This study explores the development prospects of tourism in predominantly industrial small-sized cities (SSCs), focusing on the integration of tourism into urban planning and sustainable practices. Using structural equation modeling (SEM) to analyze survey data from SSCs in Serbia and Russia, the research identifies key factors contributing to urban tourism sustainability. The analysis reveals the significant roles of environmental, economic, social, and cultural indicators in promoting sustainable urban tourism. The importance of inclusive development and community engagement is also highlighted, underscoring their impact on sustainability. The findings offer theoretical insights and practical recommendations for effectively incorporating tourism into urban planning to achieve comprehensive sustainability in SSCs.