This study aims to analyze the influence of perceptions of price, convenience, security, and trust in purchasing decisions of e-commerce-based service companies on the Traveloka website. The subjects in this study were all Muhammadiyah Yogyakarta University students who had made transactions at least once in the last year on the Traveloka website, and were at least seventeen years old. This research was conducted with a total sample of 105 respondents. The sampling technique uses a nonprobability sampling type with a purposive sampling method. The analysis technique used in this study is multiple linear regression. The results of this study indicate that price perceptions have a positive and significant effect on purchasing decisions, convenience has a significant positive effect on purchasing decisions, security has no influence on purchasing decisions, and trust has a positive and significant effect on purchasing decisions