The eruption of Mount Anak Krakatau has affected 2,961 flights and stranded approximately 341,000 passengers as of Monday, September 7, according to Indonesian Transportation Minister Dudy Purwagandhi. For Australian travel insurance brokers, those numbers are context. The real question is narrower: when did this eruption become a “known event,” and has each client’s insurer actually said so in writing?
The continuous eruption began on Friday, September 4, at 11:07pm local time and officially ended on Sunday, September 6, at 12:04am. That is the timeline set out in an evaluation report from Lana Saria, head of the Geological Agency at Indonesia’s Ministry of Energy and Mineral Resources, reported by ANTARA News. “Following the end of that episode, Mount Anak Krakatau’s volcanic activity transitioned back to Strombolian eruption characteristics,” Saria said.
The volcano had been at Level III – the second highest on Indonesia’s four-tier warning scale – since July 2, when the Geological Agency raised the alert after a surge in seismic activity. “The increase in activity indicates a magma supply moving toward the surface,” Saria said at the time.
As of Monday, seven airports remained closed while authorities awaited aviation-safety clearance from the Darwin Volcanic Ash Advisory Centre (Darwin VAAC), the Australian Bureau of Meteorology (BoM)-operated body responsible for volcanic ash advisories across the region.
“We are taking a conservative approach because wind conditions are very dynamic. We want to ensure that volcanic ash moves away from airports surrounding Mount Anak Krakatau,” Purwagandhi said.
Cover-More has previously used Darwin VAAC and BoM data when determining whether a volcanic ash event had concluded – and whether subsequent eruptions qualified as a new coverable event. In a December 2015 advisory on Mount Rinjani, Cover-More said the event was considered concluded after the BoM and Darwin VAAC ceased providing updates, and that any further eruptions would be treated as a new event with cover potentially available subject to policy terms. A later Rinjani update applied the same logic.
Cover-More’s travel-alert page does not currently list a specific advisory for the September 2026 Anak Krakatau eruption. There is no publicly posted cut-off date. Brokers should confirm the applicable position directly with the insurer rather than assume a particular disruption date determines coverage.
The timing question is genuinely complicated. Darwin VAAC issued volcanic ash advisories for Krakatau from September 4, documenting ash at altitudes up to FL500 – roughly 50,000 feet – and forecasting its movement. The BoM separately issued SIGMETs for affected flight information regions, including the Jakarta FIR. Darwin VAAC provides aviation advisories; it does not authorise Indonesian airports to reopen.
The eruption date, the first advisory, the first flight cancellation, and an insurer’s determination of when an event became known are not the same thing. Brokers should not assume a September 5 cut-off simply because that is when widespread flight disruption was reported – they need the insurer’s own determination and policy wording.
CHOICE published guidance on September 7 stating that policyholders may be covered “if bought the policy before the volcano affected flights on Saturday 5 September 2026.” It also explicitly cautions that “insurers’ definitions can vary so it's best to check with your insurer on when they cut off cover for a specific event,” and advises that “if it’s a major disaster, insurers will often publish specific advice on their website.”
The Insurance Council of Australia (ICA) confirmed that coverage is not uniform across the market. “Travel insurance policies can provide cover for unexpected events such as volcanic eruptions and ash clouds, but cover varies between insurers and policies. Travellers should check their Product Disclosure Statement (PDS) to understand what their policy covers and any exclusions that may apply,” an ICA spokesperson told ABC News.
Indonesia was the most popular overseas destination for Australians in 2025-26, accounting for approximately 14% of all Australian overseas trips. Australians took 12.7 million overseas trips that year, up 4%, according to the Australian Bureau of Statistics (ABS). Statistics Indonesia recorded 1,754,791 Australian tourist visits in 2025, with Indonesia's Tourism Ministry targeting 2.23 million for 2026.
Both Qantas and Virgin Australia confirmed Bali routes were unaffected. The Jakarta corridor, however, is one of the highest-volume outbound travel insurance corridors in the Australian market.
