San Francisco Flex Academy is a tuition-free public charter school for students in grades 9-12. This is one of California's first, full-time hybrid schools. It exclusively uses curriculum developed by the for-profit online curriculum organization, K12 Inc. Core subjects are English, math, science and history. Students can take electives that include art, technology, world languages, anthropology, and journalism.
Here's a report from the Innosight Institute on the Flex Academy's blended learning program.