Indonesia Volcano Eruption: Anak Krakatau Disrupts Nearly 3,000 Flights and Affects 341,000 Travelers

 September 7, 2026 | International News

Indonesia is facing major travel disruption after Mount Anak Krakatau erupted repeatedly, sending volcanic ash high into the atmosphere and forcing airports to suspend operations.

The eruption has affected aviation across parts of Indonesia, including important airports serving Jakarta and other major destinations. According to the latest Reuters report on September 7, approximately 341,000 travelers have been affected and nearly 3,000 flights have been cancelled or delayed. Seven Indonesian airports remained closed because of volcanic ash.

The situation is being closely monitored because volcanic ash can create serious risks for aircraft engines and flight operations.

Mount Anak Krakatau Erupts Gain 

Mount Anak Krakatau is located in the Sunda Strait between the Indonesian islands of Java and Sumatra.

The volcano began erupting in late September 4, with activity continuing over the following days. The latest eruptions produced large ash clouds that spread toward populated areas and into important air routes.

Authorities reported that ash reached altitudes of approximately 50,000 feet in some areas. This created a major aviation hazard because aircraft flying through dense volcanic ash can suffer severe engine and equipment damage.

The eruption has therefore affected not only passengers traveling directly near the volcano but also flights operating through surrounding Indonesian airspace.

Thousands of Flights Disrupted

The initial disruption was already significant.

On Sunday, Indonesian authorities reported that 1,558 flights had been delayed at eight affected airports, with approximately 170,000 passengers stranded.

By Monday, however, the overall impact had increased substantially.

Reuters reported that nearly 3,000 flights had been cancelled or delayed and approximately 341,000 travelers had been affected. Seven airports, including two serving Jakarta, remained closed because of volcanic ash.

The changing figures reflect the continuing impact of the eruption and the difficulty of restoring normal flight schedules while volcanic ash remains in the atmosphere.

Jakarta Airports Among Those Affected

One of the most important effects has been on aviation in the Jakarta area.

Soekarno-Hatta International Airport, Indonesia's main international airport, suspended flight operations because of volcanic ash. Another Jakarta airport, Halim Perdanakusuma, was also affected.

The disruption has caused passengers to wait for updates, search for alternative flights and deal with cancellations and delays.

Images from Indonesian airports have shown passengers waiting inside terminals while airlines work to rearrange their schedules.

Because Jakarta is a major regional aviation hub, disruption there can have consequences for flights connecting Indonesia with other Asian and international destinations.

Bali Flights Also Affected

The eruption has also caused flight disruptions involving Bali, one of Indonesia's most popular tourist destinations.

Passengers at I Gusti Ngurah Rai International Airport in Bali faced cancellations involving flights to Jakarta. Reuters images from September 7 showed passengers waiting at the airport after flights were cancelled because of the volcanic activity.

For international tourists, the disruption has created uncertainty about connecting flights, hotel bookings and onward travel.

Airlines are monitoring volcanic ash conditions before deciding whether flights can safely operate.

Why Volcanic Ash Is Dangerous for Aircraft

Volcanic ash is not simply ordinary dust.

It can contain tiny particles of volcanic rock and glass. When an aircraft flies through a significant concentration of ash, the particles can enter jet engines and potentially damage critical components.

Ash can also reduce visibility and affect aircraft systems.

For this reason, airlines and aviation authorities often cancel or reroute flights when volcanic ash enters important flight paths.

The cancellations caused by Anak Krakatau are therefore primarily a safety measure, rather than simply a response to airport congestion.

Residents Warned About Ash

The eruption is also affecting communities near the volcano and areas where ash has fallen.

Authorities have advised residents in affected areas to take precautions against volcanic ash exposure, including limiting outdoor activities and using masks when necessary.

Reports have also described ash reaching populated areas, including parts of Jakarta and West Java.

Some schools have moved activities online because of concerns about air quality and the effects of volcanic ash.

People experiencing breathing difficulties or irritation from ash are being encouraged to follow local health advice.

No Major Evacuation Reported

Despite the serious disruption, authorities have not reported a large-scale evacuation connected to this latest eruption.

People have been advised to stay away from the volcano and respect exclusion zones.

Authorities are continuing to monitor the volcano because further eruptions remain possible.

Reuters reported that Anak Krakatau is one of Indonesia's many active volcanoes and that the latest activity has again highlighted the country's vulnerability to volcanic hazards.

Anak Krakatau's Dangerous History

Anak Krakatau has a particularly well-known history.

The volcano emerged from the remains of the famous Krakatoa volcanic system following the catastrophic 1883 eruption.

In December 2018, an eruption and collapse of Anak Krakatau triggered a tsunami that struck coastal areas of Indonesia. More than 400 people were killed in that disaster.

Because of this history, Indonesian authorities closely monitor changes in Anak Krakatau's volcanic activity.

The current eruption has not produced a tsunami warning, but officials continue to watch the volcano and surrounding waters carefully.

Indonesia's Ring of Fire

Indonesia is one of the world's most volcanically active countries.

It lies along the Pacific Ring of Fire, a region where several tectonic plates meet and where earthquakes and volcanic eruptions are common.

Indonesia has around 130 active volcanoes, according to Reuters.

This geological setting provides fertile volcanic soil and contributes to Indonesia's natural beauty, but it also means communities must regularly prepare for volcanic hazards.

The eruption of Anak Krakatau is another reminder of the powerful geological forces beneath the region.

What Travelers Should Do

Travelers currently flying to or through Indonesia should check their airline and airport status before leaving for the airport.

Passengers whose flights have been cancelled should contact their airline or travel provider about rebooking, refunds or alternative routes.

Travelers should also avoid relying on old flight information because volcanic conditions can change quickly.

Airlines may restore flights when ash conditions improve, but additional eruptions could cause further cancellations.

Anyone traveling near affected areas should also follow instructions from Indonesian authorities and avoid restricted zones around the volcano.

What Happens Next?

The immediate focus is on monitoring Anak Krakatau, protecting residents and gradually restoring aviation operations when conditions become safe.

Authorities are continuing to assess volcanic ash in the atmosphere and its effect on airports and flight routes.

The situation remains dynamic. Even if some airports reopen, airlines may need additional time to clear backlogs and reposition aircraft and crews.

For passengers, this means delays and cancellations could continue even after airport operations begin returning to normal.

Final Update

The Anak Krakatau eruption has become a major international travel story, with hundreds of thousands of travelers affected and thousands of flights disrupted.

The latest available information on September 7 indicates that about 341,000 travelers have been affected and nearly 3,000 flights have been cancelled or delayed, while seven airports remained closed because of volcanic ash.

The situation is being monitored closely, and authorities continue to prioritize aviation safety.

For travelers, the most important advice is simple: check official airline and airport updates before traveling and follow local safety instructions.

As Indonesia continues monitoring Anak Krakatau, the world will be watching to see whether volcanic activity decreases or produces further eruptions in the coming days.

This article was prepared using the latest information available on September 7, 2026. Flight numbers, airport closures and volcanic conditions may change as authorities continue to monitor the situation.