Below is a definitive ranking of the cruise ships that truly dominate the seas. While a handful of operators have pushed the envelope, Royal Caribbean International leads the pack, followed by MSC Cruises, Costa Cruises, and P&O Cruises.
When comparing cruise vessels, four core metrics give a clear picture of their scale:
Launched in 2024, Royal Caribbean’s Icon of the Seas now holds the title of the world’s largest passenger ship. With a GT of 250,800, it can carry 7,600 guests, measures 1,197 ft (365 m) in length and 217 ft (66 m) wide. Its Miami‑bound itineraries across the Caribbean feature the biggest onboard pool and six water slides, setting new standards for ocean‑borne leisure.
The final Oasis‑class vessel, Utopia of the Seas, entered service in 2024. It boasts a GT of 236,473, an LOA of 1,185 ft (361 m), a beam of 210 ft (64 m), and accommodates 6,509 passengers. Notably, it is the first of its class to run on liquefied natural gas (LNG), reflecting Royal Caribbean’s commitment to cleaner propulsion.
Debuting in 2022, Wonder of the Seas once held the title of the world’s largest cruise ship. It offers a GT of 235,600, 1,188 ft (362 m) of length, 210 ft (64 m) beam, and a capacity for 6,988 guests. The ship’s onboard attractions—boardwalk, solarium, zip line—deliver a full‑onboard vacation experience.
When it sailed in 2018, Symphony of the Seas eclipsed all competitors with a GT of 228,081, 1,184 ft (361 m) length, and 216 ft (66 m) beam. It can host 6,680 passengers and now anchors in Port of Miami. Amenities include a rock‑climbing wall, laser tag arena, and a variety of dining and nightlife venues.
Released in 2016, Harmony of the Seas held the world record for two years before being surpassed by Symphony. It features a GT of 226,963, 1,188 ft (362 m) length, 216 ft (66 m) beam, and accommodates 6,687 guests. The ship’s “neighborhood” layout offers distinct zones that showcase its enormity.
The flagship of the original Oasis class, launched in 2009, carries a GT of 226,838, an LOA of 1,180 ft (360 m), and a beam of 198 ft (61 m). It can hold 6,771 passengers and currently sails from Ft. Lauderdale, Florida to Caribbean ports.
Allure, a sister to Oasis, entered service in 2010. With a GT of 225,282, an LOA of 1,180 ft (360 m), a beam of 198 ft (61 m), and a capacity for 6,780 guests, it now operates out of Port Canaveral. The ship offers a skating rink, an indoor park with 12,000 plants, and a range of entertainment options.
MSC Cruises’ World Europa, which began sailing in 2022, joins the top ten with a GT of 215,863, an LOA of 1,094 ft (333 m), a beam of 154 ft (47 m), and a capacity of 6,762 guests. It runs on LNG, diverging from the diesel power typical of most cruise ships, and served as a floating hotel during the 2022 FIFA World Cup in Doha.
Costa Cruises’ flagship, launched in 2021, features a GT of 186,364, an LOA of 1,106 ft (337 m), a beam of 138 ft (42 m), and can accommodate 6,554 passengers. Sailing the Mediterranean, it delivers a distinctly European, upscale experience.
P&O Cruises’ Arvia made its maiden voyage in 2022 from Southampton to the Canary Islands. With a GT of 185,581, an LOA of 1,130 ft (345 m), a beam of 138 ft (42 m), and a capacity for 6,685 guests, it operates in the Mediterranean during summer and the Caribbean in winter. A retractable sky dome enhances the onboard ambience.
