Anak Krakatau Ash Disrupts 624 Flights at Jakarta Hub

Volcanic ash from Indonesia’s Mount Anak Krakatau has continued to disrupt air traffic over western Java, with publicly available data showing that 624 flights scheduled at Jakarta’s Soekarno-Hatta International Airport on Monday were delayed or unable to depart as airport operations remained largely suspended.

Jakarta’s Main Gateway Struggles Through Second Day of Disruption

Flight information published by airport operator InJourney Airports and reported by Indonesian media indicates that Soekarno-Hatta International Airport entered a second consecutive day of heavily curtailed operations on Monday, 7 September 2026. The disruption followed a sustained eruption of Mount Anak Krakatau in the Sunda Strait, which pushed ash clouds toward the capital region.

Airport data cited in local coverage shows that 624 flights were on the schedule at Soekarno-Hatta on Monday, comprising 461 domestic services, 156 international flights and seven cargo operations. With the airport’s airspace still affected by drifting ash, these services were recorded as delayed, pending further updates on visibility and ash concentration along key flight paths.

Some outlets describe the airport as technically closed for most commercial operations, even as passengers continued to arrive at terminals hoping for movement on their bookings. Photographs from the terminal complex show busy check in halls and departure boards filled with cancellations and delays while airlines worked through revised operating windows.

Regional news agencies also report that eight airports across Indonesia, including Soekarno-Hatta and Jakarta’s Halim Perdanakusuma, have faced full or partial closures since Sunday as ash spread across parts of Java and southern Sumatra.

Scale of the Eruption and Ash Cloud over Western Java

Monitoring from Indonesia’s Geological Agency and international volcanic ash advisory services, as summarized in recent news coverage, shows that Anak Krakatau entered an extended eruptive phase over the weekend. Reports describe ash plumes reaching around 6 kilometers into the atmosphere, with satellite imagery tracking at least two distinct ash clouds drifting northeast over Jakarta, Banten and West Java.

The eruption has been characterized as one of the more disruptive events in the region since earlier high profile volcanic incidents that affected Southeast Asian aviation. Television and wire service images show incandescent material at the summit of Anak Krakatau and dense ash columns rising over the Sunda Strait, approximately 150 kilometers from Jakarta’s main airport.

Publicly available assessments note that the ash particles pose a significant hazard to jet engines, prompting aviation authorities to prioritize safety by closing or restricting airspace even when weather at ground level appears relatively clear. Flight suspensions have therefore been based largely on airborne ash modeling and remote sensing data rather than surface visibility alone.

As of Monday afternoon local time, official online updates on the eruption indicated that activity had begun to ease compared with the peak over the weekend, although the ash distribution remained sufficient to keep key routes under review.

Airlines Cancel and Reroute as Passengers Seek Alternatives

Major regional carriers publicly announced widespread adjustments to their Jakarta schedules in response to the evolving ash advisories. Statements posted on airline websites show that all AirAsia services to and from Jakarta were cancelled or rescheduled after the temporary closure of Soekarno-Hatta, with customers offered options to change travel dates or rebook on alternative routes.

Coverage of long haul operations notes that international carriers such as Singapore Airlines and Qantas also altered flights, with some services cancelled and others delayed or re timed around potential reopening windows. Travel alerts published by these airlines outline flexible rebooking and refund policies for passengers booked through the first half of the week.

Local media reports highlight growing queues at airline service desks in Soekarno-Hatta’s terminals as stranded travelers seek clarity on new departure times. Some domestic routes have been rerouted via airports less affected by ash, while a portion of regional and domestic flights have been diverted to or from cities such as Surabaya and Yogyakarta, depending on airspace conditions.

Social media posts and user generated reports from inside the terminals describe extended waiting periods but generally orderly conditions, with many passengers monitoring airline apps and airport screens for signs of an updated departure sequence once restrictions are lifted.

Wider Impact Across Indonesia’s Aviation Network

National level updates published by Indonesian government channels outline wider disruption beyond Jakarta. In addition to Soekarno-Hatta, temporary suspensions or restrictions have been reported at Halim Perdanakusuma in Jakarta, Radin Inten II in Lampung, Budiarto in Curug and several other airports across Sumatra and Java.

Bernama and other regional outlets estimate that more than 240 flights were disrupted at Soekarno-Hatta on Sunday alone, affecting close to 30,000 passengers, with further delays and cancellations accumulating into Monday as the total number of impacted flights rose past 600. The combination of airport closures, shifting ash patterns and limited spare capacity elsewhere has created a complex puzzle for airlines seeking to reposition aircraft and crews.

Domestic carriers including members of the Lion Air Group have detailed a series of cancellations across routes into and out of Jakarta and Halim Perdanakusuma, citing the ash hazard along critical approach paths. Some of these routes serve eastern Indonesia, leaving travelers from regions such as Sulawesi and the Maluku Islands facing lengthy rebooking timelines.

Travel industry observers quoted in regional coverage suggest that the knock on effects may continue for several days even after ash levels subside, as airlines work through backlogs and reposition aircraft. Travelers planning to transit through Jakarta this week are being urged, via airline and airport advisories, to monitor their flight status closely and consider flexible routing where possible.

Ongoing Monitoring and Guidance for Travelers

Public information from Indonesian authorities indicates that volcanic ash monitoring remains active, with meteorological services and the Volcanic Ash Advisory Center coordinating updates on ash movement. Government communications outline a focus on safety in the aviation sector, with reopening decisions tied to real time observations and forecasting rather than fixed timelines.

International aviation guidelines emphasize that aircraft should avoid visible ash and areas where concentrations cannot be reliably assessed. In practice, this means that even intermittent eruptions such as those at Anak Krakatau can trigger prolonged restrictions if ash lingers along heavily used corridors, especially around a primary hub like Jakarta.

For travelers, published guidance from airlines and airports highlights several key steps: checking flight status before heading to the airport, confirming contact details within airline booking profiles, and considering travel insurance coverage for disruption related expenses. Many carriers are waiving change fees for affected flights, although specific conditions vary by airline and ticket type.

With Anak Krakatau’s activity still under observation, aviation and disaster management agencies continue to update the public through official websites and social media channels. Travelers with imminent plans involving Jakarta and western Indonesia are advised, according to these publicly available notices, to remain alert to schedule changes and to allow additional time for rebooking or rerouting if disruptions persist.