Recently, Web services considered to be a new and important approach in the distributing of services/applications. Web services can be defined as internet-based applications achieving a specific job or a set of jobs that can be merged with other Web services to preserve workflow or business dealings. The architecture of web services is collections of conceptual components in which common sets of standard can be defined among interoperating components, working on diversity frameworks and platforms. The Web services reference architecture is revolved around three components: Service provider, Service registry and Service requester, each of these components has its own role in the architecture of web services. Therefore, this paper aims to propose an architecture model for flight booking system depend on Web services, it can serve as a guideline for online flight booking application for end users to book flight tickets. It can be concluded that this model generally has a moderate strength and is seen as a practical guide for researchers.