According to wayfinding approach, it was found the existents problems on three airports terminals. Field research was based on two main techniques: observation and interviews. It became clear that communicational dimension f the built environment is the base for the relationship between environment and the user, and the spatial navigation. The airport terminals description shows the relevance for wayfinding questions concerning the global air transportation. After the literature review became evident that to aim the best efficiency in wayfinding design the informational systems must be together. Besides that the built environment must interact with the user and organizational aspects. This must be an important criterion for built environmental designers. The results and their analysis point out that the three terminals present orientability problems in their informational systems. In some of them inadequacies are more expressive in the architectural design, other in the objects, and other in additional information, mainly in signing systems.