This study aims to determine whether there is any relationship between working capital management and firm profitability in airline companies and, if so, in what direction. In this study, the top ten airline companies according to the value of the stock market in 2023 (Delta Airlines, Ryanair, Southwest, Air China, United Airlines, Singapore Airlines, China Southern, Turkish Airlines, China Eastern, and Indigo) were selected as a sample. The research period is based on the last 5 years (2019-2023). The fact that this period includes the period of the COVID- 19 pandemic has made the analysis more sophisticated. In this study, the return on assets was determined as the dependent variable. In contrast, the independent variables were determined as the current ratio, the cash ratio, the current assets/total assets ratio, working capital turnover, shortterm debt servicing period, cash conversion cycle, and size. The study found that the effective use of working capital elements has a significant impact on return on assets. The study contributes to the literature, as it is among the rare studies that examine the efficiency of working capital of airline companies during the COVID-19 and post-COVID-19 periods.