In the development of smart cities, technology plays a crucial role in shaping civilian life in multiple sectors like agriculture, healthcare, industry, education, transportation, etc. Smart city seeks a wide range of diverse applications, including media, surveillance, package delivery, and search and rescue operations. Unmanned aerial vehicles (UAVs) are visualised as a potential candidate technology for fulfilling smart city requirements. Thus, UAVs are poised to revolutionize global lifestyles shortly. Integrating UAVs into smart city frameworks holds immense potential and promising benefits, such as intelligent traffic management, media services, efficient surveillance, improved farming and healthcare systems, etc. This integration aims to achieve increased levels of efficiency, effectiveness, and innovation, thereby contributing to the advancement and sustainability of urban environments worldwide. The potential of UAVs to transform smart cities is significant, offering cost-effective solutions across numerous domains. These UAV applications require specific communication and spectrum requirements, catering to non-payload and payload services. On the other hand, quality of service (QoS), reliability, scalability, and security are the challenges associated with using UAVs for urban applications. Thus, choosing appropriate wireless communication technologies for UAV operations is essential. This chapter delves into the pivotal role of UAVs in the evolution of smart cities. To ensure seamless connectivity and security, the chapter discusses the technical aspects of integrating UAV communication to enable various smart city applications. The chapter candidly acknowledges the challenges associated with UAV communications, including connectivity, adaptability, safety, privacy, and reliability issues. Despite these challenges, the chapter provides valuable insights into current technological advancements and prospects for addressing these challenges, thereby optimizing UAV communications within smart city frameworks.