Royal Caribbean just opened its Kids & Teens Sail Free offer for summer 2027, and for families it's the single biggest lever on a cruise fare. On select sailings, your third and fourth guests sail free on the cruise fare — regardless of age — and you cover only their taxes and fees, so a family of four books at two-guest pricing. It runs on departures between late May and late August 2027 across the Caribbean, Alaska, Europe and more, so you can build a trip around school breaks. The offer is combinable with onboard credit and member discounts, but the qualifying cabins are capacity-controlled and go first. Booking by September 14 locks it in before the best summer-2027 dates tighten.

Kids Sail Free is the deal I wait for every year, because it turns a four-person cruise into something a lot of families can actually swing. Tell me your kids' ages and the week that works, and I'll find the sailings where the free-guest cabins are still open — they don't last once summer itineraries get real. I'll also stack any onboard credit I can on top.