Anak Krakatau Eruption Forces Closure of Jakarta's Main Airport, Grounding Over 300 Flights

At 3:53 a.m. local time on Sunday, September 6, 2026, Mount Anak Krakatau erupted for 30 seconds, sending a 15,000-meter ash plume over the Sunda Strait and forcing the immediate closure of Indonesia's primary aviation hub. The suspension at Jakarta's Soekarno-Hatta International Airport grounded 301 flights over a 12-hour window, severing the capital's main domestic and international air links as volcanic material drifted across western Java and southern Sumatra.[1]

The disruption cascaded rapidly through the regional aviation network. AirNav Indonesia halted operations at Soekarno-Hatta and Halim Perdanakusuma airports in Jakarta, alongside four regional facilities including Radin Inten II Airport in Lampung. By mid-afternoon, the Directorate General of Civil Aviation recorded 516 affected flight movements nationwide, leaving an estimated 22,800 passengers stranded in Jakarta alone as carriers scrambled to reposition aircraft parked on exposed aprons.[3]

International carriers absorbed a significant share of the cancellations. Singapore Airlines grounded 19 flights between Changi Airport and Jakarta on Sunday, advising passengers that schedules would remain fluid as airspace assessments continued. Operations to Doha, Sydney, Hong Kong, and Kuala Lumpur were similarly halted, with inbound widebody aircraft diverted to unaffected regional hubs or forced to return to their origins.[1][2][4]

The closures followed a physical tarmac inspection conducted at Soekarno-Hatta between 12:35 a.m. and 1:05 a.m., which confirmed the presence of abrasive volcanic ash descending on the facility. Ash poses a severe mechanical threat to commercial aviation, capable of melting inside jet engines to form glassy deposits that restrict airflow and trigger catastrophic turbine failure.[4]

Anak Krakatau, situated in the strait separating Java and Sumatra, had exhibited elevated seismic activity since Friday before the Sunday morning eruption. Indonesia's volcanology agency and the Darwin Volcanic Ash Advisory Centre tracked two distinct ash clouds via satellite imagery. The lower plume drifted northeast toward Jakarta at 6,000 meters, while a secondary cloud reached 15,000 meters and moved westward over the Indian Ocean.[4]

Despite the severe disruption to transport infrastructure, the eruption has not triggered mass evacuations. The nearest civilian settlement is located 16 kilometers from the volcano, well outside the three-kilometer exclusion zone maintained by the Center for Volcanology and Geological Hazard Mitigation. The disaster mitigation agency confirmed Saturday that the current eruptive phase presents no imminent tsunami risk, a critical metric given the volcano's history.[4]

Foreign missions in Jakarta quickly issued travel directives as the ash footprint expanded. The U.S. Embassy in Indonesia released a natural disaster alert Sunday morning, instructing citizens to secure independent evacuation plans and monitor the Indonesian Disaster Management Agency for localized guidance. Similar advisories from regional neighbors emphasized the unpredictability of the ash dispersion models.[5]

"Safety remains the top priority in every operational decision, including flight schedule adjustments made by airlines," said Lukman F. Laisa, the Ministry of Transportation's director general of civil aviation. While Soekarno-Hatta began limited operations after 1:30 p.m., Laisa warned that the network faces days of cascading delays. Airlines must now navigate crew timeouts, out-of-position fleets, and constrained terminal capacity to clear the backlog of thousands of displaced travelers.[1][4]