Before arriving in a host country, international students may be motivated to complete some institutional requirements online. Many studies address computer-assisted instruction for second-language students, but few focus on fully online English for Academic Purposes (EAP) writing courses. This comparative case study, grounded in action research, examined the extent to which a fully online version of a graduate-level EAP course offered to international students at a North American university achieved comparable outcomes to a face-to-face version. A quantitative and qualitative analysis of study participants' performance and course evaluations indicated that the outcomes and student satisfaction of both cohorts were comparable. However, an examination of the participants' final research papers and online interactions revealed differences and challenges. Based on these findings, it is recommended that future online courses provide more instruction on source integration, library research, and building an interactive learning community. Overall, the findings suggest that when carefully designed, assessed, and refined, fully online courses hold strong promise in EAP academic writing contexts.