San Diego International Airport (IATA: SAN), also known as Lindbergh Field, is an international airport 3 mi (4.8 km) northwest of downtown San Diego, California. It is operated by the San Diego County Regional Airport Authority.
San Diego International is the busiest single-runway commercial airport in the United States. It is also the second-busiest single-use runway in the world after Gatwick Airport with about 465 scheduled operations carrying 48,000 passengers each day; a total of 18,756,997 passengers in 2014. San Diego is the largest metropolitan area in the United States that is not an airline hub or secondary hub; however, San Diego is a focus city for Southwest Airlines.
The top five carriers in San Diego, by seat capacity, are Southwest Airlines (42.7%), American Airlines including merger partner US Airways (14.0%), United Airlines (11.2%), Alaska Airlines (10.1%), and Delta Air Lines (9.9%).
The airport has domestic flights, as well as international flights to Canada, the United Kingdom, Mexico, and Japan. Wikipedia