It's not too late to sail on TikTok's favorite 9-month Royal Caribbean Ultimate World Cruise — but it won't be cheap

• It's not too late to join Royal Caribbean's Ultimate World Cruise. 
• Parts of the nine-month itinerary's upcoming segments can still be booked.
• But there's a catch: Your favorite cabins could already be reserved.

It's not too late to join the cast of Royal Caribbean's Ultimate World Cruise, turned what The New York Times has deemed "TikTok's favorite new reality show."

TikTok has become obsessed with Royal Caribbean's nine-month around-the-world cruise since it embarked in December 2023. And for good reason: Its operator has touted this as one of the longest global sailings on the market. Through September 10, the Serenade of the Seas and its globetrotting travelers are scheduled to stop at more than 150 destinations across 65 countries.

TikToks about the Ultimate World Cruise have since received millions of views. And it seems like everyone on TravelTok has been keeping a close eye on these seafarers, eagerly awaiting updates about the potential drama at sea.

If you're one of the many people captivated by this nine-month cruise, you too can join the sailing.

But to do so, it won't be cheap.

Despite cruise line President and CEO Michael Bayley's previous predictions, the world cruise has yet to sell out.

When it was first unveiled, the nine-month itinerary could be booked in four monthslong segments. The first is already underway. On Monday, a reservations representative told Business Insider that the second is now sold out.

But the third and fourth segments, the "Ultimate Middle East and Mediterranean" and "Ultimate Europe and Beyond" itineraries, respectively, are still available to book. Both are 63 nights.

A handful of the grand suites, interior, oceanview, and balcony cabins are available on the latter half of the itinerary, the representative said. The most expensive owner's suite is on the market as well. (Royal Caribbean did not respond to Business Insider's request to confirm this.)

Still, it won't be cheap: The least expensive interior stateroom starts at over $16,850 per person for the fourth segment, the representative told Business Insider. Broken down, it'll be almost $270 per day for a windowless cabin, a price comparable to nicer cabins on premium cruise ships.

If several months at sea still seems too long, travelers can also join shorter legs of the Ultimate World Cruise ranging from nine to 29 nights, starting at over $1,760 per person.

Besides Royal Caribbean, operators like Regent Seven Seas Cruises and Azamara also operate world cruises, albeit more expensive and much shorter.