Anak Krakatau Eruption Shuts Six Indonesian Airports

A major eruption of Indonesia’s Anak Krakatau volcano has forced the temporary closure of six airports across western Indonesia, including Jakarta’s main international gateway, disrupting hundreds of flights and affecting tens of thousands of passengers as volcanic ash spreads over busy air corridors.

Airports Closed as Ash Cloud Spreads Over Western Indonesia

Volcanic ash from Anak Krakatau’s ongoing eruption led to the shutdown of multiple airports on Sunday, September 6, including Soekarno-Hatta International Airport near Jakarta, Halim Perdanakusuma in East Jakarta, Radin Inten II in Lampung, Budiarto in Tangerang, Pondok Cabe in South Tangerang, and Husein Sastranegara in Bandung. Publicly available information from Indonesia’s aviation authorities indicates that the closures were introduced in stages as ash was detected at different altitudes and locations over Java and Sumatra.

Soekarno-Hatta, Indonesia’s largest international hub, was closed after paper tests and monitoring detected volcanic ash over the airport area in the early hours of Sunday. Notices to airmen (NOTAMs) cited safety concerns for aircraft engines and flight operations, prompting a temporary suspension of all movements at the busy gateway. Similar tests and monitoring at Halim Perdanakusuma, Radin Inten II, Budiarto, Pondok Cabe, and Husein Sastranegara led to successive airport closures as the ash plume spread.

Government portals and aviation briefings describe the measures as precautionary steps in line with international safety standards for volcanic ash, which can severely damage aircraft engines, abrade windscreens, and impair visibility. The duration of each closure is being adjusted in response to changing ash distribution, with reopening times revised as new observations emerge.

Hundreds of Flights Disrupted and Passengers Stranded

The cascading airport closures have caused extensive disruption across Indonesia’s domestic and international networks. Updates from Indonesia’s Directorate General of Civil Aviation indicate that at least several hundred flights were affected by mid-morning on Sunday, as aircraft were grounded or diverted and airlines reworked schedules around the shut airspace.

At Soekarno-Hatta alone, regional news agencies report more than 200 flights cancelled or delayed, impacting tens of thousands of passengers on routes connecting Jakarta with major Southeast Asian cities and domestic destinations. Additional cancellations were reported for services linking Malaysian airports to the Indonesian capital, with airport operators in Malaysia confirming the disruption for Jakarta-bound flights.

Domestic travelers have been particularly affected, as several of the closed airports function as secondary hubs and training airfields serving the densely populated Jakarta–Bandung–Lampung corridor. Images and footage shared by Indonesian media show long queues at check-in areas and departure halls as travelers await updates, rebooking, or refunds from airlines and tour operators.

Airlines are diverting some services to unaffected airports such as Singapore and other regional hubs, while others are choosing to postpone flights entirely until visibility and engine safety can be assured. Travel industry observers note that further adjustments are likely over the coming days if ash dispersion remains unpredictable.

Volcanic Activity Intensifies After Weeks of Unrest

The latest eruption follows several weeks of increasing unrest at Anak Krakatau, a volcanic island in the Sunda Strait between Java and Sumatra. Indonesia’s geological monitoring bodies have reported a pattern of elevated seismic tremors, continuous eruption signals, and visible lava fountains since late July, with activity intensifying since Friday night.

According to briefings from Indonesia’s geological and meteorological agencies, the current phase involves sustained explosive activity and ash emissions reaching significant heights. Satellite observations and pilot reports cited in regional coverage describe ash columns rising to around 6,000 meters on the Java side of the volcano and up to roughly 15,000 meters toward Sumatra and parts of Banten province.

The eruption is the latest chapter in the modern history of the Krakatau volcanic complex, where the original Krakatoa eruption in 1883 produced one of the most powerful explosions in recorded history and triggered a devastating tsunami. Anak Krakatau, or “Child of Krakatau,” emerged from the submerged caldera in 1927 and has displayed intermittent eruptive behavior ever since, including a major episode in 2018 that caused a deadly tsunami following a flank collapse.

Specialists who monitor Indonesian volcanoes emphasize in publicly available commentary that Anak Krakatau’s current behavior is part of a longer pattern of episodic activity, though the combination of high eruption columns and prevailing winds makes this event particularly disruptive for aviation and communities in the downwind path of the ash.

Safety Measures for Aviation and Coastal Communities

Indonesia’s Meteorology, Climatology and Geophysics Agency is operating around-the-clock monitoring of the eruption, tracking ash dispersion, atmospheric conditions, and potential impacts on aviation routes over the Sunda Strait and western Java. Information shared via agency bulletins outlines continuous coordination with air navigation services, airport operators, and disaster management bodies to update hazard maps and flight advisories.

The country’s national disaster agency reports that local authorities around the Sunda Strait are distributing masks and advising residents to limit exposure to ash, particularly in areas of Banten and Lampung where fine particles have settled on roads, rooftops, and agricultural land. Health guidance circulated through public channels recommends residents avoid outdoor activity during heavy ashfall, secure water supplies from contamination, and protect vulnerable groups such as children and older adults.

For coastal communities and maritime traffic, monitoring also extends to sea conditions in the Sunda Strait. While there have been no immediate tsunami warnings linked to the current episode, officials and expert groups highlighted in public reporting are maintaining heightened vigilance due to Anak Krakatau’s history of structural instability and its location partly within a submarine caldera.

Travel advisories from regional tourism and aviation bodies encourage visitors planning to transit through Jakarta, Bandung, or Lampung to closely follow airline notifications and airport announcements, as schedules may change at short notice. Overland and sea routes between Java and Sumatra remain operational, but operators are monitoring visibility, ash accumulation, and potential disruptions to ferry services.

What Travelers Should Expect in the Coming Days

Forecasts for ash dispersion suggest that flight operations in western Indonesia may continue to face disruptions over the short term, particularly if eruptions remain continuous or intensify further. Meteorological models referenced in Indonesian media indicate that wind direction at cruising altitudes will play a critical role in determining which airports and air corridors are affected on any given day.

Airports that have reopened may still experience intermittent delays as air navigation providers reroute aircraft to avoid ash-dense sectors of airspace. Airlines are likely to implement rolling schedule changes, including last-minute cancellations, re-timings, and aircraft swaps as operational constraints evolve, especially for narrow-body jets serving shorter domestic and regional routes.

Travel planners recommend that passengers with imminent departures to or from Jakarta, Bandung, and Lampung maintain flexible itineraries, check flight status frequently, and allow extra time at the airport. For those traveling to holiday destinations in Indonesia, rerouting via alternative gateways, such as Bali’s Ngurah Rai or Surabaya’s Juanda airport, may be necessary if western Java’s airspace remains intermittently restricted.

Tourism stakeholders note that while the eruption has created significant logistical challenges, it has also renewed interest in Indonesia’s volcanic landscapes. However, visits to areas near Anak Krakatau remain subject to exclusion zones and maritime safety guidance, and travelers are advised to consult updated information before considering any volcano-viewing excursions.

Al Jazeera: Anak Krakatau eruption halts flights at Indonesia’s main airport

Indonesian Ministry of Transportation: Impact of Anak Krakatau eruption on Soekarno-Hatta operations

BNPB: Anak Krakatau activity and temporary closure of multiple airports

Bernama: Anak Krakatau eruption temporarily closes Soekarno-Hatta, disrupts flights