Extensive Reading is the reading activity that is useful for the students especially for language learners. In English Language Education Department at private university in Yogyakarta, most of the students have already done extensive reading activity in English which is reading for hobby or reading with no academic purposes just for pleasure. Some students of English Language Education Department use the Internet as the media for doing extensive reading. The aims of this research are to discover the benefits and the challenges perceived by the students while doing online extensive reading in English. This researcher used three participants which were students of English Language Education Department at private university in Yogyakarta. First participant is I, 20 years old male student who study in English Language Education Department from batch 2014. He likes to read short online article, online news about football and music, and online mini biography in English. Second participant is L, 20 years old female students from batch 2014. She likes to read online novel about science fiction and horror, and online short article in English. Third participant is M, 19 years old female student from batch 2015. She likes to read online novel online magazine about Hollywood and football, online novel, and online short story in English. The research used the interview to gather the data needed for the completion of this research. The result of interview revealed that there are two findings in this research which are the benefits and the challenges of online extensive reading. Fist, the benefits were categorized into 3 categories. Based on the data, the benefits divided into 3 part as follows: practicality, resourcefulness, and linguistic benefits. The second result was about the challenges of online extensive reading. The researcher divided the challenges into 2 categories which were mentioned by participants as follows: technical difficulties and linguistic difficulties. In conclusion, the online extensive reading has some benefits which are useful for the student in process of English learning. However there are some challenges which are found in this research.