Single supplements are being waived across a range of AmaWterways’ European river itineraries for bookings made by the end of March.
The offer applies to 39 European departures this year, including sailings on the Rhine, Danube and waterways in France.
The promotion applies to all cabin categories.
A seven-night Danube cruise from Budapest to Vilshofen, departing on August 7 on AmaSonata, now starts at £3,157 per person, down from £4,678, based on solo occupancy.
The company also continues to offer a limited number of specially designed single occupancy cabins with French balconies without supplements on several ships.
Sales director Andrea Stafford said: “River cruises offer an intimate welcoming environment, ideally suited to sociable single guests who want to travel through Europe in style.
“With no single supplements these sailings are ideal for agents to sell to their solo clients.”