Anak Krakatau Eruption Forces Suspension of All Flights at Jakarta's Soekarno-Hatta International Airport

Anak Krakatau, a volcano in the Sunda Strait between Java and Sumatra, erupted for 30 seconds at 3:53 a.m. Sunday, prompting Indonesian authorities to suspend all flight operations at Jakarta's Soekarno-Hatta International Airport from 5:30 a.m. as volcanic ash drifted across western Indonesia. Indonesia's Geological Agency said the volcano had shown signs of activity since Friday before the eruption, and closed-circuit camera footage showed lava flares at the mountain. No casualties were reported and no evacuation order was issued; the nearest settlement is more than 10 miles from the volcano, though authorities warned residents and visitors to stay at least two miles from the active crater.

The closure affected 209 flight movements and approximately 22,800 passengers. A total of 170 aircraft that had been parked overnight remained on airport aprons. The busiest disrupted domestic route was to Makassar in South Sulawesi, while Singapore recorded the highest number of disrupted international flights; other affected international destinations included Hong Kong, Sydney, Amsterdam, Seoul, Doha, and Kuala Lumpur. Domestic flights to Lampung, Bali, and Surabaya were also canceled or diverted.

Indonesia's Center for Volcanology and Geological Hazard Mitigation reported that volcanic ash spread across parts of Jakarta and Lampung province. Satellite imagery analyzed by Indonesia's volcanology agency and the Darwin Volcanic Ash Advisory Center in Australia identified two ash clouds: one rose to 20,000 feet and drifted northeast, affecting Jakarta, Banten, West Java, and surrounding waters, while a second reached 50,000 feet and moved west and northwest, covering parts of Banten, Lampung, and Bengkulu provinces, the southern Sunda Strait, and sections of the Indian Ocean. Lukman F. Laisa, the Ministry of Transportation's director general of civil aviation, warned that flight schedules could face cascading disruptions affecting aircraft rotations, fleet availability, and terminal capacity as airlines work to restore operations, and authorities urged travelers to check with airlines for the latest flight information.

Anak Krakatau, meaning "child of Krakatau," is the offspring of the Krakatau volcano whose 1883 eruption triggered a period of global cooling. A 2018 eruption caused a tsunami that killed at least 430 people across Sumatra and Java. The volcano has been rated at alert level 3 on a scale of 4, and scientists note that Anak Krakatau island is now only about a quarter of its original size.

Ash-driven airspace closures are a recurring operational hazard for airports downwind of active volcanoes, and this case shows how quickly the effect compounds: a single 30-second eruption grounded 170 parked aircraft and disrupted 209 flight movements at once, rather than degrading service gradually. Because ash cloud altitude and drift direction determine which routes are hit, Soekarno-Hatta's exposure ran from short domestic legs like Makassar to long-haul international connections through Singapore, Hong Kong, Sydney, Amsterdam, Seoul, Doha, and Kuala Lumpur simultaneously.

Airport-wide closures of this kind stress the parts of an operation that are hardest to recover quickly — aircraft rotations, crew and fleet availability, and terminal apron capacity — which is precisely what Indonesia's civil aviation director general flagged as the risk once the ash clears. Restoring a full schedule after 170 aircraft sit idle overnight typically takes longer than the closure itself, since aircraft and crews have to be repositioned before normal rotations resume.

The next indicators to watch are the volcanology agencies' updated ash-cloud advisories and any change to the alert level, currently rated 3 of 4, which will determine whether the suspension is lifted in stages or held in place.