About 18... assuming you were talking about "miles".
san Diego
They are numerous but San Diego International is SFO.
San Diego international airport IATA code SAN is the nearest airport.
From downtown San Diego you cannot see Tijuana; however from some of its suburbs such as San Ysidro and Otay Mesa, you can see the northern areas of the city.
Border each other
San Diego CA. a map of California will help you find out
To travel to Tijuana from San Diego, you can drive across the border at the San Ysidro Port of Entry, take a bus, or use the Tijuana Trolley. Make sure to have your passport or other approved identification for crossing the border.
Some top attractions to visit on a San Diego to Tijuana tour include the Tijuana Cultural Center, Avenida Revolucin for shopping and dining, and the Tijuana Wax Museum. Additionally, the Tijuana Brewery and the Tijuana Arch are popular spots to visit.
The best way to travel from San Diego to Tijuana is by car or by taking the Cross Border Xpress (CBX) pedestrian bridge.
San Diego International Airport was created in 1928.
Tijuana
It's a 5 mile drive from the San Diego Zoo to the San Diego airport.