The purpose of this study was to examine the relationship between service quality, perceived value, and customer engagement in the context of long-haul routes of low-cost airlines, and to develop marketing strategies suitable for the domestic situation to gain a competitive advantage in the competition with major airlines on long-haul routes. A survey was conducted targeting passengers who have experience using long-haul routes of low-cost airlines, and the analysis results revealed support for all hypotheses except Hypothesis 1-1, which examined the impact of tangibility on perceived value. First, among the service quality dimensions of low-cost airline long-haul routes, convenience and affordability were found to have a positive impact on perceived value, while tangibility did not have a significant impact. This suggests that customers of low-cost airlines value direct benefits more than indirect benefits. Second, perceived value was found to have a positive impact on customer engagement. To encourage customers to participate voluntarily in purchasing airline tickets from low-cost airlines and to promote positive word-of-mouth, it is important to stimulate customer voluntary participation through the promotion of events and advertising campaigns promoting the airline’s long-haul routes.