Solo cruisers, who are usually charged for two people even though they're traveling alone, can catch a break with some companies that are waiving the additional charge this year and next.
European Waterways, which runs hotel-style barges on Europe's rivers, announced last week that it is eliminating the double occupancy requirement in a nod to the growing popularity of traveling solo.
Among the destinations served by the line are France's Burgundy region, Scotland's Caledonian Canal and Italy's Po Valley and Venice.
Tauck plans to waive the single supplement charge on its European river trips in 2018, offering "savings of up to 50% for solo travelers."
The solo travel market is booming, and many large cruise lines are trying new ways to target the market by adding special cabins for one, offering to match roommates and staging events that make mixing and mingling easier. Norwegian Cruise Line led the way in 2010, introducing studio rooms with full-size beds for singles.