Royal Caribbean’s Oasis class is six ships — Oasis, Allure, Harmony, Symphony, Wonder and Utopia of the Seas — built to the same split-superstructure design that puts open-air neighbourhoods in the middle of the vessel. They are close enough in size and layout that the itinerary usually matters more than the hull, and the real differences are departure port, whether a Suite Neighbourhood exists, and how long the sailings run.
Six ships, one class, and a fifteen-year spread between the oldest and the newest. Most of what is written about them describes the ships, and that is the easy part — they are all enormous, they all carry the same seven neighbourhoods, and their tonnage varies by about five percent. The harder question is which of the six you should actually put a deposit on, so we will start there.
Which one should you actually book
The honest answer is that the itinerary matters more than the hull. These ships are similar enough that sailing the wrong week on the newest one is a worse holiday than sailing the right week on the oldest. But if the schedule gives you a genuine choice:
Choose Utopia if you want a short break, not a week. Three and four-night sailings from Port Canaveral are a different product from a seven-night Caribbean loop — busier, younger, more compressed. Some people love that. If you were picturing sea days and a slow rhythm, it is the wrong ship.
Choose Wonder if you are booking a suite. The Suite Neighbourhood is the one feature in this class that does not exist on the older hulls, and it is the single clearest reason to pay for a specific ship rather than a specific week.
Choose Harmony if you would rather drive than fly. Galveston removes a flight and a pre-cruise hotel night for a large part of the country, and that is worth more than any onboard difference in this class.
Choose Allure or Oasis if the price is better. Both have been refurbished — Allure in 2025, Oasis in 2019 — and a refurbished older ship in this class is not a compromise. Allure is also the one to look at for a European sailing.
Choose Symphony if you want the default. It is the middle-aged, Miami-based, week-long Caribbean version of the class, and it is the one that will most closely match what you have seen in photographs.
What makes a ship Oasis class
A ship class is a set of vessels built to the same basic design. Royal Caribbean’s Oasis class launched with Oasis of the Seas in 2009 and now runs to six hulls. What they share is the split superstructure — the ship is effectively divided down the middle above a certain deck, which is what allows the Central Park and Boardwalk neighbourhoods to sit open to the sky in the centre of the vessel rather than being enclosed.
That layout is the reason the class feels different from a conventional megaship. Instead of one long interior promenade, you get seven distinct neighbourhoods, and a large share of the cabins look inward over Central Park or the Boardwalk rather than out to sea. Whether that is a feature or a drawback depends entirely on what you want from a balcony.
All six are enormous. The smallest, Allure of the Seas, is 225,282 gross tons; the largest, Utopia of the Seas, is 236,473. That five percent spread is not something you notice walking around. The differences that matter are elsewhere.
The six ships, oldest to newest
Oasis of the Seas (2009) is the original, and it was refurbished in 2019 — which matters, because that refit brought it much closer to its younger sisters than its build year suggests. 5,400 guests at double occupancy, 16 decks. Caribbean sailings.
Allure of the Seas (2010) had the most recent refurbishment of any ship in the class, completed in 2025. It carries 5,492 guests across 16 decks. Unusually for the class, it has been sailing the Western Mediterranean rather than the Caribbean.
Harmony of the Seas (2016) was the first of the second wave and has not had a major refurbishment. 5,497 guests, 16 decks, homeported in Galveston, Texas — which makes it the practical choice if you are driving from Texas or the central states rather than flying to Florida.
Symphony of the Seas (2018) carries 5,518 guests on 16 decks and sails from Miami. For several years it was the largest cruise ship in the world, and it is still the one most people picture when they think of the class.
Wonder of the Seas (2022) added a genuine structural change: an eighth neighbourhood, the Suite Neighbourhood, which is a separate keycard-access area for suite guests. 5,734 guests, 16 decks. It moved to PortMiami in August 2025 and now sails both Caribbean and Mediterranean seasons.
Utopia of the Seas (2024) is the outlier, and the one most worth understanding before you book. It is the first LNG-powered ship in the class, it has 18 decks where the other five have 16, and it sails short three- and four-night trips from Port Canaveral rather than week-long itineraries.
Where the class is genuinely weak
The neighbourhood layout means a significant number of balconies face inward. An interior-facing balcony overlooking Central Park is pleasant and quiet; a Boardwalk balcony is neither, particularly below the AquaTheater. If you are booking a balcony on any of these six ships, check what it actually overlooks before you confirm — our guide to choosing a cabin covers what to look for.
Scale cuts both ways. Boarding, tendering and disembarkation all take longer with five and a half thousand people aboard, and the headline attractions run on reservations that open before you sail. If you dislike planning, this class asks more of you than a smaller ship does.
And these ships do not go everywhere. Their size restricts them to ports that can physically take them, which is why the class concentrates on the Caribbean and a handful of large Mediterranean ports rather than the smaller, quieter stops.
Common questions
How many Oasis-class ships are there?
Six: Oasis of the Seas (2009), Allure (2010), Harmony (2016), Symphony (2018), Wonder (2022) and Utopia (2024).
Which Oasis-class ship is the newest?
Utopia of the Seas, in service since 2024. It is also the only one with 18 decks rather than 16, and the only LNG-powered ship in the class.
Which is the biggest?
Utopia of the Seas at 236,473 gross tons, narrowly ahead of Wonder of the Seas at 235,600. The spread across the whole class is only about five percent.
Is an older Oasis-class ship worth booking?
Yes. Allure was refurbished in 2025 and Oasis in 2019, and a refurbished older hull in this class is not a compromise.
Which Oasis-class ship is best for a short break?
Utopia of the Seas, which sails three- and four-night trips from Port Canaveral rather than the week-long itineraries the rest of the class runs.
The six Oasis-class ships are closer to each other than most people expect, and the real decisions are the ones underneath the hull name: which departure port saves you a flight, whether a suite is worth it, and what your balcony looks at. Those are answerable before you book.
Tell us who is sailing, where you are travelling from and what you want out of the week, and we will tell you which of these ships fits — including when the answer is a different class altogether. You can see the wider fleet on our Royal Caribbean page.