|Broadcast area||Inland Empire/Orange County, California|
|Branding||Vien Thao Radio|
|First air date||1946(as KNSE)|
|Power||10,000 watts (day)
1,000 watts (night)
|Callsign meaning||K The SPA (Former Format)|
|Former callsigns||KNSE (1946-1998)
|Owner||Astor Broadcast Group|
KSPA is a commercial radio station located in Ontario, California, broadcasting to the Inland Empire area on 1510 AM. KSPA airs an Ethnic format. KSPA was the flagship station of the Rancho Cucamonga Quakes of the California League of Minor League Baseball from 2008 to 2013. It is also an affiliate of the San Diego Chargers and USC Trojans football. Until 2008, KSPA was a local affiliate of the Los Angeles Angels of Anaheim.
From March 15, 2010 until November 25, 2010, KSPA aired a talk radio format. From 2002 until March 2010, KSPA aired an adult standards format, known as The SPA, which from February 1, 2007 until March 15, 2010, was simulcast on sister station KFSD, expanding KSPA's signal into San Diego County. The station aired music programs on the weekends, including Big Band Jump with Don Kennedy, Jazz at The SPA with Jeff Gehringer, Sounds of Sinatra with Sid Marks, and Radio Deluxe with John Pizzarelli.
Prior to 2002, KSPA was classic country station KIKA (the call letters played off KIKF, which was a sister contemporary country station at the time). Before that, it was KMSL, which as of 2008[update] was the only all-sports station ever to broadcast in the Inland Empire market. The morning show was co-hosted by minor league baseball public address announcer David Achord and former National Football League running back Greg Bell. The station was owned by the Rancho Cucamonga Quakes baseball team and its call sign was derived from "muscle," a term associated with the stereotypical strength of athletes. KMSL aired Quakes games as part of its programming, as it does now.
Before that, it was the leading Spanish-language radio station in the area, KNSE (pronounced "KEEN-SAY" – quince is the Spanish word for the number fifteen).
In November 2010, program director Jeff Gehringer announced that the talk format failed to find an audience and would be dropped. On November 26, 2010, the day after Thanksgiving, KSPA began playing Christmas music, which was also airing on KFSD thus reviving the simulcast. On December 26, both stations returned to their previous adult standards format. That format lasted until March 1, 2012, when it flipped to a business talk format (also simulcast with KFSD) that it inherited from sister station KCEO. KSPA is rumored to be planning a switch to Cumulus Media's syndicated Nash FM country music format in early 2015. In February 2015 KSPA changed their format to country, branded as "KIK Country 1510".
On May 18, 2015 KSPA changed its format to Spanish Catholic religious, branded as "Guadalupe Radio".  On January 1, 2017, KSPA returned to an adult standards format. As of March 2017 KSPA Dropped Adult Standards and is airing an Ethnic (Vietnamese) format.
- Application for Construction Permit for Commercial Broadcast Station - Federal Communications Commission
- "Rancho Cucamonga, Calif., Sports Radio Station Lands Lakers Broadcast". Tribune Business News. August 9, 1998.
- Country Comes to AM in Orange and San Diego Counties
- Guadalupe Radio Expands in Southern California
- FCC History Cards for KSPA
- Query the FCC's AM station database for KSPA
- Radio-Locator Information on KSPA
- Query Nielsen Audio's AM station database for KSPA