Volcanic Eruptions Reshape Jakarta's Events Calendar in September 2026
A sustained eruption from Mount Anak Krakatau, the volcanic island rising from the Sunda Strait between Java and Sumatra, has sent ripple effects far beyond its immediate geography, cancelling international concerts, shutting airports across western Indonesia, and leaving hundreds of thousands of travelers stranded.
The volcano began erupting on September 5, pushing ash plumes as high as 15,000 metres and triggering the closure of eight airports. Jakarta's Soekarno-Hatta International Airport, one of Southeast Asia's busiest, halted operations for several days before reopening on September 9 after wind shifted the ash away. Indonesia's geology agency has kept Anak Krakatau at Level III, or "Alert," on its four-tier scale, indicating the risk of further eruptions remains elevated.
Concurrent Activity at Four Other Volcanoes
Anak Krakatau was not erupting in isolation. Around the same period, four other Indonesian volcanoes recorded activity: Mount Ibu in North Maluku, Mount Semeru in East Java, Mount Ili Lewotolok in East Nusa Tenggara, and Mount Sinabung in North Sumatra. The combined disruption affected upwards of 340,000 travelers in total, with more than 2,900 flights delayed, cancelled, or diverted, according to figures cited by Indonesia's Chief Infrastructure Minister Agus Harimurti Yudhoyono.
K-Pop Concerts Among the Casualties
The travel chaos has reached Jakarta's entertainment scene. South Korean girl group Mamamoo cancelled the Jakarta stop of its "4WARD" world tour, which had been scheduled for September 19 at NICE PIK 2. The group's agency, RBW, announced the decision the previous Friday, citing "unpredictable conditions" from the volcanic activity and strengthened local safety measures, and noting the decision followed consultations with the local promoter. Safety of artists and audience members was given as the primary reason.
Former Big Bang member T.O.P separately announced the cancellation of his "Pre-Studio" tour stop in Jakarta, also scheduled for September 19. Malay Mail, which first reported these cancellations, noted both acts were responding to the same underlying safety environment.
What Travelers Should Know Right Now
Soekarno-Hatta has resumed operations, but the geology agency's Level III status means conditions can change quickly. Travelers with upcoming flights into or out of western Indonesian airports should monitor airline communications closely and check the latest advisories from Indonesia's Center for Volcanology and Geological Hazard Mitigation (PVMBG) before travel. Flexible booking terms are worth requesting at the time of reservation while the alert level remains elevated.
Why It Matters for Hosts
Independent accommodation operators in Jakarta and across western Java are likely seeing a wave of last-minute cancellations alongside stranded guests who cannot depart as planned. Both situations call for a clearly communicated, written force-majeure policy that guests can find before they book. Proactively reaching out to upcoming guests with current airport status and flexible rescheduling options builds trust and reduces disputes. It is also worth coordinating with local tour and event partners now: if large-scale events continue to cancel, marketing messaging may need to pivot toward domestic travelers and shorter-lead bookings until the volcanic situation stabilizes.
Details on the concert cancellations and flight disruptions were first reported by Malay Mail on September 14, 2026.
First reported by malaymail.com.