This study’s major objective was to assess how employee grievances influences performance of commercial airlines in Kenya: a case study of KQ. With specific objectives to; evaluate how organization culture influences performance of commercial airlines in Kenya, determine how employee motivation influence the performance of commercial airlines in Kenya and to assess how employee working environment influences performance of commercial airlines in Kenya. This study adopted a descriptive case study research design to obtain data from 258 respondents who were stratified sampled from senior, middle and operational management level, from a targeted total population of 2584 at KQ. Structured questionnaires were administered to respondents through e-mail addresses and data obtained was analyzed using descriptive and inferential analysis methods. To determine the pattern of the variables, descriptive statistics used for example mean and standard deviation. SPSS was utilized for data analysis. The obtained data was presented on graphs, tables and charts for interpretation. The regression of coefficients results revealed that the three indicators of employees’ grievances including organizational culture, employee motivation and working environment were positively and significantly related to performance. The study concluded that identifying employee grievances and improving or resolving them enhance performance. Commercial airlines in Kenya should ensure employees’ satisfaction in order maximize their output towards achieving targets, and periodic audits and evaluation on organizational culture, working environment and motivation.