This article reports on an exploratory case study that applied the Community of Inquiry framework in the K-12 Philippine setting, where there are limited studies on blended learning interactions and experiences. The study examined blended learning interactions across three schools in the Philippine K-12 system to investigate the following: (1) what is the nature of interactions in the blended learning classes? and (2) how do the interactions indicate learning communities as outcomes of blended learning? A mixed method approach to data collection was undertaken, which included student surveys, focus group discussions, teacher interviews, and class observations. The constant comparative analysis uncovered thick descriptions of blended learning interactions. Findings uncovered three themes on blended learning across levels of interactions within the Community of Inquiry presences: (i) best of both worlds, (ii) learning anytime and anywhere, and (iii) learning with technology. Descriptive statistics indicated high mean ratings across the presences, revealing positive experiences afforded by the use of various technologies and social media. The study concluded that learning communities are an outcome of blended learning interactions. A Developmental Model for K-12 Blended Learning Communities was recommended to inform teacher professional development on pedagogies and practices supportive of learning community building in contexts where blended learning may continue to thrive.