No, kids do not always sail free; "Kids Sail Free" is a promotional offer rather than a permanent feature. In 2026, lines like Royal Caribbean and MSC Cruises frequently run these deals, but they are almost always subject to "blackout dates" during peak holidays like Spring Break, Christmas, and mid-summer. Even when the fare is "free" ($0), parents must still pay taxes, port fees, and gratuities for the child, which can easily total $200–$400 depending on the itinerary. Furthermore, the offer usually only applies when the child is the third or fourth guest in a cabin with two full-fare-paying adults. If you are a single parent traveling with one child, the child will almost certainly be charged the full adult rate. Always check the fine print for age limits—most "Kids Sail Free" promotions in 2026 are capped at children aged 12 and under, though some lines occasionally extend this to age 17.