For detailed information on getting in to San Diego, see the Get in section of San Diego.
By plane
There are two commercial airports in San Diego County: San Diego International Airport IATA: SAN is by far the major one, served by many airlines offering flights from cities around the country and some international flights to Mexico and Canada. McClellan-Palomar Airport IATA: CLD in Carlsbad serves a couple of commuter airlines providing service from Los Angeles and Phoenix.
By train
Amtrak's frequent Pacific Surfliner (http://www.amtrak.com/ser...) San Luis Obisbo-Los Angeles-San Diego route serves San Diego County with four stops: one in Oceanside, one in Solana Beach, one at the southern end of the line at Union Station in Downtown San Diego, and a secondary station in Old Town San Diego which is served on weekends.
By car
Three major interstate roadways, I-5, I-8, and I-15, lead into San Diego County. I-5 runs from the north along the coast, I-8 comes in from the east through the desert, and I-15 leads in to San Diego from the northeast.