Avoiding the "single supplement"—the extra fee charged to solo travelers to cover the "lost" revenue of a second person in a cabin—requires strategic booking. In 2026, the most effective way is to book with cruise lines that offer dedicated solo cabins, such as Norwegian Cruise Line, Royal Caribbean (on newer ships), and Virgin Voyages. These cabins are specifically designed for one person and do not carry a supplement fee. Another tactic is to look for "Solo Traveler Deals" where lines like Holland America or Cunard waive the supplement during the shoulder season or on specific "repositioning" cruises. You can also utilize "Roommate Matching" programs offered by some lines, though this involves sharing a room with a stranger. For luxury seekers, many river cruise lines (like AmaWaterways or Tauck) frequently waive single supplements on European sailings to fill remaining capacity. Finally, working with a specialized travel agent who can track "Solo-Friendly" promotions can save you thousands of dollars, as these deals are often unadvertised and sell out extremely quickly.