Transportation

Rental car information to/from San Francisco Airport can be accessed here:
http://www.flysfo.com/web/page/tofrom/rental-cars/

Rental car information to/from Oakland Airport can be accessed here:
http://www.flyoakland.com/car_rentals.shtml

Rental car information to/from San Jose Airport can be accessed here:
http://www.sjc.org/travelers/rental.html

It is quite easy to use public transit to reach Stanford campus from a variety of airports.  The BART connects directly to both San Francisco Airport and the Oakland Airport. 

From SFO:
Take the BART one stop, whereupon you can switch to the Caltrain.  The BART connects to the Caltrain at Millbrae Station.  Ride the Caltrain until the Palo Alto Station. This will put you at the entrance to Palm Drive, whereupon one can ride the free Marguerite shuttle bus into and around campus, or enjoy a brisk walk into campus.

Location of BART station in SFO:
http://www.flysfo.com/web/page/tofrom/transp-serv/pubtrans/bar-pickup.html

From OAK:
Take the BART all the way into San Francisco, and the south to the Millbrae Station, whereupon you can take the Caltrain to the Palo Alto Station.

Location of BART station in OAK:
http://bart.gov/stations/cols/index.aspx

From SJC:
Take the VTA Airport Flyer shuttle bus (VTA #10) to the Santa Clara Caltrain stop; there are frequent trips.  From there, head north towards San Francisco and get off at the Palo Alto Station.

Additional information is located here:
http://www.sjc.org/travelers/public.html

Schedules, fares, and other additional information about public transit:
 
BART schedules and information:
http://www.bart.gov/

Caltrain schedules and information:
http://www.caltrain.com/