Urban green spaces contribute positively to the quality of life and well-being of city residents. However, urban space is limited for the development of parks, especially in central areas of the city. Major streets or avenues in city centres, where people spend part of their time, tend to have a high volume of road traffic. The functionality of these urban roads and the urban features where they are located often complicate the development of efficient actions for the reduction of road traffic noise. Some of these important avenues have central linear green areas which in some cases have great historical value and botanical diversity and where different cultural and leisure activities take place. The “Paseo de Cánovas” (Cáceres, Spain) and the “Alameda Bernardo O'Higgins” (Talca, Chile) are two examples of such linear green areas. The perception of the sound environment in these two urban environments was analysed in this study. First, the influence of different environmental characteristics, including the sound environment, on the satisfaction with these urban green areas was studied. Then, the characteristics of their sound environment were analysed and compared with other similar locations on urban roads of similar functionality but without green areas. The results show that the noise environment is a feature to be considered in the analysis and design of urban spaces because of its relationship with overall satisfaction. Green spaces had a similar positive effect in the studied cities from countries located in different geographical areas on the perception of road traffic and overall annoyance.