LA/Ontario International Airport (IATA: ONT), formerly and still commonly known as Ontario International Airport, is a public airport two miles east of downtown Ontario, a city in San Bernardino County, California, US, and about 38 miles east of Downtown Los Angeles. It is owned and operated by the Los Angeles World Airports (LAWA), an agency of the city of Los Angeles. In 2008, 6.2 million passengers used the airport, 13.5% less than 2007. Passenger volume in April 2011 was down 4.6%, compared to the previous year.
In early 2011 Southwest Airlines carried 54% of the passengers. Wikipedia