866-227-1888 is the line I called when I wanted to jump on 2026 itineraries early. Carnival usually releases sailings about 18–24 months ahead, sometimes even earlier for popular ships. When I called, the rep told me the exact release week and even suggested joining the waitlist so I’d be notified immediately. It paid off — I booked a prime cabin before prices climbed. If you’re cruising during holidays or on new ships, booking early is honestly the way to go. Those cabins disappear fast, and the introductory rates are usually the cheapest you’ll see.