It’s been a badly kept secret, but Megabus is returning to California later this year. Megabus originally entered the California market in 2007, but left in mid 2008 due to poor ridership. Believe it or not, but Megabus served California before they began operations in the northeast corridor, which is now their strongest market.
Back in 2007, service was focused on LA, with routes to Vegas, San Francisco, Phoenix and San Diego. The Central Valley was not served, as the buses used I-5 to express between LA and the Bay Area. Megabus was unhappy with ridership, and took all their buses east.