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Volcanic ash from Indonesia’s Anak Krakatau has disrupted 2,961 domestic and international flights and left around 341,000 passengers stranded, as closures at major airports around Jakarta and across western Indonesia continue into a third day.
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Airports Across Western Indonesia Remain Closed
Publicly available information indicates that seven airports, including Jakarta’s Soekarno-Hatta International and Halim Perdanakusuma, remained shut on Monday, September 7, as ash from Anak Krakatau drifted across key air corridors. The closures followed a series of eruptions that began late on Friday, sending ash clouds to cruising altitudes and forcing air traffic controllers to suspend operations at multiple hubs.
Reports from Indonesian transport and aviation authorities compiled by local and international media state that at least 2,961 flights have been delayed, diverted, or canceled since the weekend. The disruption affects both domestic routes and regional services linking Indonesia with Australia and Southeast Asia, with several airlines rerouting aircraft via alternative gateways such as Singapore to avoid the ash-contaminated airspace.
Jakarta’s main gateway, Soekarno-Hatta, initially planned a phased reopening but extended its shutdown after monitoring showed ash still present in surrounding airspace. Coverage from aviation-focused outlets notes that airport operators are keeping runways and taxiways closed while teams assess contamination risks and conduct inspections of airport infrastructure and grounded aircraft.
Advisories from the Darwin Volcanic Ash Advisory Centre, referenced in Indonesian-language briefings, indicate that ash clouds from Anak Krakatau have reached altitudes near 50,000 feet and moved westward over the Sunda Strait and into the Indian Ocean. As long as ash remains detectable along approach and departure paths, restrictions on flight operations are expected to remain in force.
Hundreds of Thousands of Travelers Stranded
According to consolidated figures widely cited by national news agencies and international media partners, approximately 341,000 passengers have been affected by the cascading disruption. The total covers travelers whose flights were canceled outright, significantly delayed, or diverted to airports far from their original destinations.
Images and on-the-ground accounts shared through news outlets and social media show crowded terminals at Jakarta’s airports, with passengers queuing at airline counters for rebooking and accommodation assistance. Some international travelers bound for Indonesia have found themselves stuck in regional hubs such as Singapore and Ho Chi Minh City, as airlines adjust schedules and wait for clearance to re-enter Indonesian airspace.
Reports suggest that many domestic passengers are turning to overland or sea transport where possible, particularly on routes across Java and Sumatra. However, with four provinces shifting schools to online learning and local authorities advising residents to limit outdoor activity in areas affected by ash fall, road and ferry travel is also facing intermittent disruption.
Travel advisories from foreign governments, including Australia, urge passengers heading to or transiting through Indonesia to check flight status directly with airlines before leaving for the airport. International tourism and aviation sites highlight that even travelers whose routes do not pass directly over Anak Krakatau may encounter knock-on delays due to altered aircraft rotations and crew scheduling constraints.
Why Volcanic Ash Grounds Aircraft
The wide-ranging disruption underscores how sensitive modern aviation is to volcanic ash. Information from aviation safety bodies explains that ash clouds contain microscopic particles of rock and glass that can damage jet engines, pit windscreens, and interfere with onboard instruments. Unlike typical weather systems, ash clouds can be difficult to detect visually or on standard radar, making conservative airspace management essential.
In previous events, such as the Eyjafjallajökull eruption in Iceland in 2010, large portions of European airspace were closed for days as a precaution, stranding millions of passengers worldwide. Analysts note that the current Anak Krakatau episode, while regional in scale, follows the same safety-first approach, prioritizing engine integrity and passenger safety over schedule reliability.
Specialized advisory centers, including the Darwin VAAC that covers much of the Indonesian region, monitor satellite imagery, ground observations, and pilot reports to map ash dispersion in near real time. Airlines and air navigation authorities rely on this data to draw no-fly zones, design alternative routings, and determine when it is safe to resume normal operations once ash concentrations diminish.
Aviation analysts quoted in industry reports emphasize that even after visible ash clears, airports may need additional time to inspect and clean runways, taxiways, lighting systems, and ground equipment. Aircraft parked on the ground during ash fall events also require detailed checks of engines and airframes, extending recovery timelines beyond the end of the eruption itself.
Economic and Operational Impact on Indonesian Aviation
Business publications tracking the disruption estimate that Indonesian airlines could be losing more than 1 million US dollars per day in revenue and additional costs. Local airline associations cited in financial coverage point to lost ticket income, fuel and crew expenses linked to diversions, and the cost of accommodating stranded passengers as key contributors to the mounting bill.
For Indonesia’s aviation sector, which has spent recent years expanding domestic connectivity and opening new international routes, the Anak Krakatau event is an unplanned stress test. Analysts observe that carriers are now juggling fleet positioning, maintenance windows, and regulatory duty-time limits for flight crews, all while trying to preserve key long-haul connections and minimize cancellations on heavily used domestic trunk routes.
Airports in Jakarta and nearby regions have also been forced into rapid contingency planning. Operational summaries published by local media describe temporary closures of terminals, reconfiguration of passenger flows, and the deployment of additional staff to manage rebooking lines and crowd control. Ground handling companies are contending with packed aprons and aircraft parked out of their usual positions as flight banks collapse and rescheduling efforts begin.
Tourism-dependent areas such as Bali are watching developments closely. While Bali’s main airport has largely remained open with only scattered schedule changes, travel-industry reporting notes that the disruption to Jakarta’s role as an international gateway is affecting inbound itineraries, onward connections, and confidence among travelers planning near-term trips to Indonesia.
Monitoring Anak Krakatau and the Wider Risk Picture
Anak Krakatau, or “Child of Krakatau,” rose from the caldera of the volcano whose catastrophic 1883 eruption produced powerful tsunamis and widespread climatic effects. More recently, a flank collapse at Anak Krakatau in December 2018 generated a deadly tsunami in the Sunda Strait, an event that has shaped how local communities and disaster agencies view the volcano’s hazards.
Geological summaries consulted by news organizations describe Anak Krakatau as a highly active stratovolcano that has been in an elevated state of unrest for much of the past decade. Indonesian monitoring agencies raised its alert level earlier in 2026 following increased seismicity and ash emissions, with exclusion zones established within several kilometers of the crater.
Current coverage emphasizes that, despite the dramatic ash plumes and aviation disruption, there is no indication of a tsunami similar to 2018 at this stage. Agencies monitoring coastal conditions in Banten and Lampung provinces are maintaining heightened observation of sea-level changes and advising residents and fishers to respect safety perimeters around the island.
For travelers, the episode is a reminder that Indonesia sits along the Pacific “Ring of Fire,” where active volcanoes and seismic events occasionally intersect with transport systems. Travel experts recommend building flexibility into itineraries during the current period, maintaining close contact with airlines and tour operators, and staying informed through official advisories and reputable news outlets as the situation around Anak Krakatau continues to evolve.
ANTARA News: Anak Krakatau ash disrupts 2,961 flights
CNA: Several Indonesian airports remain shut due to ash