When booking a cruise, one of the most mysterious and often misunderstood options a traveler encounters is the guarantee cabin (sometimes spelled guaranty cabin). It’s a term that sounds both promising and uncertain at the same time, as though you’re guaranteed something but also taking a gamble. Over the years, as we’ve sailed across oceans on various cruise lines, we’ve learned that a guarantee cabin can be a blessing or a mild disappointment, depending on your expectations and how flexible you are as a traveler.

A guaranteed cabin means you’re booking a specific room category— for example, inside, oceanview, balcony, or suite —but not choosing the exact location or cabin number. In other words, you guarantee that you’ll have at least that type of accommodation. Still, the cruise line has the right to assign you any available cabin within that category or even upgrade you to a higher one. The idea is simple: you’re trading control for value.

Cruise lines love guaranteed bookings because they give them more flexibility to manage their inventory. For instance, if certain sections of the ship need balancing for safety or operational reasons, or if they’re trying to sell more desirable cabins later at a higher price, they can shuffle guarantee guests around to fill the gaps. For passengers, the allure of a guarantee cabin usually comes down to price. These rooms are often cheaper than picking a specific cabin yourself, which appeals to those of us who prefer to save a bit for shore excursions, specialty dining, or perhaps a cocktail at sunset.

However, there’s always a catch. When you book a guarantee cabin, you won’t know your cabin number until closer to your sailing date, sometimes weeks before, sometimes even a few days. For travelers who like to plan down to the smallest detail, this uncertainty can be unsettling. We’ve known fellow cruisers who were assigned cabins in less-than-ideal locations: near elevators where late-night conversations echo through the corridor, under the pool deck where early-morning deck chairs scrape across the floor, or close to a crew service area where there’s a constant hum of activity.

But we’ve also met passengers who lucked out, getting unexpected upgrades to higher categories at no additional cost—say, from an interior to a balcony. Those moments feel like winning a little cruise lottery, and they do happen more often than one might think. Cruise lines prefer happy passengers, and if filling a better cabin makes sense logistically, it’s an easy gesture for them to make.

From a psychological standpoint, booking a guarantee cabin tests your comfort with uncertainty. As full-time travelers, Tom and I have learned to adapt to the unexpected—different cultures, languages, currencies, and accommodations, so a little unpredictability on a cruise ship doesn’t rattle us much anymore. In fact, there’s something oddly exciting about not knowing exactly where you’ll end up on board. It adds a layer of surprise, a small adventure before the bigger one begins. When the cabin assignment finally appears on your cruise app or booking page, it feels like unwrapping a gift.

That said, there are some practical considerations. If you’re particular about cabin location—say, you get seasick easily and prefer the middle of the ship on a lower deck where motion is minimal—then a guarantee cabin may not be wise. Likewise, if you’re a light sleeper or sensitive to noise, you might not want to risk being near high-traffic areas. In those cases, it’s better to pay a bit more and handpick your cabin.

On the other hand, if you’re simply thrilled to be sailing and aren’t fussy about where you lay your head at night, then the savings of a guarantee cabin might be worth it. After all, much of cruise life takes place outside the stateroom—on the decks, at shows, in restaurants, or exploring exotic ports of call. For some, the cabin is just a place to sleep between adventures.

On these three upcoming back-to-back cruises, for the first time, we booked a guarantee balcony cabin, not knowing where on the ship we’d be or whether we’d have to move twice. I hesitated when Tom suggested this during the cruise booking process a year ago, even with the over US $1000 in cost savings. But, I relented and said, “Let’s give it a try.”

Now, with only 12 days until boarding, we’ve been informed of our balcony cabin number and that we’ll be able to stay in the same cabin for the first and second legs of the back-to-back. We won’t be informed about the third leg for weeks, but if we have to move, it won’t be so bad, since we’ll be able to stay in the first cabin for the first 35 nights (out of 47). We are thrilled.

All in all, the unpredictability keeps travel from becoming routine. Much like flying standby or choosing a mystery hotel, the guarantee cabin is for those who can embrace a little chaos in exchange for potential reward. It’s about trusting the process and remembering that every cabin, whether inside or out, shares the same destination, the same ocean breezes, and the same star-filled nights.

If you decide to try a guarantee booking, it helps to understand the fine print. You can’t change your cabin once it’s assigned, and you can’t request a particular location in advance. The assignment is final, and that’s the trade-off for the lower fare. Some cruise lines assign guarantee cabins weeks before departure, while others wait until the last moment as they juggle cancellations and upgrades. Patience is key, and a positive mindset goes a long way.

For travelers like us, who’ve lived out of suitcases for years and learned to find comfort wherever we are, the guarantee cabin fits our philosophy: make the best of every situation. What matters most is the experience itself, the laughter shared at dinner at shared tables, the sound of the sea against the hull, the feeling of waking up in a new port with the world waiting just outside your door.

So if you’re planning your next cruise and debating whether to book a guarantee cabin, ask yourself this: Are you more excited by certainty or by surprise? Either choice can lead to wonderful memories. But for those who crave a touch of adventure even before stepping on board, a guarantee cabin might just be the perfect way to begin the voyage.

We’ll let you know what transpires for our third leg of the back-to-back cruise when we know sometime in the next several weeks.

Be well.

Photo from ten years ago today, October 15, 2015: