Seasonal retired migrants have increased rapidly in developing countries in recent years. This article adopts a relational perspective to understand the relationships between older people's seasonal mobility and well-being. It shows that the complex spatiotemporal dynamics of seasonal mobility and the non-western sociocultural context influence older people's relations with their places of origin and destination, which in turn shape their well-being experiences during seasonal mobility. Narrative analysis of interview data from five pairs of 'snowbirds' to Sanya, China, reveals that seasonal mobility and well-being of older people are evolving processes, interwoven with risks and opportunities. Older people construct routinized daily activities, stable social relations, and peer-supporting and active-aging environments in their place of destination to maintain short-term well-being. However, they encounter difficulties in integrating the corporeal and social dimensions of their bodily experiences and constructing long-term well-being due to their separations from their lifelong relations in their places of origin. But overall, seasonal mobility creates alternative options for aging across multiple places and promotes leisure-oriented aging life.