourhoods.
  
• Onboard Amenities: Wonder of the Seas features 18 decks, 19 pools, 25 dining options, a Sea Spa, Fitness Centre, FlowRider, a zip line, and a mini-golf court.
  
• Destinations and Itineraries: Primarily 7-night Eastern/Western Caribbean cruises departing from Port Canaveral (Orlando), Florida.
  
• Who These Ships Are Best Suited For: Travellers looking for adventure-based, lively cruise experiences with endless activities.

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4. Symphony of the Seas – Royal Caribbean

• Size, Capacity, Launch Year, Standout Features: Making its debut in 2018, Symphony of the Seas dominated as the world’s largest cruise ship till 2022. With a staggering 228,081 gross tonnage, and a maximum capacity of 6,680 passengers, this impressive Oasis Class ship redefines the limits of passenger ships. With the 7 neighbourhood concept, Ultimate Abyss, and FlowRider surf simulators, it showcases the unmatched innovation of Royal Caribbean International.
  
• Onboard Amenities: Two-deck Royal Theater, rock-climbing walls, 20+ dining venues, zip-lining, mini-golf & sports court, 23 pools, and more.
  
• Destinations and Itineraries: With a home port in Miami, the ship’s itinerary primarily features 7-night Eastern and Western Caribbean voyages with limited options for transatlantic crossings.
  
• Who These Ships Are Best Suited For: Adventure seekers, families with kids, tech-savvy cruisers, and luxury travellers.

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5. Harmony of the Seas – Royal Caribbean

• Size, Capacity, Launch Year, Standout Features: Known as one of the most prominent family cruise ships, Harmony of the Seas began its journey in 2016. Measuring 362.2 metres in length, with a gross tonnage of 226,963, it can accommodate up to 6,687 passengers. With unique features like The Perfect Storm Waterslides, Aqua Theater, Robot-controlled Bionic Bar, and Ultimate Abyss, it is like a floating city packed with world-class entertainment.
  
• Onboard Amenities: Adventure Ocean, teen lounges, Royal Theater e for Broadway-style shows, The Perfect Storm” water slides, and Vitality at Sea Spa.
  
• Destinations and Itineraries: 7-night Caribbean getaways departing from Galveston, Texas, with stops at Cozumel, Roatán, and Costa Maya.
  
• Who These Ships Are Best Suited For: Luxury seekers and multi-generational groups looking for an exceptional entertainment and family-friendly cruise experience.

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6. Oasis of the Seas – Royal Caribbean

• Size, Capacity, Launch Year, Standout Features: With a maiden voyage in 2009, Oasis of the Seas is one of the most iconic passenger ships which pioneered the neighbourhood concept. With over 226,838 gross tonnage and a maximum capacity of 6,771 passengers, it reshaped the capabilities of the world’s largest ships. Boasting Splashaway Bay, Royal Escape Room, Ice Rink, Casino Royale, it reflects the trailblazing approach of Royal Caribbean International in modern cruising.
  
• Onboard Amenities: 7 themed zones, such as Central Park, Royal Promenade, Boardwalk, Adult-Only Retreats (Solarium), Youth & Teen Spaces, and retail outlets.
  
• Destinations and Itineraries: With a home port in Fort Lauderdale, Florida, this cruise ship will call at Willemstad, Oranjestad – Aruba, and other ports.
  
• Who These Ships Are Best Suited For: Adventure enthusiasts, couples, and cruisers seeking an all-in-one vacation at sea.

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7. Allure of the Seas – Royal Caribbean

• Size, Capacity, Launch Year, Standout Features: With its maiden voyage in 2010, this Oasis-class vessel has emerged as a crown jewel in the world-class fleet of Royal Caribbean International. With a 225,282 GT and massive 6,780 passenger capacity, it has received multiple accolades as the Best Large Cruise Ship, Best for Entertainment, and Best Individual Ship. Some of the unique features include 7 themed zones, the Ultimate Abyss, and the FlowRider surf simulator.
  
• Onboard Amenities: Nightlife Hotspots, H2O Zone kids’ water park, Broadway-style shows, resort-style pool deck, and Rock-Climbing Wall.
  
• Destinations and Itineraries: 7-night Western Mediterranean cruise departing from Civitavecchia (Rome), Italy, with stops at Naples, Italy; Barcelona, Spain, and others.
  
• Who These Ships Are Best Suited For: Families, friends, social cruisers, and entertainment lovers who want to enjoy a plethora of thrilling mega-ship experiences.

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8. MSC World America – MSC Cruises

• Size, Capacity, Launch Year, Standout Features: Debuted in April 2025, MSC World America is the largest cruise ship operated by MSC Cruises. With a gross tonnage of 216,638, 22 decks, a capacity of 6,762 guests, and sustainable LNG power system, it matches up against the most distinguished cruise giants. Offering the best of European elegance with American comfort, it has unique features like Cliffhanger Over-Water Swing, 7 districts, and World Galleria LED Ceiling.
  
