"Repositioning cruises"—when ships stationed in the Mediterranean in the summer move to warmer Caribbean waters in the winter—used to be the rare way to find a deal on a luxury line. Now, as companies expand their itineraries across the globe, one-way cruises, another alternative, are also growing. Crystal Cruises, Regent Seven Seas Cruises, and Yachts of Seabourn are some of the lines that offer one-way routes from New England to Montreal, from British Columbia to Alaska, and even from Los Angeles to Australia. Regent Seven Seas (877/505-5370; www.rssc.com) has a one-way, 14-night cruise from Seward, Alaska, to Osaka, Japan, aboard its Seven Seas Mariner for $5,695. And this winter, travelers can buy a single 12- to 22-day leg of Crystal's 106-day, 46-port, globe-spanning Full World Cruise (888/722-0021; crystalcruises.com), starting at $5,895. According to Bob Sharak, executive vice president of the Cruise Line International Association, 50 percent of all Alaska itineraries are now one-way: "People are catching on and these [trips] are selling out."