Some of the cruise lines will list their repositioning cruises in their brochures. They may not always be listed as a repositioning cruise though. When a ship is doing Alaska from mid May through mid September, then it's next cruise is going from Vancouver down to Los Angeles-that's a repositioning. Or when a ship is doing a one time cruise from San Diego through the Panama Canal to Miami. Other examples are the spring and fall Transatlantic cruises or a ship doing Canada/New England all summer long then working its way back to Caribbean for the winter. You may be able to find repositioning cruises on some of the major cruise booking websites under the "Region or Destination" block. They may have the word "Repositioning" actually listed under a destination/region. Any good Travel Agent should be able to help you distinguish repositioning cruises also.