LE SSERAFIM Added to 2026 iHeartRadio Music Festival Lineup Alongside BTS

LE SSERAFIM has been added to the performer lineup for the 2026 iHeartRadio Music Festival, putting another major K-pop name on one of the United States’ most visible multi-genre music stages.

According to the June 30 announcement reported by Soompi, iHeartMedia newly confirmed LE SSERAFIM for the two-day festival, which is scheduled for September 18 and 19 at T-Mobile Arena in Las Vegas. BTS had already been announced as a headliner for the event, giving the festival a notable Korean music presence across both nights.

The schedule separates the two acts across the weekend. BTS is set to perform on September 18, the first day of the festival, while LE SSERAFIM is scheduled for September 19, the second day. That placement gives the event back-to-back K-pop representation without positioning the groups as a single combined segment.

K-pop’s Festival Footprint Expands

For LE SSERAFIM, the booking adds another U.S. festival appearance to a career built around high-energy performance, sharp choreography, and a growing international audience. The group has increasingly operated as a global pop act rather than a release-focused K-pop name limited to Korean music shows and fan events.

The iHeartRadio Music Festival is also a different kind of platform from a K-pop concert or fan convention. Its lineup usually mixes pop, hip-hop, rock, country, dance, and legacy acts, bringing artists before audiences that may not be centered on one fandom. In that setting, LE SSERAFIM’s appearance can function as both a fan moment and a wider introduction.

BTS’s role remains the highest-profile Korean component of the bill. The group’s September 18 headlining slot continues a year in which its live and chart activity has kept the act at the center of global K-pop coverage. Having LE SSERAFIM added one night later broadens the Korean presence beyond a single superstar booking.

A Mixed-Genre Lineup in Las Vegas

The broader 2026 lineup underlines the scale of the event. Other announced performers include Benson Boone, Cardi B, Goo Goo Dolls, Kenny Chesney, Lainey Wilson, Major Lazer, Muse, Snoop Dogg, Weezer, and Zara Larsson. That range makes the festival a mainstream pop-culture gathering rather than a genre-specific showcase.

For K-pop acts, that kind of bill matters because it places Korean performers in direct conversation with established Western festival names. The symbolism is not only about appearing in the United States, but about being programmed as part of the same commercial pop ecosystem. The distinction has become increasingly important as K-pop groups compete for attention across streaming, radio, touring, and short-form video platforms.

LE SSERAFIM’s addition also reflects the way U.S. promoters now use K-pop bookings to energize festival weekends. Dedicated fandoms can drive online conversation before tickets are scanned, while the arena setting gives artists a chance to convert casual listeners who came for a broader lineup.

The Las Vegas location adds another layer. T-Mobile Arena has become a familiar destination for major global music events, award shows, and high-capacity concerts. A two-day festival there gives both BTS and LE SSERAFIM a stage designed for television-friendly production, large-scale audience shots, and quick transitions between performers.

What Fans Should Watch Next

The announcement confirms the dates and basic placement, but fans will still be watching for practical details such as set times, ticketing updates, broadcast information, and whether either K-pop act prepares a festival-specific stage. Those details often shape the final impact of a high-profile booking.

For now, the key development is clear: the 2026 iHeartRadio Music Festival will feature Korean pop on both nights. With BTS anchoring the first day and LE SSERAFIM joining the second, the Las Vegas event is positioned to show how deeply K-pop has moved into the mainstream festival circuit.