On Royal Caribbean, infants under the age of 2 years (24 months) typically do not pay a base cruise fare, though they are still subject to mandatory port taxes, government fees, and gratuities. However, the most popular way for older children to sail without a base fare is through the "Kids Sail Free" promotional windows. In early 2026, these promotions often apply to children aged 12 and younger who are the third or fourth guest in a stateroom. It is important to note that even during these "free" promotions, every passenger on the ship's manifest must pay their share of non-commissionable fees, which can range from $100 to $300 depending on the itinerary. Additionally, infants must be at least 6 months old to sail on most routes (and 12 months for transoceanic voyages).