What is the sister ship to Allure of the Seas?

Although not an exact duplicate of its sister ship, the Oasis of the Seas, both ships share some of the most innovative and revolutionary features found on cruise ships today.



The primary and most direct "sister ship" to Allure of the Seas is the Oasis of the Seas, which was the first ship in Royal Caribbean's revolutionary Oasis Class. Both ships were nearly identical when launched, with Allure being officially "two inches longer" than Oasis due to temperature differences during construction. In 2026, the "Oasis Class" family has grown to include several other sisters: Harmony of the Seas, Symphony of the Seas, Wonder of the Seas, and the newest titan, Utopia of the Seas. While they all share the same "Seven Neighborhood" concept—including the iconic Boardwalk, Central Park, and the AquaTheater—each newer sister has added unique features like the "Ultimate Abyss" slide or refined dining concepts. For a 2026 traveler, sailing on Allure offers a slightly more "classic" Oasis experience, though it remains one of the largest and most feature-packed vessels on the ocean today.

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Oasis of the Seas and Allure of the Seas are virtually identical, though Oasis of the Seas features Cats, while Allure of the Seas presents Mamma Mia! Secondary shows in the main theater differ on all five of the Oasis-class ships.

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The first two ships in the class, Oasis of the Seas and Allure of the Seas, were delivered respectively in 2009 and 2010 by STX Europe Turku Shipyard, Finland. A third Oasis-class vessel, Harmony of the Seas, was delivered in 2016 built by STX France. A fourth vessel, Symphony of the Seas, was completed in March 2018.

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The 225,282-ton Allure of the Seas was the world's largest cruise ship -- for six years -- before other sister ships kept stealing the title; the latest being Wonder of the Seas debuting in 2022. The Allure of the Seas capacity is 5,492 passengers at double occupancy or 6,452 when every berth is full.

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Allure of the Seas ranks #4 out of 25 Royal Caribbean International Cruise Ships based on an analysis of expert and user ratings, as well as health ratings. Allure of the Seas offers a wide range of accomodation options. Browse cabins to find the stateroom that suits your needs.

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The classified length of Allure of the Seas is the same as that of her sister, 360 metres (1,181 ft), though she is reported to be 50 millimetres (2 in) longer than Oasis of the Seas.

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The 'jewel in the crown' of the Royal Caribbean Group, Silversea is the leading ultra-luxury and expedition cruise line—acclaimed for both its all-inclusive lifestyle offering and its global destination portfolio.

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The ships are pretty much the same, in terms of size, layout, cabins and entertainment -- with just one or two changes. So if you're familiar with Allure (or Oasis of the Seas), then you'll feel quite at home on Harmony.

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While Oasis got upgraded in 2019, Allure has yet to receive a second major refurbishment. (It was postponed due to the pandemic and is now scheduled for 2025.)

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Symphony is a beautiful ship, but so is Allure. The biggest difference will be one has slides and the other doesn't. Symphony will have the newer restaurants making the diamond lounge in a new location. Solarium will be a bit different and there won't be a Champagne Bar on Symphony.

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Some 10 other multicolored sculptures form his court, as well as a splash pool, a shallow pool and a lazy river pool. There is also a (free) frozen yogurt dispenser there.

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Here, every Royal Caribbean ship currently in operation is ranked from biggest to smallest.
  • Wonder of the Seas. MICHEL VERDURE STUDIO/ROYAL CARIBBEAN. ...
  • Symphony of the Seas. ROYAL CARIBBEAN. ...
  • Harmony of the Seas. MICHEL VERDURE/ROYAL CARIBBEAN. ...
  • Oasis of the Seas. ...
  • Allure of the Seas. ...
  • Spectrum of the Seas. ...
  • 7 (tied). ...
  • 7 (tied).


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Following the Independence of the Seas, the Explorer of the Seas and the Mariner of the Seas, the Symphony became the fourth Royal Caribbean ship to be drydocked at the Spanish shipyard in 2023. After the work, 2018-built vessel kicked off a summer program in the Western Mediterranean on April 16.

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Dubbed world's biggest cruise ship can occupy 5,600+ guests Royal Caribbean has its sights set on claiming the title of the world's largest cruise ship with its multi-leveled and technicolor Icon of the Seas, set to be released in January 2024.

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Amy Lynn Bradley (born May 12, 1974) is an American woman who went missing during a Caribbean cruise on the Royal Caribbean International cruise ship Rhapsody of the Seas in late March 1998 at the age of 23 while en route to Curaçao.

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The Titanic had a beam of only 92.5 feet and a length of 882.8 feet, meaning it was a long and skinny vessel. While the Allure has a max beam of almost 200 feet and a length 1,187 feet, meaning it is almost fat compared to the Titanic.

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