In Korea, the government has been promoting cultural tourism festivals since 1995 and many cities utilize a local festival as a main tourism strategy to attract tourists to a city nowadays. However, local festivals have faced a challenge of its uniqueness and attractiveness because a lot of local festivals provide similar programs and fail to show authenticity. This study aims to examine the relationship between authenticity, flow and satisfaction in cultural tourism festival in order to investigate the importance of authenticity to festival visitors especially in traditional cultural festival settings. Data were collected from the visitors of Yeongju Seonbi Culture Festival, and a total of 127 responses were analyzed to test four hypotheses. The results show that festival authenticity, both objective and existential authenticity, positively affects festival flow, and also positively affects satisfaction. Second, the festival flow has a positive impact on satisfaction. Finally, the mediating effect of festival flow on the relationship between authenticity and satisfaction was confirmed. The practical implications for festival planners and marketers of a cultural tourism festival and academic implications were discussed.