KWWN officially signed on in December 2007, and was running tests for several months on its transmitter. These tests were mainly to arrange the nighttime directional signal of the station, so it would not interfere with nearby KNZZ or other stations on 1100 kHz. While testing, the station ran at half power (10,000 watts day and 1,000 watts night) to further limit the possibility of interference. It currently is running at its normal power.
Originally, KWWN simulcast sister station KBAD. Sometime in 2008, the simulcast ended; KBAD became the local affiliate of Fox Sports Radio, while KWWN picked up the ESPN Radio affiliation. KENO, which had been the FSR station, joined ESPN Deportes Radio. KWWN currently has rights to the San Diego Chargers radio network.