For a 7-day cruise in 2026, the average cost for a standard "Mainstream" line (like Royal Caribbean, Carnival, or NCL) typically ranges between $1,200 and $1,800 per person, based on double occupancy. This estimate includes the base fare, mandatory port fees, and taxes, but excludes gratuities (which now average about $16–$20 per day) and "extras" like Wi-Fi, alcohol, and shore excursions. Budget-conscious travelers can find "Inside" cabin deals as low as $700–$900 during shoulder seasons like September or early January. Conversely, "Premium" lines like Celebrity or Virgin Voyages usually start closer to $2,000, and ultra-luxury or expedition cruises can easily exceed $5,000–$7,000 for a week. When budgeting, it is wise to add approximately 30–40% to the advertised "lead-in" price to account for the true total cost of the vacation once onboard spending is finalized.