This paper has as purpose to establish the rise of a new exception to the relativity effect on contracts by the analysis of the allied contracting figure applied to package tourist contracts held in Colombia. For it, it will be firstly done an approach to the relations established in the allied contracts conclude between entrepreneurs and users. Secondly, a characterization of the tourist package contract in Colombia will be presented. To conclude thirdly with an analysis of the relativity effects arisen on allied contracts for tourist services. This article contains a qualitative documental research that favors the use of primary sources of information, whereby is presented the complexities of this phenomenon on contemporary private contracting, the discussions about the reach of effects on tourist services contract and the tendency that exist towards a major protection of the users and consumers that could be creating a new exception to relativity effects on contracts.