Aviation officials closed airspace over Soekarno-Hatta and Halim Perdanakusuma airports in Jakarta along with Radin Inten II in Lampung and two additional facilities after detecting volcanic ash from the eruption. The move disrupted 516 flight movements including 202 at the capital’s main airport that impacted roughly 22,800 passengers according to figures from the Directorate General of Civil Aviation. Airport operators extended the closure at Soekarno-Hatta until mid-afternoon while crews performed repeated checks on ash density and coordinated with carriers to rebook travelers.[[1]](https://apnews.com/article/indonesia-volcano-eruption-airport-flights-cancel-12c3cb67859b2c51054b378d60148d33)
Indonesia’s Geological Agency reported that the volcano situated in the Sunda Strait between Java and Sumatra displayed heightened seismic activity since Friday before producing a 30-second eruption at 3:53 a.m. local time on Sunday. Camera footage released by the agency captured lava flares shooting from the crater during the burst. The meteorological agency BMKG measured ash plumes reaching 6,000 meters on the Java flank and 15,000 meters on the Sumatra side with some material drifting into Banten province.[[2]](https://www.aljazeera.com/news/2026/9/6/indonesias-main-airport-suspends-flights-due-to-anak-krakatoa-eruption)
Several schools in nearby districts canceled outdoor programs on Saturday after students and residents reported eye and skin irritation from the falling ash a local media survey found. Fishermen along affected coastlines postponed their outings as a precaution against poor visibility and potential hazards. The national disaster mitigation agency stated that monitoring showed no immediate tsunami risk associated with the current eruptive phase.[[3]](https://www.cnn.com/2026/09/06/asia/indonesia-anak-krakatau-eruption-intl-hnk)
Director General of Civil Aviation Lukman F. Laisa emphasized that safety dictated every decision while his office worked alongside airlines airport operators and meteorology experts to track developments. «Safety remains the top priority in every operational decision, including flight schedule adjustments made by airlines,» Laisa said. Singapore Airlines canceled at least 19 services to and from Jakarta while other international carriers rerouted flights bound for Singapore Hong Kong Sydney and Kuala Lumpur.[[4]](https://www.straitstimes.com/asia/se-asia/indonesias-jakarta-airport-suspends-flights-due-to-ash-from-mount-anak-krakatau)
Anak Krakatau formed inside the submerged caldera left by the catastrophic 1883 Krakatoa explosion that killed more than 36,000 people and temporarily cooled global temperatures according to geological records. The island generated a deadly tsunami in December 2018 after a flank collapse claimed more than 400 lives along Java and Sumatra shores Indonesian authorities documented. The volcanology center keeps the site under continuous observation given its position within one of the planet’s most seismically volatile zones.
Indonesia straddles the Pacific Ring of Fire and contains 127 active volcanoes the largest concentration worldwide a Geological Agency compilation shows. This frequency has compelled the aviation sector to maintain specialized ash-avoidance protocols that routinely alter flight paths across the archipelago. Officials indicated the current restrictions would remain in place until satellite data and ground tests confirm that ash concentrations have fallen below operational thresholds.
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