One of the challenges for the successful implementation of extensive reading (ER) programmes, especially in Asian contexts, stems from curricular factors where class time is often prioritised for tasks requiring the presence of a teacher. This paper investigates the role of extensive reading online (ERO), an alternative approach to traditional ER, in enhancing first-year university students' reading fluency and their attitudes to reading in an English as a foreign language (EFL) context. Seventeen English learners from a university in Vietnam participated in the 10-week study. The findings revealed that the ERO programme had a generally positive impact on the development of learners' reading fluency with conservative analysis methods showing increases of around 20% in reading speed. Evidence from qualitative data gathered through questionnaires and interviews showed that there were positive changes in participants' attitudes toward ER and provided insights into implementing ERO.