Purpose Little empirical research has examined the role of culture on the internal marketing-employee satisfaction (ES) relationship, and even fewer studies focus on this subject in the airline sector. This paper aims to assess whether culture moderates the contribution of internal marketing to the satisfaction of employees from Gulf Cooperation Council (GCC) airlines. Design/methodology/approach The investigation is conducted via a structured questionnaire with 310 cabin crew members who work at three GCC airlines. Multi-group analysis was used within SmartPLS 3.0 to measure whether the impact of internal marketing on ES is moderated by cultural congruence. Findings The results reveal the practice of internal marketing contributes to ES in GCC airlines, while cultural congruence moderates the direct relationship between internal marketing and the satisfaction of airlines’ employees. The results indicate that airlines need to satisfy the cultural needs of employees to increase their satisfaction for successful internal marketing practice. Originality/value This study contributes towards assessing the moderation effects of cultural congruence on internal marketing practice in the airline sector. It contributes to the current literature on aviation research, as well as specific managerial implications for the airlines and managers to achieve higher competitiveness.