Blended learning, the combination of traditional face-to-face instruction with online learning environments, has gained significant attention in the field of English as a Foreign Language (EFL) and English as a Second Language (ESL) education. This article aims to investigate the effectiveness of blended learning models in EFL/ESL contexts and identify optimal combinations of in-person and online interactions. By reviewing relevant studies and examining key components of successful blended learning models, this research sheds light on the potential benefits and challenges associated with implementing blended learning in language education. Keywords: blended learning, face-to-face instruction, online learning, EFL, ESL, language learning outcomes, learner engagement