In this thesis administration application and web site for travel agency has been built. To understand the scope of the application and web site, an analysis of similar web sites and applications has been conducted. Administration application has been developed for quick and efficient web site managing, handling online reservations and simple trip management. System was built using ASP.NET MVC 5 and jQuery UI library. Database communication was realized using Entity Framework 6. During the development I used Code First technique, which allows developer to generate database from application data model. The thesis is divided into ten chapters. First chapter gives some basic insights into principles and demands of tourist agency. Second chapter describes alternative solutions on the market. In third chapter I specify demands for the built application. In fourth chapter there is technical specification, while in fifth chapter I describe the data model. Sixth chapter is all about programming and code snippets from built application, while in seventh and eighth chapter I describe functionality of built application with some illustrated examples. Critical review of built solution is given in ninth chapter and conclusion is in tenth.