Anak Krakatau eruption strands 170,000 as 8 airports shut

A powerful eruption of Indonesia’s Anak Krakatau volcano has forced the closure of eight airports, disrupted more than 1,500 flights and left around 170,000 travellers stranded across the country, according to updated figures published on Monday.

Air travel across western Indonesia brought to a standstill

Publicly available transport data shows that Indonesia’s main international gateway, Jakarta’s Soekarno Hatta International Airport, together with nearby Halim Perdanakusuma and six regional airports, suspended operations after volcanic ash spread across key flight corridors on Sunday 6 September. The move triggered widespread cancellations and delays across domestic and international networks.

Reports indicate that by Sunday evening at least 1,558 flights had been cancelled, with Soekarno Hatta alone accounting for more than 900 affected services. The shutdown has rippled through airline schedules across Southeast Asia, impacting connections to Singapore, Kuala Lumpur, Bangkok and onward long haul routes to Europe, the Middle East and Australia.

Indonesia’s transport ministry, as cited in multiple media reports, has confirmed that eight airports remained closed into Monday morning local time as ash continued to drift over western Java and southern Sumatra. Operators are using rolling assessments of ash concentration to determine when individual airports can safely reopen.

Travel industry monitoring platforms show that airlines are undertaking large scale rebooking exercises, reallocating aircraft and adjusting schedules as they wait for clearance to resume normal operations. However, the continuing ash emissions and fast changing wind patterns make forward planning difficult.

170,000 travellers stranded as disruption spreads beyond Indonesia

Estimates compiled from aviation and government statements suggest that about 170,000 passengers have been directly affected by the airport closures so far, either stranded at terminals or unable to begin their journeys. Many are stuck in Jakarta, while others are waiting at secondary hubs in Lampung, West Java and on Sumatra’s southern tip.

The scale of the disruption means knock on effects are being reported well beyond Indonesia’s borders. Regional carriers that rely on Jakarta as a connecting hub are facing aircraft and crew out of position, leading to delays on routes that do not pass near Anak Krakatau. Travellers in cities such as Singapore and Kuala Lumpur have reported last minute cancellations of flights bound for Jakarta and other affected Indonesian airports.

Travel forums and social media posts from Monday morning describe long queues at ticket counters, crowded waiting areas and limited availability of alternative transport on key domestic corridors. With eight airports closed, options to reroute via unaffected Indonesian cities such as Surabaya, Denpasar or Makassar are constrained by aircraft availability and already high seasonal demand.

Some travellers with flexible itineraries have reportedly chosen to postpone trips or reroute through other Southeast Asian hubs to avoid the uncertainty around Jakarta. Others with fixed plans, including business travellers and those on tight international connections, face extended stays in airport hotels or city accommodation while they await confirmation of new flights.

Anak Krakatau’s renewed activity and ash hazard to aviation

Anak Krakatau, which sits in the Sunda Strait between Java and Sumatra, began showing increased activity in the days leading up to the airspace shutdown. Volcanology bulletins report repeated eruptions sending ash columns thousands of metres into the atmosphere, with some plumes reaching up to around 6,000 metres above Java and as high as 15,000 metres on the Sumatra side.

Satellite imagery and observations shared by Indonesia’s meteorological and volcanology agencies indicate that winds have carried ash across parts of Banten province in western Java and Lampung province in southern Sumatra. Those trajectories place the ash directly over busy air routes linking Jakarta with other Indonesian cities and international destinations.

Aviation safety protocols consider volcanic ash a significant hazard to jet engines and aircraft systems, even at relatively low concentrations. Standard practice is to keep aircraft out of affected airspace until monitoring data confirms that ash levels have dropped to acceptable thresholds. In this case, that has led to the broad closure of airports and temporary restrictions on surrounding airspace.

Specialist centres that track volcanic ash for aviation have been issuing regular advisories, which airlines and air navigation providers are using to plot alternate routings where possible. However, given Anak Krakatau’s proximity to Indonesia’s busiest air corridors, options for safe diversions around the plume remain limited while activity continues.

What travellers need to know if flying to or through Indonesia

For travellers with imminent plans to fly to or through Indonesia, publicly available airline and airport notices emphasize the importance of checking flight status frequently and avoiding travel to the airport until a confirmed departure time is available. Many carriers are offering free date or route changes for affected tickets issued over the weekend and early this week.

International passengers transiting through Jakarta are advised to contact airlines or travel agents to explore rerouting via alternate regional hubs such as Singapore, Kuala Lumpur or Bangkok. However, capacity on these routes may be tight in the short term as airlines attempt to accommodate stranded travellers and reposition aircraft.

Within Indonesia, rail and long distance bus operators are expected to see increased demand on main Java and Sumatra corridors as travellers seek alternatives to cancelled flights. Travellers considering overland options are being encouraged, in public advisories and online forums, to build in extra journey time and to purchase tickets as early as possible.

Travel insurance policies that cover natural hazards and trip disruption may help some passengers recover costs for unused flights, accommodation or missed connections. Policy wording varies, so travellers are being urged by consumer advocates to review coverage details and keep detailed documentation of cancellations and additional expenses.

Outlook: closures extended as authorities watch changing ash conditions

Notices from Indonesia’s transport ministry and state air navigation provider indicate that closures at the eight affected airports will remain in place at least through Monday morning, with review times based on updated ash forecasts. The situation remains fluid, and reopening decisions are expected to be phased and subject to rapid change as wind direction and volcanic activity evolve.

Volcanology updates published overnight report continued eruptions at Anak Krakatau, although the intensity of ash emissions has varied. Monitoring networks are tracking seismic activity, plume height and ash dispersal to assess any signs that the current eruption phase is stabilising.

For now, the prospect of further flight disruption remains high. Even once airports gradually resume operations, it is likely to take several days for airlines to clear backlogs, reposition aircraft and restore regular schedules. Travellers with nonessential trips to affected regions may find it easier to adjust their plans until flight operations become more predictable.

Local tourism bodies and travel operators are beginning to assess the short term impact on visitor numbers to western Java and southern Sumatra. While many Indonesian destinations, including Bali and much of central and eastern Indonesia, remain unaffected, the closure of key air gateways highlights how a single volcanic event can temporarily reshape travel patterns across one of the world’s busiest archipelagic aviation networks.

The Guardian: Volcano eruption in Indonesia leaves 170,000 travellers stranded

CNA: Eight Indonesian airports closed due to Anak Krakatau ash

Al Jazeera: Anak Krakatau eruption shutters Indonesian airports

ITV News: Hundreds of flights cancelled after Indonesian volcano erupts