The topic of this paper is the legal and theoretical framework, and analysis of court decisions related to flight risk as a basis for pre-trial detention. The paper begins with an introduction to the establishment of pre-trial detention, its conceptual definition, historical development followed by relevant legal sources. The paper further explores the significance of the principles of proportionality and presumption of innocence in the application of pre-trial detention. Subsequently, an overview of the legal basis for ordering pre-trial detention is provided. The focal point of the paper revolves around flight risk as the basis for determining pre-trial detention. Primary focus is placed on relevant case law regarding determination and extension of pre-trial detention based on flight risk. It references to the standards of legal aquis set by the European Court of Human Rights in Strasbourg and to the fundamental constitutional and legal principles. The paper especially emphasises and elaborates on decisions concerning foreign nationals and individuals known to public. Finally, it provides alternative measures that can be implemented to ensure the presence of the defendants during the criminal proceedings.