San Francisco is very accessible especially with nonstop flights from East Coast states like New York. Another means of transport to the city is through flights that have midway stops but would require a much longer travel time. These flights can land on three airports in the city: San Francisco International Airport, Oakland International Airport and San Jose International Airport.
From the airport, there are a few means of transport to downtown. You can take a taxi, airport shuttle service, bus or through the BART. The BART heads directly to downtown in about 30 minutes and is more economical too.