Anak Krakatau Eruption Closes 8 Indonesian Airports
It was the kind of Sunday morning nobody plans for. Travelers who had booked flights out of Jakarta’s Soekarno-Hatta International Airport arrived to find departure boards frozen, queues snaking out of terminal doors, and airline staff overwhelmed. By midday on September 6, Indonesian authorities had suspended operations at eight airports across the country, leaving roughly 170,000 passengers stranded - all because a volcano that last grabbed global headlines in 1883 had woken up again.
Mount Anak Krakatau - “Child of Krakatoa” - erupted at 11:07 PM local time on Friday, September 5, 2026. The continuous eruption lasted approximately 25 hours, sending a plume of volcanic ash and lava skyward before ending just after midnight on Sunday. Two additional eruptions followed on Sunday, according to Indonesia’s volcanology agency PVMBG. The eruptions produced booming sounds audible from several hundred kilometres away, and ash clouds climbed to altitudes of up to 50,000 feet in some directions.
What followed was one of the most disruptive aviation events in Southeast Asia in years.
Eight Airports Shut Down
Ash from the eruption drifted into the airspace around Soekarno-Hatta International Airport, the country’s main international hub and Southeast Asia’s second-busiest airport by seat capacity - handling 3.24 million scheduled airline seats this month alone. Indonesian authorities had little choice but to shut it down.
The closure cascaded to seven other airports, including:
- Husein Sastranegara Airport in Bandung
- Radin Inten II Airport near Bandar Lampung in southern Sumatra
- Six additional regional airports across Java and Sumatra
By the final count on Sunday, 1,558 flights had been delayed or cancelled across all eight airports. More than 900 of those were flights to or from Soekarno-Hatta alone.
The disruption extended well beyond Indonesia’s borders. Singapore Airlines cancelled nine flights on the Singapore-Jakarta route scheduled for Monday. Its budget carrier Scoot followed with its own cancellations on the same route. For travelers trying to connect through Singapore’s Changi Airport into Jakarta - a routing popular with business travelers from Australia, Europe, and North America - the options dried up fast.
Indonesian transport minister Dudy Purwagandhi said authorities were directing diverted traffic to alternative airports in Semarang and Surabaya, both further along Java’s northern coast and outside the ash dispersal zone.
What’s Happening Right Now
As of Monday, September 7, the situation remains fluid. Airport suspension orders have been extended multiple times, with the latest extension pushing through 8:59 AM local time. Flight cancellations are continuing into Monday, and Indonesia’s meteorological agency BMKG has confirmed that volcanic ash was detected across Jakarta and several surrounding regions, extending as far as the Indian Ocean.
Jakarta’s city government closed public schools today and shifted classes online until the ash situation improves. In Bandar Lampung - the city closest to the Sunda Strait on the Sumatran side - volcanic ash blanketed parked cars and roadsides. Residents there expressed concern about respiratory health effects.
The core problem is that this eruption may not be finished. PVMBG head Lana Saria confirmed that “seismic activity indicates the movement or release of volcanic fluids within the volcanic system,” and that the “timing, magnitude, and nature of the next eruption cannot be precisely predicted.” The Ministry of Energy and Mineral Resources is warning that the potential for further eruptions in the coming period remains high, with possible hazards including incandescent rock ejection, heavy ashfall, and lava flows if continuous eruptions resume.
Anak Krakatau currently sits at Level III, “Alert” - the third of four alert levels in Indonesia’s volcanic monitoring system. Authorities have maintained a 3-kilometre exclusion zone around the volcano. Ships passing through the Sunda Strait have been asked to increase vigilance and stay clear of that exclusion zone.
Why the Name Krakatoa Carries Such Weight
The 1883 eruption of the original Mount Krakatoa was one of the deadliest volcanic disasters in recorded history. An estimated 35,000 people died, and the explosion was heard as far away as Australia. The caldera that formed in 1883 is now partly submerged in the Sunda Strait, and Anak Krakatau emerged from the sea in the 1920s within that same caldera. It has been sporadically active ever since, with a significant eruption in December 2018 triggering a tsunami that killed more than 400 people in surrounding coastal communities.
The volcano sits roughly 150 kilometres from Jakarta’s airport. That geographic position - in the narrow body of water separating Java and Sumatra - is precisely what makes eruptions here so disruptive to aviation. Ash does not fall predictably. It drifts with upper-level winds, and those winds can carry volcanic ash hundreds of kilometres from the source in directions that shift hour by hour.
