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Blended learning is believed to improve students’ understanding in learning second language. The employment of offline and online activities is expected to give better outcome than the traditional face-to-face activities. This article presents how blended learning was applied in an English grammar class and whether it significantly improved students’ achievement after the treatment. The participants involved in this research were 26 students of the the second semester students of the English Letters Department, Sanata Dharma University. A pre-experimental research was conducted by comparing the means of the participants’ scores in both pre-test and post-test. The analysis figured out that there was a significant improvement, proven by the paired t-test analysis. The p-value 0.00 was less than alpha 0.05. This research concluded that blended learning was effective to assist the students to learn English grammar. To strengthen the findings, this research also involved pre-questionnaire and post-questionnaire to understand students’ responses on the use of blended learning. In the end of the semester, most students found that online activities help them comprehend and practice the materials. Students’ reflective journals also revealed that blended learning was able to improve their understanding and interest in learning English grammar.