On February 10, 1988, the
Federal Communications Commission (FCC) issued a construction permit for television station KBEH. However, channel 51 did not begin its broadcasting operation until August 8, 1999, transmitting programs from the
ValueVision network, which became ShopNBC in 2001 after
NBC (now part of
Comcast) acquired a 37% ownership stake in that network. In December 2000, the station changed its call letters to KWOG. Previously owned by African-American Broadcasting of Bellevue, KWOG was sold to
Fisher Communications on September 29, 2006. On October 31, 2006, the station changed its call letters one more time, this time to the current KUNS-TV. On January 1, 2007, it rang in the year by going from broadcasting home shopping programs to broadcasting
Hispanic programming as a
Univision affiliate almost instantly, providing viewers with programs such as
Sabado Gigante,
Despierta América and
El Gordo y La Flaca, in addition to an assortment of
telenovelas, along with many other programs. The station also started its own local newscast,
Noticias Noroeste with Jaime Méndez and Roxy de la Torre. The newscast originated from a studio at KOMO Plaza (formerly Fisher Plaza) in Seattle. On August 21, 2012, Fisher Communications signed an affiliation agreement with
MundoFox, a Spanish-language competitor to Univision that is owned as a
joint venture between
Fox International Channels and
Colombian broadcaster
RCN TV, for KUNS and Portland sister station
KUNP to be carried on both stations as digital subchannels starting in late September. On April 11, 2013, Fisher announced that it would sell its properties, including KUNS-TV, to the
Sinclair Broadcast Group. The deal was completed on August 8, 2013. On May 8, 2017, Sinclair Broadcast Group entered into an agreement to acquire
Tribune Media—owner of Fox affiliate
KCPQ (channel 13) and
MyNetworkTV affiliate
KZJO (channel 22)—for $3.9 billion, plus the assumption of $2.7 billion in debt held by Tribune, pending regulatory approval by the FCC and the
U.S. Department of Justice's Antitrust Division; the merger would have required divestitures in the Seattle market, as broadcasters are not currently allowed to legally own more than two full-power television stations in a single market. On April 24, 2018, Sinclair disclosed that it would buy KZJO and sell KUNS-TV to
Howard Stirk Holdings, while continuing to provide services to the station; KCPQ would concurrently be sold to
Fox Television Stations, which would make KCPQ a Fox
owned-and-operated station. Three weeks after the FCC's July 18 vote to have the deal reviewed by an
administrative law judge amid "serious concerns" about Sinclair's forthrightness in its applications to sell certain conflict properties, on August 9, 2018, Tribune announced it would terminate the Sinclair deal, intending to seek other
M&A opportunities. Tribune also filed a
breach of contract lawsuit in the
Delaware Chancery Court, alleging that Sinclair engaged in protracted negotiations with the FCC and the
U.S. Department of Justice's Antitrust Division over regulatory issues, refused to sell stations in markets where it already had properties, and proposed divestitures to parties with ties to Sinclair executive chair David D. Smith that were rejected or highly subject to rejection to maintain control over stations it was required to sell. The termination of the Sinclair sale agreement places uncertainty for the future of Fox's purchases of KCPQ and the other six Tribune stations included in that deal, which were predicated on the closure of the Sinclair–Tribune merger. On October 11, 2023, it was reported that KUNS-TV would become the Seattle market's new affiliate of
The CW effective January 1, 2024, replacing KOMO-DT2, which reverted to a full-time affiliation with the Sinclair-owned diginet
Comet. The move was controversial within the local Hispanic community as it implied the discontinuation of the only local Spanish-language newscast in Western Washington; Sinclair did not confirm the discontinuation of Spanish-language content in general on KUNS until nearly a month later, having offered Univision a
subchannel position that the network declined. KUNS aired its last such newscast on December 31, with
Bellingham-based
KVOS-TV (channel 12) assuming the Univision affiliation the following day; former co-anchor Jaime Méndez started streaming his own newscast from his
Lynnwood home on January 5, 2024, in response to the move. When it switched to The CW, rather than any associated CW branding, Sinclair instead rebranded KUNS-TV as "arc Seattle", with "ARC" standing for "authentic, relatable, community". Alongside the rebranding, the station also launched a lifestyle-oriented morning news program also titled
arc Seattle. In March 2025, the
Seattle Storm of the
WNBA announced an agreement to air 33 regional games on KUNS in the
2025 season; select games will also be simulcast by KOMO. ==Technical information==