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Australian travellers heading to Indonesia are being urged to review plans after the eruption of Anak Krakatau pushed volcanic ash across western Indonesia, forcing airport closures, cancelling more than 1,500 flights and stranding about 170,000 passengers across the region.
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Volcanic ash shuts eight Indonesian airports
Mount Anak Krakatau, located in the Sunda Strait between Java and Sumatra, sent plumes of ash high into the atmosphere over the weekend, disrupting air traffic across western Indonesia. Indonesia’s main international gateway, Soekarno-Hatta International Airport near Jakarta, was among eight airports where operations were suspended as ash drifted into key flight paths.
Published coverage indicates that Soekarno-Hatta, more than 150 kilometres from the volcano, remained closed for extended periods as authorities assessed ash concentrations and visibility. Nationwide, more than 1,500 flights were delayed or cancelled at the affected airports, leaving terminals crowded with passengers seeking rebooking options or alternative routes.
Reports from aviation and news outlets state that about 170,000 travellers have been stranded by the cascading cancellations. While some domestic services have been rerouted through alternative airports such as Semarang and Surabaya, seat availability remains tight as airlines work through the backlog.
Indonesia’s disaster and geological agencies continue to monitor the volcano, which has shown elevated activity since July. Technical bulletins describe Anak Krakatau’s status as remaining at an alert level that restricts access within several kilometres of the crater, and note that eruptions have included ash columns reaching cruising altitudes for regional jets.
Australian travel advisory upgraded for Indonesia
The Australian government’s Smartraveller service has updated its Indonesia advice to highlight the Anak Krakatau eruption and associated transport disruption. The advisory notes that volcanic ash clouds have affected operations at major airports, including Jakarta, and that airports in affected areas may close at short notice, with flights delayed or cancelled.
Publicly available information on the advisory site urges travellers to monitor airline notifications closely and to check flight status before leaving for the airport. Travellers already in Indonesia are encouraged to remain in contact with airlines or travel agents, allow extra time for connections, and be prepared for itinerary changes if conditions persist.
The advisory also draws attention to the potential impact of ash on air quality. Travellers with asthma or other respiratory conditions are advised to take particular care, follow local health guidance and limit outdoor exposure if ashfall is reported in their area.
Insurance providers have begun issuing travel alerts referencing the eruption and the updated government advice. At least one Australian insurer has circulated guidance explaining how policy cover may apply when an official warning is in place, and recommends that travellers retain documentation of delays, cancellations and additional expenses linked to the volcanic activity.
Flight disruption for Australian routes and regional hubs
The ash cloud has reverberated across regional air networks, with services linking Australia and Indonesia among those affected. Coverage from Australian media indicates that Qantas cancelled several flights between Sydney, Melbourne and Jakarta as ash drifted through the capital’s airspace, leaving passengers needing rebooking on later services.
Indonesia’s transport ministry has reported that flights to and from Singapore have seen some of the heaviest disruption, alongside international routes connecting Jakarta with Sydney, Kuala Lumpur and Doha. Aviation trackers show knock-on delays across Southeast Asia as aircraft and crew are repositioned and airlines wait for updated assessments of airspace conditions.
Airlines normally rely on specialised volcanic ash advisories to adjust routing or temporarily suspend operations when ash concentrations pose a risk to jet engines. In this case, the proximity of ash to busy air corridors over western Java and Sumatra has limited opportunities for simple re-routing, forcing carriers to cancel or significantly delay departures.
For Australian travellers transiting through Indonesia to other Asian destinations, this has translated into missed onward connections and extended waits in terminal buildings or nearby hotels. Travel agents report that some customers are being rebooked via alternative hubs such as Singapore or Kuala Lumpur where seats are available, although capacity constraints and school holiday demand are limiting options.
Conditions on the ground: ferries, coastal areas and air quality
While air travel has borne the brunt of the disruption, Indonesian transport statements indicate that sea crossings in the Sunda Strait and surrounding areas continue to operate, with port authorities instructed to increase vigilance. Ships have been advised to monitor volcanic bulletins and avoid a designated exclusion radius around the volcano.
Local media coverage describes ashfall affecting parts of Lampung province in southern Sumatra and Banten province in western Java, where some residents and students reported eye irritation and reduced visibility. In response, schools in several districts suspended outdoor activities, and health guidance has recommended the use of masks and eye protection in areas where ash is settling.
Indonesia’s geological agency has reiterated that the current eruption sequence does not appear likely to trigger a tsunami. However, travel experts point out that Anak Krakatau has a history of hazardous events, including a 2018 eruption and flank collapse associated with deadly coastal waves. Tour operators are therefore exercising caution with excursions near the strait and are advising visitors to follow local safety instructions.
Travellers already in affected regions are being encouraged via public advisories to stay informed through local news, hotel notices and official online channels. Those with respiratory vulnerabilities are advised to remain indoors when ash levels are elevated, close windows and doors, and avoid driving in heavy ash conditions where possible.
What travellers should do now
For Australians planning imminent trips to Indonesia, travel industry guidance recommends first confirming whether flights are operating on the intended route and date. Many airlines are offering fee waivers or flexible rebooking options for passengers holding tickets to or from Jakarta and other affected airports over the coming days.
Travel insurers generally expect policyholders to take reasonable steps to minimise losses, which can include accepting alternative routings, adjusting travel dates within permitted windows, or using credits offered by airlines. Travellers are advised to keep records of all communications with airlines and agents, as well as receipts for accommodation, meals and local transport incurred due to delays.
Those already overseas and waiting for flights are encouraged by public advisories to remain patient and avoid travelling to the airport until flights are confirmed as operating. Conditions in airspace around Anak Krakatau may change quickly, and airport reopening times can shift as ash disperses or re-intensifies.
Given Indonesia’s large number of active volcanoes and the potential for rapid changes in alert levels, travel planners suggest building more flexibility into itineraries during peak activity periods. Monitoring official travel advisories, airline updates and local news before and during a trip can help travellers respond quickly if volcanic conditions affect transport links.
Smartraveller Indonesia advice
The Guardian coverage of Anak Krakatau disruption
Al Jazeera report on airport closures and stranded passengers