Solo river cruise pricing is a moving target. Headline brochure fares are quoted per person assuming double occupancy; a solo guest paying for a standard cabin will typically pay between 100 percent and 200 percent of that fare as a "single supplement". A handful of operators have built genuine solo cabins or run regular zero-supplement promotions; others have not.
Riviera Travel has the most consistent solo offering in the European market. Every ship in the Riviera fleet — Lord Byron, William Shakespeare, Jane Austen and the others — has a block of dedicated 100-square-foot single cabins on the lowest deck with a fixed window. These cabins are sold at no single supplement on every published sailing.
Avalon Waterways sells its standard 172-square-foot Deluxe Stateroom on the Indigo Deck (lowest deck) at no single supplement on roughly half of all departures. The supplement-free dates are flagged on the Avalon website. Suites and Panorama Suites are not eligible.
Tauck publishes a solo-traveler price for every sailing. The supplement on a Category 1 cabin runs roughly 25-40 percent above the per-person double rate — the lowest in the luxury segment.
A-ROSA sells some of its cabins as "single occupancy" with no supplement on selected sailings, and runs occasional zero-supplement campaigns covering most of the fleet.
Viking charges a 25-100 percent supplement depending on cabin and date. Veranda and higher categories are generally subject to the higher supplement; Standard Stateroom solo fares are typically the most workable.
AmaWaterways, Scenic, Emerald, Uniworld, Amadeus and CroisiEurope charge a 50-100 percent supplement on most sailings, with periodic promotional reductions but no dedicated solo cabins.
Practical guidance: if budget is the controlling factor, Riviera Travel is the structural answer. If you want a mainstream brand, watch the Avalon supplement-free calendar. If you want a luxury product, Tauck has the most-predictable solo pricing. Always price the entire trip including airfare — a higher cabin fare with included air can be cheaper than a "no-supplement" cabin without it.
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