Volcano Eruption Closes Jakarta Airport and Strands 150,000 Travellers

Volcanic ash from Mount Anak Krakatau has forced Indonesian aviation authorities to close eight airports in western Java and southern Sumatra, including Jakarta's Soekarno-Hatta International Airport, the busiest passenger and air cargo gateway in the country. As of September 6, 2026, the Transport Ministry counted 467 affected flights and around 150,000 affected passengers, and all eight airports were ordered to remain closed until 00:00 on September 7.

The volcano sits in the Sunda Strait between Java and Sumatra, roughly 150 kilometres from Soekarno-Hatta. The Center for Volcanology and Geological Hazard Mitigation recorded an eruptive episode that started at 23:07 on September 4, 2026 and ended at 00:04 on September 6. Two further eruptions followed on September 6, including a thirty-second event at 03:53 that produced visible lava flares on closed-circuit camera footage. The first eruption generated a lava fountain and detonations reported up to 700 kilometres away.

Air traffic control acted once ash was detected in the airspace around the capital. Soekarno-Hatta suspended operations from 01:30 on September 6 and then went through a series of extensions rather than a single closure window. An initial reopening target of 05:30 was pushed back to 09:30 after a paper test returned positive for ash particles around the airport. A further notice moved the estimated reopening to 13:30, and a replacement notice then set a closure window running from 13:23 to 17:30. Halim Perdanakusuma in Jakarta and Radin Inten II near Bandar Lampung were placed under the same rolling extensions, with estimated reopening times around 14:00.

The list of closed airports grew during the day. Six sites were shut by midday, namely Soekarno-Hatta, Halim Perdanakusuma, Radin Inten II, Husein Sastranegara in Bandung, and the smaller Budiarto and Pondok Cabe airfields in Banten. Taufik Kiemas and Atung Bungsu in South Sumatra were added later, bringing the total to eight. Shortly after 17:00, the meteorological agency reported that the ash was drifting east at five knots at 15,000 feet, after winds had earlier pushed it west towards the Indian Ocean. That wind reversal drove the decision to keep all eight airports closed until midnight.

Ash height differed sharply on either side of the volcano. Observations placed ash at about 20,000 feet on the Java side and up to 50,000 feet on the Sumatra side and over parts of Banten province. Ash at those altitudes sits inside the cruise levels used by long-haul traffic, which is why the disruption reached international routes and not only regional feeder services.

Cancelled and delayed services included international routes to Singapore, Kuala Lumpur, Hong Kong, Sydney, Seoul, Doha and Amsterdam, along with domestic connections to Lampung, Denpasar and Surabaya. Singapore Airlines cancelled its Jakarta services for the remainder of the day. Qantas confirmed that several of its own services were affected. The airport operator recorded 301 flights hit during one closure period alone, of which 58 were international.

The Transport Minister told airlines to inform passengers clearly about schedule changes, cancellations and diversions, and to honour passenger rights under Indonesian regulations. He also stated that no airport would be reopened while ash remained a safety concern and while paper tests continued to return positive results. Air navigation provider AirNav Indonesia is publishing updated notices to airmen as conditions change and has stepped up monitoring of ash dispersion to support traffic management decisions.

The eruption follows a long build-up rather than a sudden event. The Geological Agency raised the volcano to alert Level III on July 3, 2026 after monitoring showed rising volcanic earthquake counts, ground deformation and magma accumulating at shallow depth. An exclusion zone of five kilometres around the active crater was imposed at that time. Observers logged nineteen separate eruptions between June 2 and July 11, 2026, which means aviation authorities had already been tracking the volcano for two months before the current closures.

No casualties have been reported and no evacuation order has been issued. The nearest settlement lies more than sixteen kilometres from the crater. The national disaster agency has said there is no imminent tsunami risk, a point that matters because a partial crater collapse during the December 2018 eruption triggered a tsunami that killed more than 400 people along the coasts of Java and Sumatra. Authorities plan cloud seeding operations to trigger rainfall that would wash ash out of the atmosphere and off surfaces on the ground.

Ground level effects have spread across Lampung province in southern Sumatra and Banten province in Java. Schools cancelled activities, residents reported eye irritation from airborne ash, and fishermen suspended trips. Ash also reached parts of Jakarta itself.

For freight, the exposure runs through Soekarno-Hatta, which handles the bulk of Indonesian air cargo including electronics, garments, perishables and time-critical spare parts. A closure of even a single day pushes belly cargo capacity out of the network, and recovery lags the physical clearing of ash because aircraft and crews end up out of position after cancellations. Gates and stands stay occupied by delayed services, so backlogs typically persist for two to three days after airports reopen.

Several evolutions are plausible from here. The most likely path is a staged reopening once ash tests come back clear, followed by a rebooking backlog and residual cancellations through the following week. A second path involves further closures further east if the ash continues drifting in that direction, which would put Surabaya and Bali under pressure and affect a much larger share of international arrivals and cargo volume. A third path involves renewed eruptions at similar or greater intensity, since the volcano has remained at alert Level III since early July and the eruptive sequence is fluctuating rather than declining. In that case, airlines would probably move to preemptive cancellations and fuel-heavy reroutes around the Sunda Strait corridor rather than day-by-day suspensions.

Passengers and freight forwarders should confirm status directly with carriers, because a published reopening time is an estimate and has already been revised several times during this event.