Fairfield Transportation Center. Access Via BART And Bus. Try North El Cerrito BART Station

If you're coming in from the direction of San Francisco, take BART to one of several BART Stations.

The part of the bay area, closer to the Bay, Richmond and El Cerrito offers two BART stations towards the end of their line. 

Richmond (BART station to Fairfield bus service), 

North El Cerrito BART Station https://www.bart.gov/stations/delnconnects by bus to Fairfield Transportation Center https://en.wikipedia.org/wiki/Fairfield_Transportation_Center), 

We prefer the North El Cerrito BART Station