Bus transportation is growing popularity in tourism planning because expressway is increasingly linking to local’s top-sightseeing attractions. The existing studies focus fewer attentions on the evaluation performance of the public transportation service provider. Hence, this study addressed a case bus company selecting an appropriate operating route to concentrate business resources and promotional works through the Technique for order preference by similarity to ideal solution (TOPSIS) method. Each criteria weight setting and the best route selection fully consider the experts’ opinion simultaneously from public sector, transportation industry and academic organization. Finally, this study proved that TOPSIS can be utilized in the group decision topic of discussion and will be guided in the following related study.