The article aims to present the scope of influence of Integrated Territorial Investments (ITI) on the sustainable development of urban functional areas (FUAs) in Poland. Against the background of the general principles of the implementation of the both instruments, practical aspects of the implementation of ITI in FUAs have been presented. Detailed analyses in the financial and spatial aspect were carried out using the Sustainable Development Indicators (SDI). These provided the basis for presenting the practical aspect of supporting the sustainable development of urban functional areas in the EU Cohesion Policy 2014–2020.