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About 170,000 travellers were left stranded across Indonesia over the weekend after ash from the erupting Anak Krakatau volcano forced the closure of eight airports, including Jakarta’s main international gateway, triggering widespread flight cancellations and regional travel disruption.
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Airports closed across western Indonesia
Published coverage indicates that Indonesia temporarily halted operations at eight airports on Sunday 6 September after Anak Krakatau sent a dense ash cloud across parts of western Java and southern Sumatra. The closures included Soekarno Hatta International Airport, the primary hub for Jakarta, and Halim Perdanakusuma Airport, which handles a mix of commercial and government traffic, along with several regional airports closer to the Sunda Strait.
Reports from Indonesia’s transport authorities and local media show that the affected airports together handled more than 1,500 flights on the day of the disruption. By Sunday evening, at least 1,558 flights were reported cancelled or heavily delayed, leaving roughly 170,000 passengers unable to travel as scheduled. International services linking Jakarta with key hubs such as Singapore, Kuala Lumpur, Doha, Sydney and Amsterdam were among those impacted.
Information compiled by regional news outlets indicates that the closures are being reviewed in rolling blocks of several hours, depending on evolving ash forecasts and airborne testing. While some facilities initially planned shorter shutdowns in the early hours of Sunday, the spread and persistence of the ash cloud prompted multiple extensions, with several airports expected to remain closed or operating at reduced capacity into Monday 7 September.
The disruption has effectively severed Indonesia’s main aviation corridor for at least 24 hours, affecting both domestic connectivity between major islands and international links used by long-haul carriers and regional low-cost airlines. Travellers scheduled to connect through Jakarta to destinations across the archipelago have been particularly exposed to missed onward flights and forced layovers.
Scale of disruption for travellers
Coverage from international and Indonesian outlets describes crowded terminals at Soekarno Hatta and other affected airports, with passengers facing long waits for rebooking and limited information as schedules were repeatedly adjusted. Airline operation teams have been working with constrained options, as diversions to nearby airports are complicated by the fact that multiple hubs across western Java and southern Sumatra are experiencing the same ash conditions.
Major carriers in the region have begun activating disruption policies, including options for date changes, refunds or travel credits for customers booked on flights to, from or via Jakarta and other suspended airports in the period immediately after the eruption. According to Australian and regional reports, some airlines serving Jakarta from Australia and Southeast Asia have issued travel advisories through at least 9 September, signalling that knock-on effects could continue even after airports begin to reopen.
Publicly available information from aviation tracking platforms shows a sharp drop in movements at Jakarta’s main airport from late Saturday into Sunday, with many long-haul arrivals diverted to alternative hubs in Southeast Asia or returning to origin. Domestic routes between Jakarta and cities such as Surabaya, Denpasar and Makassar have also seen large numbers of cancellations, complicating plans for both Indonesian residents and international tourists using Jakarta as a transit point.
Passengers already in Indonesia but flying onward to other parts of Asia, Australia or the Middle East are particularly affected, as the closure of Jakarta has created bottlenecks in securing seats on later departures once conditions improve. Reports also highlight travellers stranded in regional centres such as Lampung and Bandung, where local airports are part of the same airspace restrictions.
Volcanic ash and aviation safety
Anak Krakatau, located in the Sunda Strait between Java and Sumatra, has produced a series of eruptions since late Friday, with satellite imagery and pilot reports indicating ash columns rising several kilometres into the atmosphere. Aviation forecasting centres have issued volcanic ash advisories for sectors of Indonesian airspace that cover major flight paths into Jakarta and across western Indonesia.
Volcanic ash poses a significant risk to aircraft engines and flight instruments, and international aviation standards require operators to avoid known ash clouds even when visibility at ground level appears acceptable. Historical case studies cited by geological and aviation safety agencies show that encounters with ash can lead to engine flameouts, abrasion of cockpit windows and contamination of critical sensors, which is why airport closures and route suspensions are typically implemented as a precaution whenever ash is detected.
Reports on the current Anak Krakatau episode indicate that ash has been detected not only visually but also through specialised sampling and meteorological modelling around Jakarta’s airports. With winds carrying fine particles over a wide area, air navigation authorities have opted for broad airspace restrictions rather than relying solely on localised closures. This approach aims to reduce the risk of aircraft inadvertently entering contaminated air corridors during arrivals and departures.
Geological agencies monitoring Anak Krakatau classify the current activity as significant but within the range of what has been observed at the volcano in recent decades. While there is no immediate indication from official bulletins of a larger, tsunami-generating collapse event like that of 2018, the pattern of frequent explosions and sustained ash emission is enough to prompt extended caution for aviation and coastal communities in the vicinity.
Operational response and alternative routes
According to Indonesian transport and airport operators’ public statements cited in local media, authorities have opened or designated at least five alternative airports to help absorb some of the diverted traffic while the main eight hubs remain closed or constrained. These include airports outside the primary ash plume footprint, providing options for emergency diversions and limited scheduled services.
Despite these contingency measures, the sheer volume of traffic normally handled by Jakarta and neighbouring airports means that most travellers are being advised to postpone or reroute their journeys rather than attempting immediate workarounds. Travel advisories from foreign ministries in the region urge passengers to monitor airline notifications closely, maintain flexible plans and be prepared for sudden changes as ash forecasts are updated.
For Indonesia’s domestic tourism and business sectors, the timing of the eruption at the start of the working week is adding to the impact, delaying trips for commuters, government workers and business travellers alongside holidaymakers. Hotels near major airports are reporting higher occupancy from stranded passengers seeking overnight stays while awaiting new flight options, according to local press coverage.
Regional aviation analysts quoted in recent coverage suggest that once the ash cloud dissipates and flight operations resume, airlines will likely prioritise clearing backlogs on trunk routes such as Jakarta–Singapore, Jakarta–Kuala Lumpur and Jakarta–Denpasar. However, secondary routes and smaller regional airports could experience longer recovery times as aircraft and crews are repositioned.
What travellers should know now
Travel industry reports emphasise that passengers with upcoming trips involving Jakarta or western Indonesia in the next several days should check their airline or booking platform before heading to the airport, even if their departure city appears unaffected. Many carriers are allowing fee-free changes for tickets issued before the eruption date, but policies differ by airline and route.
Insurance comparisons and government travel advisories note that many comprehensive travel insurance policies treat major volcanic eruptions as natural disaster events that may be covered if the policy was purchased before the eruption became a widely known issue. Travellers are encouraged in publicly available guidance to review their policy wording carefully and keep documentation of cancellations and additional expenses.
With Anak Krakatau’s activity still ongoing as of Monday 7 September, forecasts for aviation remain subject to rapid change. Meteorological agencies and volcanic ash advisory centres continue to issue updated charts used by airlines and air traffic control to plan routes around the plume. For now, industry observers expect a phased reopening of airports, followed by several days of schedule adjustments as airlines work through the backlog of stranded passengers.
For travellers planning future trips to Indonesia, expert commentary appearing in regional media stresses that the country’s vast size means that even a disruptive eruption in one corridor does not necessarily affect tourism hotspots thousands of kilometres away. However, the current situation around Anak Krakatau is a reminder of how quickly volcanic activity can ripple through air travel networks, and why flexible itineraries and real-time information are essential for journeys across the archipelago.
CNA: Eight Indonesian airports remain shut due to volcanic ash from Anak Krakatau
AP News: Volcanic island in Indonesia erupts, canceling hundreds of flights
ABC News: Mount Anak Krakatau eruption halts Jakarta flights
Euronews: Volcano in Indonesia erupts, canceling hundreds of flights