San Jose International Airport is the nearest airport at about 18 miles southwest of the Stanford Campus.
San Francisco International Airport is approximately 28 miles north of the Stanford Campus.
Oakland International Airport is approximately 30 miles to the northeast of Stanford Campus.

Ground Transportation web site at San Francisco Airport
Super Shuttle
(650) 558-8500
$26.00 ($8.00/ea. additional person) one-way. Pick-up is on upper level by US Air. Runs 24 hours a day. Reservation required on return trip to the airport. (3 stop max per shuttle trip).
Sam Trans Bus
(800) 660-4287
$1.10 one-way. Pick-up is upstairs on departure level near United, or in front of International terminal. Take Bus #KX to Stanford Shopping Center. Take Marguerite shuttle line A (free) to campus; runs Monday-Friday only, 6am - 7:45pm. Bus leaves airport every 30 minutes and take approximately 55 minutes.
Cab Service
(650) 361-1234
Pick-up outside baggage claim area of airport. From Stanford to SFO, you must call and give your name, the airline, flight # and departure time.
Cal Train
(800) 660-4287
Millbrae Station to University Avenue Station in Palo Alto. Take the SFO-Cal Train Shuttle from SFO to Millbrae Station. Train hours: M-F 5:20 am to 12:20am. Free Marguerite Shuttle from University Avenue Station to Stanford during commuter hours.
Barron Limousine
(408) 257-7794
24 hour advance reservations recommended

Ground Transportation website at San Jose Airport
South Bay Airport Shuttle
(800) 548-4664
$18.00 ($6.00/additional person) one-way, door-to-door to/from airport terminal. Pick-up is outside baggage claim.
Santa Clara County Transit
(800) 894-9908
Take bus #10 to the Santa Clara Train Station (free); then take bus #300 or #22 to the Palo Alto Train Station; then take #86 into Stanford. Buses run approximately every 30 minutes.
Yellow Cab
(650) 361-1234
$58 approximately to Stanford one-way.
Cal Train
(800) 660-4287
Santa Clara Station to University Avenue Station, Palo Alto.
From SJO, take bus #10 (free) to Santa Clara Station.
Free Marguerite Shuttle from University Avenue Station to Stanford during commuter hours.

For those interested in renting a car: