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In this paper, we present a comprehensive framework, which we call VKG-UI, for realizing ontology-based reusable user interfaces (UIs) for data access via virtual knowledge graphs (VKGs). The VKG approach uses an ontology to model the domain of interest and to hide the heterogeneity of the underlying data sources. Reusable UIs can be built by relying on queries that are issued to the VKG system and that use the high level vocabulary from the ontology layer. This use of VKGs allows for decoupling the data from the UIs, and brings great reusability in designing the latter. To illustrate our approach, we introduce significant use cases with various types of UIs, including programming, graphic, natural language, and voice interfaces.