Single travelers are usually hit with a "single supplement" to the base price for package vacations and cruises, while the price of a single room is almost always well over half that for a double. To avoid such charges, you might consider agreeing to room with other single travelers or to find a compatible roommate before you go from one of the many roommate locator agencies.
Travel Buddies Singles Travel Club (tel. 800/998-9099; www.travelbuddiesworldwide.com), based in Canada, runs small, intimate, single-friendly group trips and will match you with a roommate free of charge. TravelChums (tel. 212/787-2621; www.travelchums.com) is an Internet-only travel-companion matching service with elements of an online personals-type site, hosted by the respected New York-based Shaw Guides travel service.
Many reputable tour companies offer singles-only trips. Singles Travel International (tel. 877/765-6874; www.singlestravelintl.com) offers escorted tours to places like the Greek Islands. Backroads (tel. 800/462-2848; www.backroads.com) offers "Singles + Solos" active-travel trips to destinations worldwide.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.