The Biggest Cruise Ship 2025 Size. All of the biggest cruise ships are owned by royal caribbean international. Icon of the seas measures an astonishing 250,800 gross registered tons and can carry a maximum of 7,600 passengers, making icon roughly 6% larger than wonder of the.

Ranked in order of size in 2025 here is the. Miami (ap) — the world’s largest cruise ship — the size of almost four city blocks — is set to begin its maiden voyage saturday as it leaves from the port of miami.