On September 6, 2026, the Anak Krakatau volcano erupted in the Sunda Strait, triggering widespread aviation chaos across Indonesia. The event led to the closure of Jakarta's Soekarno-Hatta International Airport and affected approximately 150,000 travelers.
150,000 passengers stranded by the Soekarno-Hatta closure
The closure of Jakarta's Soekarno-Hatta International Airport until 11:59 p.m. local time on Sunday resulted in the cancellation of 467 flights, according to the report. The disruption extended beyond the capital, as AirNav Indonesia shut down airspace around Halim Perdanakusuma airport and six other facilities, including Radin Inten II in Lampung. Even distant hubs like Medan and Bali’s I Gusti Ngurah Rai International Airport experienced service interruptions as volcanic ash drifted across western Indonesia.
Lukman F. Laisa, the director general of civil aviation at the Transportation Ministry, emphasized that safety was the primary driver for these operational decisions. However, Laisa warned that the sudden halt would create cascading disruptions for airlines, specifically impacting fleet availability, aircraft rotations, and terminal capacity as they attempt to clear the backlog of stranded passengers.
Two ash plumes reaching 15,200 metres
Satellite imagery from Indonesia’s volcanology agency and the Darwin Volcanic Ash Advisory Centre identified two distinct ash clouds resulting from the eruption. One plume reached an altitude of 6,100 metres and drifted northeast over Banten, West Java, and Jakarta. A second, more massive cloud ascended to 15,200 metres, spreading over the southern Sunda Strait, the Indian Ocean west of Sumatra, and the provinces of Bengkulu and Lampung.
The Geological Agency reported that the activity occurred in two bursts on Sunday morning: a 30-second eruption at 3:53 a.m. local time,followed by a shorter 16-second burst roughly three hours later... While no casualties were reported, authorities maintained a strict three-kilometre exclusion zone around the active crater to protect visitors and residents.
The shadow of the 2018 tsunami and 1883 cooling
The current volatility of Anak Krakatau—which translates to "child of Krakatau"—echoes a history of catastrophic geological events. As the report says, the original Krakatau volcano produced a monumental eruption in 1883 that was powerful enough to trigger a period of global cooling. This legacy of instability continues with the offspring volcano,which caused a deadly tsunami in 2018 that killed at least 430 people across Java and Sumatra.
That 2018 disaster was caused by an underwater landslide that collapsed a large portion of the volcano's southwest slope . Scientists noted that the island was reduced to roughly a quarter of its original size following that collapse, illustrating the fragile and transformative nature of the Sunda Strait's volcanic activity.
Lana Saria's warning on unpredictable magma supplies
Lana Saria, head of Indonesia’s Geological Agency, noted that volcanic activity at Anak Krakatau has been intensifying since July, with Sunday's event marking the strongest eruption in that window . saria stated that the repeated bursts indicate a steady supply of magma and volcanic gases beneath the surface, though the agency cannot currently predict if a larger, more destructive eruption is imminent.
Several critical questions remain regarding the long-term risk to the region. While the Geological Agency is monitoring data, it remains unclear if the current magma supply will stabilize or lead to another slope collapse similar to the 2018 event. Furthermore, the report only provides the perspective of Indonesian government officials and a few stranded travelers; it does not include commentary from the airlines themselves regarding the specific financial or logistical costs of the 467 cancelled flights.
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