LE SSERAFIM iHeartRadio Festival Appearance Set for September 19 in Las Vegas

LE SSERAFIM has been added to the 2026 iHeartRadio Music Festival presented by Capital One, placing the group on one of the event’s major U.S. festival lineups. The LE SSERAFIM iHeartRadio appearance is scheduled for September 19 at T-Mobile Arena in Las Vegas, during the two-day festival running September 18 and 19, 2026. ^{1 2}

The lineup update was announced after iHeartRadio disclosed additional performers on June 30, local time. iHeartMedia’s announcement stated that “LE SSERAFIM is joining the lineup,” confirming the group’s participation alongside major acts already named for the festival. ^{1 3}

LE SSERAFIM iHeartRadio Festival Schedule

The 2026 iHeartRadio Music Festival is set for September 18 and 19 at T-Mobile Arena in Las Vegas. Yonhap reported that BTS is scheduled to perform on September 18, while LE SSERAFIM is scheduled for September 19. ²

Multiple reports identify the appearance as a first for a K-pop girl group at the iHeartRadio Music Festival. Newsis and Star Today both described LE SSERAFIM as the first K-pop girl group to take the festival stage, framing the booking as a notable addition to the event’s Korean-pop representation. ^{4 3}

The festival’s broader lineup includes BTS, Cardi B, Snoop Dogg, Muse, Weezer and other artists, with LE SSERAFIM listed among the performers in the expanded announcement. ¹ American Top 40 also reported the lineup expansion on June 30, identifying LE SSERAFIM as part of the 2026 festival bill. ⁵

Broadcast and Streaming Details

The festival will be available beyond the Las Vegas venue through livestreaming and radio distribution. iHeartMedia named Disney+ and Hulu as livestream destinations for the 2026 iHeartRadio Music Festival. ¹ Newsis reported that the performances will also be carried through more than 150 iHeartMedia radio stations, while American Top 40 described the event as airing across more than 150 iHeartMedia radio markets. ^{4 5}

That distribution gives the LE SSERAFIM iHeartRadio performance a U.S. broadcast context as well as an in-person festival setting. The available source material does not provide a detailed stage time, setlist, or song selection for the group’s September 19 appearance.

Ryan Seacrest is listed in Korean coverage as the host for the 2026 event, and the same reports place LE SSERAFIM in a lineup with BTS, Cardi B and Snoop Dogg. ⁶ The core schedule details, however, are anchored by the two-day festival dates, the Las Vegas venue, and LE SSERAFIM’s September 19 performance date.

Lineup Context and Related U.S. Schedule

LE SSERAFIM’s addition was reported in Korean media as part of a broader run of U.S.-focused activity. Star Today noted that the group’s September schedule also includes BlizzCon 2026 and North American tour dates, while identifying the iHeartRadio Music Festival booking as part of the same period. ³

The source material does not list all of LE SSERAFIM’s related September tour dates or provide further details about the BlizzCon appearance. It also does not specify whether the iHeartRadio Music Festival performance will be connected to a particular release or promotional campaign.

For the festival itself, the most consistently reported details are the expanded lineup announcement, the September 18-19 schedule, the Las Vegas venue, and the group’s September 19 slot. Reports from iHeartMedia, Yonhap, Newsis, Star Today and American Top 40 align on LE SSERAFIM’s inclusion in the 2026 iHeartRadio Music Festival lineup. ^{1 2 4 3 5}

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