At 250,600 tons, Icon of the Seas will be more than 6% bigger than Wonder of the Seas, the biggest Royal Caribbean ship currently at sea. It'll hold up to 7,600 passengers — a new record for a passenger ship. That's about 7% higher than the maximum capacity of Wonder of the Seas, which can hold up to 7,084 passengers.

As of 2026, the largest passenger capacity in the Royal Caribbean fleet is held by the Icon of the Seas and its sister ship, Star of the Seas. These "Icon Class" vessels have a staggering maximum capacity of 7,600 passengers when every berth is occupied, though their "double occupancy" (standard) capacity is approximately 5,610 guests. In addition to the passengers, the ships carry a crew of about 2,350, meaning there can be nearly 10,000 people on board at any given time. These ships are designed as "all-in-one" vacation destinations, featuring 20 decks, 7 pools, and the largest waterpark at sea. For comparison, the older "Oasis Class" ships like Wonder of the Seas have a slightly higher double-occupancy capacity (5,734) but a lower absolute maximum capacity than the Icon Class. This massive scale ensures that Royal Caribbean remains the global leader in "mega-ship" cruising, offering an unprecedented variety of neighborhoods and thrills for travelers of all ages.