Air pollution from the shipping industry is an ongoing problem that requires exploring innovative technologies for effective resolution. The integration of wind-assisted ship propulsion (WASP) technology offers a promising route towards decarbonisation of the shipping industry. The paper investigates possible fuel savings and CO₂ reduction by implementing wind assisted propulsion on a case-study vessel operating on a known route in the Adriatic Sea. The long-term contribution of added wind propulsion is analysed by implementing a Velocity Prediction Program (VPP) and available meteorological data for the area of interest. VPP is modified to predict the contribution of wind propulsion to the overall propulsion necessary to achieve the vessel design speed. The case study quantifies long-term fuel savings for ship operating a liner route and harnessing favourable (predictable) north-west winds, complementing the conventional propulsion systems.