This study identifies women college engineering students' perception of online Science, technology, engineering, and mathematics (STEM) learning and factors that influence their learning motivation during the COVID-19 period. By conducting interviews with ten women engineering students and applying attention, relevance, confidence, and satisfaction (ARCS) model, this study aims to answer two questions: (1) How did women college engineering students perceive their experience with online STEM learning during the pandemic? (2) What category/categories based on ARCS motivational design model primarily account for women college engineering students' learning motivation with online STEM learning during the pandemic? The results show that the online learning format influenced women college engineering students' perception regarding their academic plans, learning styles, learning environments, peer learning, and learning satisfaction. The most influential categories from ARCS model were 'confidence' and 'attention'. Findings suggest that the online STEM learning format influenced women college engineering students' learning motivation. The online format led to (1) low expectations for attention category when analyzed using ARCS model, (2) anticipation of more self-control, and (3) a desire for more peer interactions in their online STEM learning. As students would have new expectations for the role of online learning due to their experience during the pandemic, assessing women students' emerging motivational needs for STEM online learning is critical in developing a more inclusive instructional system design process in the future.