• Onboard Amenities: First Eataly at Sea, MSC Yacht Club sundeck, World Promenade, MSC Aurea Spa, and The Spiral, 11-deck dry slide.
  
• Destinations and Itineraries: A 7-night Caribbean package starting from Port Miami, sailing through Cozumel, Isla Roatan, and MSC’s private island, Ocean Cay MSC Marine Reserve.
  
• Who These Ships Are Best Suited For: Perfect for families, couples, and eco-conscious travellers looking for an extravagant international Caribbean cruise experience with a European flair.

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9. MSC World Europa – MSC Cruises

• Size, Capacity, Launch Year, Standout Features: The cruise commenced its maiden voyage in Dec 2022 and ranks among MSC’s mega-cruise entries today. With a staggering 215,863 gross tonnage and 333.3 metres in length, it can accommodate up to 6,762 guests. The world-class cruise ship stands out for its futuristic design and innovative features such as the “Spiral” dry slide, 104 m outdoor World Promenade, and expansive LED-sky canopy.
  
• Onboard Amenities: 16 guest decks, 13 restaurants, 20 bars, Aurora Borealis Aquapark, multiple pools, and a panoramic promenade.
  
• Destinations and Itineraries: Planned across the Mediterranean Sea for 7-10 nights, passing through Genoa, Naples, Messina, Valletta, Barcelona, and Marseille.
  
• Who These Ships Are Best Suited For: Families, couples, crust enthusiasts who seek entertainment, sustainability, adventures, and upscale living—all in one floating resort.

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10. Costa Smeralda – Costa Cruises

• Size, Capacity, Launch Year, Standout Features: Named after Sardinia’s famed Emerald Coast, Costa Smeralda is the largest cruise ship of Costa Cruises. Making its debut in 2019, this LNG-powered vessel boasts a 185,010 gross tonnage, 20 decks, and a passenger capacity of 6,554. It features the Costa Design Museum, the first museum at sea that showcases unmatched Italian design.
  
• Onboard Amenities: Vibrant “Italian-style” cruising inspired by Italian cities, 4 swimming pools, 16 dining venues, and Colosseo.
  
• Destinations and Itineraries: Primarily 7-night Western Mediterranean Sea itineraries, visiting Savona, Marseille, Barcelona, Palma de Mallorca, Palermo, and Civitavecchia (Rome).
  
• Who These Ships Are Best Suited For: Families, couples, and culture enthusiasts looking to make the most of Mediterranean exploration through rich experiences.

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What Makes a Cruise Ship ‘Big’?

Gross Tonnage vs. Length vs. Passenger Capacity

• Gross Tonnage (GT): This is the primary metric, which also means the total internal volume of a ship. 1 GT = ~2.83 cubic metres. A higher GT means more internal space for various amenities.
  
• Length: The physical span of the cruise, ranging from the bow to the stern.
  
• Passenger Capacity: Maximum number of guests that can be accommodated.
  
• Number of Decks: These are vertical scales specifically designed for dining, entertainment, and accommodation.
  

Why Size Matters in the Cruise World

• Economies of Scale: The more the number of passengers on board, the lesser the cost of operations per passenger, making the trips accessible to many.
  
• More Amenities and Activities: Having a larger space inside the ship allows for diverse activities and features, including water parks, shopping arenas, rock climbing, dining, and much more.
  
• The Scale Appeal and Marketing: The bigger the size of the cruise, the more people are attracted to it.
  
• Increased Stability: Larger cruises generally offer more stable rides even when the sea is rough.
  
• Energy Efficiency: Latest mega-cruisers such as the Icon of the Seas, Utopia Icon of the Seas, and Costa Smeralda use LNG, significantly reducing emissions.
  

Cruise Lines Leading the Mega Ship Trend

Royal Caribbean’s Dominance

Royal Caribbean International leads the charge in the world of the largest cruise ships. The Oasis-class truly revolutionised the experience, while the Icon-class ships raised the bar. Premier destinations inside the ship, such as innovative neighbourhoods, jaw-dropping entertainment and attractions, have made them a premier choice among travellers.

MSC and Carnival’s Contenders

Major cruise lines are also raising the bar with innovative designs and feature upgrades.

• MSC Cruises: Primarily investing in larger, eco-friendly ships with a fine touch of European elegance.
• Carnival Cruise Line: They take pride in their Excel-class ships, focused on creating a lively atmosphere for passengers.
• Norwegian Cruise Line (NCL): Known for its “Freestyle Cruising” and go-karting racetracks.
• Disney Cruise Line: Focused on theme-based, immersive family experience for onboard passengers.

The race is ongoing to build the largest cruise ships, with new vessels constantly pushing the boundaries of passenger experience and maritime engineering. For travellers around the world, it offers a wider range of unique experiences and unforgettable adventures. The future for the cruise ship industry looks promising as ever and these monumental cruises continue to redefine the very essence of ocean travel.

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Frequently Asked Questions