San Francisco Bay Area Airports
Oakland and San Jose tend to offer more discount airline flights, while San Francisco Airport attracts more international flights and can be more convenient for those staying in the city. Private pilots should consider Oakland (ICAO: KOAK) rather than SFO, as the separate general aviation field there is more accommodating to light aircraft.
Public Airport Transportation
San Francisco and Oakland Airports are connected to downtown SF by the Bay Area Rapid Transit (BART)  system (Oakland Airport indirectly through an AirBART shuttle buses). Although convenient, BART is showing its age, with loud screeching noises in certain track sections due to resonance effects.
Passengers arriving in SFO can walk (5 minutes from United’s domestic terminal) or take a free airport shuttle (AirTrain) to the BART station (which is adjacent to the G side of the International Terminal). The BART ride from SFO to San Francisco costs about $8 one-way and runs frequently, every 15 or 20 minutes depending on the time of day. BART trains run through San Bruno, South San Francisco, Colma, Daly City before reaching the city of San Francisco, from where the SF MUNI  can take travelers anywhere in the city.
From Oakland Airport, passengers take a 10-15 min “AirBart” bus ride to the BART station; the cost is $3 for adults ($1 for seniors/children) exact change only; the bus runs every 10 minutes during the day. BART trains from there run directly to San Francisco and cost about $4.00.
The San Jose airport is served by a free shuttle to both VTA Light Rail and Caltrain  called the Airport Flyer — VTA Route #10 . Passengers arriving in San Jose can use Caltrain to reach San Francisco directly (this costs $7.50 one-way). Caltrain also links with the BART system at the Millbrae intermodal station. Be aware that public transportation within the South Bay is not as developed as around San Francisco. Also, when riding Caltrain, be sure to buy your ticket at the automated station kiosks before boarding, as they are not sold on the trains.
Private Airport Transportation
Taxis are considerably more expensive than the public transportation options. A taxi from SFO to the city can easily cost more than $40, and over $60 from OAK. Taxi and van prices from San Jose to San Francisco are significantly higher. Shared vans will cost around $14. If you plan to drive from a car rental area near the SFO airport to downtown San Francisco, you can take the 101 freeway. When returning a rental car to SFO, remember to take the rental car exit, otherwise you will have to wind your way slowly back to the rental car center.
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