If You’re Traveling to Indonesia Right Now
Whether you are already in the country or have a trip booked in the coming days, here is a practical breakdown of what to do.
Check before you go to the airport. Do not assume your flight is operating. Check your airline’s app or website directly - or call the airline - before heading to the terminal. The situation has been changing hourly, and arriving at Soekarno-Hatta without confirmation of your flight status adds to the chaos for everyone. Citilink passengers queued for hours on Sunday for refunds and rebooking without any confirmation their flights were even cancelled.
Contact your airline about rebooking. Airlines affected by a natural disaster-related closure are generally obligated to offer rebooking without fees or full refunds for cancelled flights. Indonesian domestic carriers including Garuda Indonesia, Lion Air, and Citilink have been among those most affected. Singapore Airlines and Scoot have published formal travel advisories covering affected Jakarta routes - check their websites directly for the most current information.
Consider alternative departure points. If you need to leave Java and your flight through Jakarta is cancelled, Semarang’s Ahmad Yani Airport and Surabaya’s Juanda International Airport are the two main alternatives the transport ministry is recommending. Expect crowded terminals and limited seat availability on short notice.
Protect yourself from the ash. Volcanic ash is not the same as smoke or ordinary dust - it contains fine particles of rock and glass that are harmful to inhale, even in low concentrations. If you are in Bandar Lampung, Jakarta, or any area where ash has fallen: stay indoors when possible, keep windows closed, and wear an N95 or KN95 mask if you need to go outside. Standard surgical masks and cloth masks do not filter volcanic ash particles effectively.
Monitor real-time updates. Follow Indonesia’s BMKG (the national meteorological and geophysics agency) for real-time updates on ash dispersal and airport conditions. The civil aviation directorate has been posting airport status updates on Instagram as conditions change.
What Your Travel Insurance Covers
This is where timing matters a great deal.
If you purchased travel insurance before September 5, 2026, the eruption was unforeseeable at the time of purchase. Your policy should treat the disruption as a covered event under its standard terms. Here is what to look for in your policy documents:
Trip delay coverage reimburses you for additional meals, hotel nights, and local transportation if your flight is delayed beyond the qualifying threshold - typically three to twelve hours, depending on your policy. Given that many travelers have been stranded for more than 24 hours, this coverage can make a meaningful financial difference. Keep every receipt.
Trip interruption coverage applies if you are already on your trip and need to return home early due to the disruption. It can cover the cost of a new one-way ticket home and reimburse unused, non-refundable portions of your original booking.
Trip cancellation coverage is relevant if you haven’t left yet and decide not to travel because of ongoing airport closures. Your policy needs to list natural disasters or volcanic eruptions as a covered reason - most comprehensive travel insurance policies do.
One critical caveat: if you are purchasing travel insurance now, after the eruption has been widely reported, most providers will exclude Anak Krakatau-related disruptions from coverage because the event is no longer unforeseeable. This is standard across the industry. If you are booking a future Indonesia trip and want protection against volcanic disruption, look for a “Cancel for Any Reason” add-on, which reimburses a portion of trip costs regardless of why you cancel.
File a claim as soon as practical. You will need receipts for every additional expense, your original booking confirmations, and documentation of the cancellation or delay from the airline.
What to Watch in the Coming Days
The key question is whether Anak Krakatau produces further significant eruptions. PVMBG has made clear it cannot predict the timing or scale of any future activity. With the volcano remaining at Level III and two additional eruption pulses recorded on Sunday, the agency is taking the threat of resumed continuous activity seriously.
Travelers with flights through Jakarta in the next 48-72 hours should stay closely in touch with their airlines. Even if the airport reopens fully today, working through the backlog of cancelled and delayed flights can take several days, meaning rebooking into your preferred routing may not be immediate.
For travelers headed to Bali, Lombok, or other Indonesian destinations that typically connect through Jakarta, it may be worth exploring whether routings through other regional hubs - Singapore’s Changi, Kuala Lumpur’s KLIA, or Hong Kong - can get you to your destination while the Jakarta situation remains uncertain.
Sitata’s travel safety platform monitors volcanic activity, airport closures, and government advisories in real time and sends alerts directly to travelers’ phones when situations like this develop. Indonesia sits on the Pacific Ring of Fire, alongside the Philippines, Japan, and much of Latin America - active volcanic risk is a genuine planning consideration for trips across the region. You can explore travel safety tools and travel insurance options before your next trip.
