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Indonesia’s Anak Krakatau volcano has triggered sweeping airport closures across Java and Sumatra, grounding hundreds of flights and stranding travellers as volcanic ash drifts through some of the country’s busiest air corridors.
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Airport closures widen across Java and Sumatra
Volcanic ash from Anak Krakatau began disrupting aviation late on 5 September 2026, when the volcano entered a phase of continuous eruption and ash clouds spread across western Indonesia. Public information from Indonesia’s meteorological agency BMKG indicates that ash dispersion reached key flight paths over Java and Sumatra, forcing authorities to restrict air traffic in affected zones.
By 6 September, operations at Soekarno Hatta International Airport serving Jakarta were repeatedly suspended as ash was detected in the airspace and on aerodrome test surfaces. Coverage from Indonesian and international media reports that the main hub, located more than 150 kilometres from Anak Krakatau, joined a growing list of airports temporarily closed as the ash cloud shifted with prevailing winds.
Notices to airmen (NOTAMs) and statements published by Indonesia’s Transport Ministry show that at least eight airports across Java and Sumatra have faced full or partial shutdowns since the weekend, including Jakarta’s Soekarno Hatta and Halim Perdanakusuma, as well as regional gateways such as Radin Inten II in Lampung and Husein Sastranegara in Bandung. In some cases, initial short-term closures have been extended as tests continued to find ash contamination.
According to figures released by Indonesian aviation authorities and summarised in local news agency reports, the cascading closures and restrictions have led to more than a thousand flight cancellations or delays and affected well over one hundred thousand passengers. The pattern of disruption remains fluid, with reopening times subject to change at short notice as ash concentrations fluctuate.
Current status of flights and likely disruption window
As of the morning of 7 September 2026, Anak Krakatau’s most intense eruptive phase appears to have eased compared with the previous 24 to 48 hours, based on monitoring summaries from Indonesia’s Geological Agency cited in international coverage. However, BMKG bulletins and aviation notices indicate that residual ash in the atmosphere continues to pose a risk for jet operations over parts of western Java and southern Sumatra.
Indonesia’s Transport Ministry has announced through its public channels that temporary closures at eight affected airports have been extended into 7 September, in some cases until at least 09:00 local time and in others until later in the day depending on updated ash tests and forecasts. Air navigation service provider updates suggest that some airports may reopen in stages, starting with limited operations on selected runways and routes once ash levels fall below risk thresholds.
Travel industry advisories compiled by foreign chambers of commerce and airlines emphasise that conditions can change quickly as wind patterns shift the ash plume. Even where airports reopen, backlogs of stranded passengers and repositioning of aircraft are expected to cause knock-on disruption for at least several days. Travellers booked to fly through Jakarta or regional hubs on Java and Sumatra should anticipate possible last-minute schedule changes, diversions to alternative airports, and extended waiting times.
At this stage there is no clear, definitive timeline for a full return to normal operations. The duration of disruption will depend on whether Anak Krakatau’s activity subsides steadily or whether further ash-emitting bursts occur, as well as on meteorological factors that influence how quickly ash disperses from critical air corridors.
Which destinations and routes are most affected
The heaviest disruption is concentrated on domestic and international routes that pass through Jakarta’s Soekarno Hatta, the country’s busiest airport and a major Southeast Asian hub. Publicly available flight statistics compiled by local and international media show that hundreds of departures and arrivals at Soekarno Hatta alone have been cancelled or delayed since the eruption intensified, affecting both full-service and low-cost carriers.
Secondary airports around the capital region, including Halim Perdanakusuma and Pondok Cabe, have also faced operational suspensions, constraining options for rerouting passengers within the Jakarta area. On Sumatra and western Java, airports such as Radin Inten II and Husein Sastranegara have reported ash contamination and temporary closures, disrupting domestic links to cities including Lampung and Bandung.
International services are particularly affected on routes connecting Jakarta with major regional hubs such as Singapore, Kuala Lumpur, Bangkok and Hong Kong, along with long-haul flights to the Middle East, Europe and Australia. Some airlines have opted to cancel outright, while others have been diverting services to unaffected airports, including alternative gateways in neighbouring countries, according to flight-tracking data cited in aviation forums and news coverage.
Popular Indonesian leisure destinations far from Anak Krakatau, including Bali, remain largely accessible by air, but some connecting itineraries via Jakarta have been interrupted. Travellers originating in or bound for Jakarta may find that alternative routings via other regional hubs are temporarily more reliable than those requiring a transit through the capital.
Practical guidance for travellers with upcoming plans
For travellers currently in Indonesia or due to fly in the coming days, the most important step is to verify flight status directly with airlines and, where possible, through airport websites or apps shortly before departure. Travel notices from business chambers and tourism information services stress that third-party booking platforms may not update schedule changes as rapidly as airlines’ own systems when disruption is driven by fast-moving operational assessments.
Passengers whose flights are cancelled or significantly delayed are being offered a mix of options depending on the airline, including rebooking on later services, rerouting via alternative airports, or in some cases refunds or vouchers in line with carrier policies. Travellers should check the specific conditions attached to their tickets and consider contacting their travel insurer to understand coverage for extra accommodation and transport costs arising from extended airport closures.
Those with non-essential trips scheduled in the immediate term may wish to explore deferring travel until conditions stabilise and backlogs ease. For journeys that must proceed, building in longer connection times, travelling with flexible itineraries, and remaining prepared for last-minute gate or routing changes can help reduce stress in an uncertain operating environment.
On the ground in affected cities, local transport and hospitality providers are reporting increased demand from stranded passengers seeking additional hotel nights and transfers to alternative airports. Securing accommodation early and confirming check-out times can be prudent for travellers who are unsure when their rescheduled flights will depart.
Safety, health and long-term outlook
Anak Krakatau sits in the Sunda Strait between Java and Sumatra and is part of the same volcanic system as the Krakatau volcano whose 1883 eruption had global climatic effects. While the current episode is on a far smaller scale, monitoring agencies and disaster management bodies in Indonesia have highlighted the importance of treating volcanic ash as a serious aviation and health hazard.
Volcanic ash can damage aircraft engines and critical systems, which is why even trace amounts detected in airspace near airports or along flight paths can lead to rapid operational suspensions. For travellers on the ground in areas experiencing ash fall, publicly available guidance from Indonesian authorities advises limiting outdoor exposure where possible, using masks and eye protection if ash is present, and following local instructions on cleaning ash from surfaces.
At present, there is no indication in official monitoring summaries that the Anak Krakatau eruption poses a tsunami risk similar to the 2018 flank collapse event, which caused significant coastal damage. The current concerns are focused on atmospheric ash, local air quality, and short-term travel disruption rather than on large-scale coastal evacuations.
Volcanologists note in recent publications that Anak Krakatau has a history of recurring eruptive phases, and Indonesian monitoring centres have maintained an elevated alert status since mid-2026. For travellers, this means that sporadic interruptions tied to renewed bursts of activity and ash emissions are possible even after the current disruption subsides. Those planning trips through western Indonesia in the coming weeks may benefit from monitoring official updates and maintaining flexible arrangements where feasible.
BMKG press release on Anak Krakatau ash and airport closures
Indonesia Transport Ministry update on extended airport closures