[joshAg]

FYI, bart starts running at 4am, and google maps is pretty good at giving public transit direction in the bay area. the only caveat is to choose when you want to arrive as opposed to depart (duh), and if you plan to drive part way, choose the start to be where you start taking public transit.

[madcaptenor]

BART starts running at 4 AM - but that's at the terminus, which is Pittsburg for trains going to SFO. The first train doesn't get to the airport until about 5:30.

(I know this from a painful morning where my wife missed a 6 AM flight.)