Students’ engagement in reading combines students’ motivation, effort, emotion, and ability to gain flow in reading. It is the key to help students love reading and gain their students' academic achievement. This qualitative study aims to identify the types of engagement that the students experienced in extensive reading and factors that make students engaged in reading English materials in a EFL context. This study was held in English Department at one of universities in Yogyakarta, Indonesia. As data collection techniques, reflection and interview were conducted to six students who enrolled a class that was implemented extensive reading. The students’ reflective essays were used as the main data to explore engagement that the students experienced in reading. In order to further the exploration, important statements appearing in the essay were confirmed and explained by the students through one on one interview. From the data, it was revealed that students experienced behavioural and emotional engagement when reading English books. Behavioural engagement was shown from students’ attempts to make time to read and finish their chosen books while the emotional engagement was identified from students’ positive feeling in reading that they wrote in the reflective essay. Furthermore, factors that made students more engaged in reading their books are their motivation, relevant reading materials, and influences from peers and teachers. Pedagogical implications and limitations are also discussed.