Anak Krakatau Eruption Forces Closure of Six Indonesian Airports

A significant eruption of Indonesia’s Anak Krakatau volcano has forced the temporary closure of six airports across western Indonesia, disrupting hundreds of domestic and international flights as a vast ash cloud drifts over busy air corridors linking Jakarta with the wider region.

Six Airports Suspended as Ash Cloud Spreads Over Western Indonesia

Publicly available information from Indonesia’s Transport Ministry indicates that operations have been temporarily suspended at six airports after Anak Krakatau sent a towering ash plume into the atmosphere over the Sunda Strait on the night of 5 September and into 6 September 2026. The closures include Jakarta’s Soekarno Hatta International Airport and Halim Perdanakusuma Airport, Radin Inten II Airport in Lampung, and several smaller facilities affected by drifting ash.

Air navigation notices show that aerodrome status at the affected airports was changed to closed as volcanic ash was detected within critical approach and departure paths. The suspensions were framed as precautionary measures to protect passenger safety and aircraft operations in line with international aviation guidelines on volcanic ash.

Data released through official channels on 6 September reports that hundreds of flights have been delayed, diverted, or canceled as a result of the closures, including services connecting Jakarta with other major Indonesian cities and regional hubs in Southeast Asia. Airlines have begun rerouting aircraft to unaffected airports while waiting for clearer conditions.

The closures highlight the strategic importance of the Jakarta air hub, which handles one of Asia’s busiest domestic networks. Even short suspensions at Soekarno Hatta and Halim Perdanakusuma have knock on effects across Indonesia’s archipelagic flight system, leading to cascading schedule disruptions throughout the day.

Hundreds of Flights Disrupted Across Domestic and International Routes

According to published coverage and ministry updates, more than 300 flights were affected in the first hours of the disruption as air traffic controllers imposed restrictions on arrivals and departures at the main Jakarta airports and at Radin Inten II in Lampung. Cancellations and diversions were reported on both domestic and international routes, with some long haul services diverting to alternative regional hubs.

Reports from Southeast Asian media indicate that flights bound for Jakarta from neighboring countries, including Malaysia, were among those canceled after the temporary suspension of operations at Soekarno Hatta. Passengers traveling on popular weekend routes across the region faced extended delays as airlines worked to rebook services and reposition aircraft outside the ash affected zone.

Aviation advisories show that the ash cloud from Anak Krakatau has drifted across parts of Banten, Lampung, and nearby provinces, intersecting several key airways that connect Jakarta with Sumatra and onward destinations. This has led not only to outright airport closures but also to route adjustments and altitude restrictions for flights operating in nearby airspace.

Indonesia’s state air navigation provider continues to issue updated notices to airmen as conditions evolve, with real time information used to determine when runways and surrounding airspace can safely reopen. Industry observers note that even after airports resume operations, it may take many hours for airlines to clear backlogs and restore normal schedules.

Volcanic Plume Reaches High Altitudes, Tracked by Meteorological Agency

The Meteorology, Climatology, and Geophysics Agency (BMKG) has intensified 24 hour monitoring of the Anak Krakatau eruption, publishing detailed analyses of ash dispersion patterns over western Indonesia. Satellite imagery and atmospheric modeling shared through official channels show the ash plume reaching high altitudes and spreading in several distinct clusters.

BMKG reports indicate that volcanic ash has been detected up to around 6,000 meters on the Java side of the volcano, with higher plumes rising toward 15,000 meters over the Sumatra side and over parts of Banten and Lampung. These heights place ash within commonly used cruising levels for commercial jets, which is a key factor behind the conservative stance taken on flight suspensions.

The agency’s dispersion maps show ash moving across sections of the Sunda Strait and over parts of western Java and southern Sumatra, prompting the issuance of numerous Significant Meteorological Information (SIGMET) advisories to the aviation sector. These warnings are used by pilots and dispatchers to avoid contaminated airspace and adjust routes and altitudes where necessary.

BMKG’s public updates also emphasize potential impacts on local communities, including reduced visibility and ash fall in some coastal and inland areas. Residents in affected zones have been advised through local channels to limit outdoor exposure during periods of dense ash and to follow guidance from disaster management authorities.

Anak Krakatau’s Eruption Renews Focus on Indonesia’s Volcanic Risk

Anak Krakatau, whose name means “Child of Krakatau,” emerged in the early 20th century from the caldera left by the catastrophic 1883 Krakatoa eruption. Since then it has remained one of Indonesia’s most closely watched volcanoes, with periods of heightened activity periodically affecting maritime and aviation routes through the busy Sunda Strait.

The current episode follows several months of increased seismic and eruptive activity around the volcano as documented by the country’s volcanology agency and research institutions. The weekend eruption produced dramatic lava fountains and a substantial ash column that has drawn global attention, recalling earlier events in 2018 when a flank collapse at Anak Krakatau generated a deadly tsunami along nearby coastlines.

Indonesia sits on the seismically active Pacific Ring of Fire and hosts more than 100 active volcanoes. This geography means that aviation planners and meteorological services must routinely factor volcanic risk into air traffic management, particularly on dense domestic routes radiating from Jakarta and other major cities.

Aviation analysts note that the rapid issuance of advisories and airport closures around Anak Krakatau illustrates how lessons learned from previous eruptions in Indonesia and abroad are shaping current risk management. The priority remains to prevent aircraft from encountering ash clouds that can damage engines, sensors, and windscreens, and potentially compromise flight safety.

Outlook for Travelers as Authorities Assess Conditions

As of Sunday afternoon local time, publicly available information indicates that authorities and service providers are reviewing ash concentrations on an ongoing basis to determine when it is safe to reopen each of the six affected airports. Some closures have already been extended through updated notices as monitoring shows lingering ash near flight paths.

Airlines operating in and out of Indonesia are advising passengers to check the status of their flights before traveling to the airport and to expect possible last minute schedule changes while Anak Krakatau’s activity remains elevated. Many carriers have introduced flexible rebooking policies for journeys to and from Jakarta and other affected destinations during the disruption period.

Travel industry observers suggest that once airspace assessments show reduced ash density, airports are likely to reopen in stages, prioritizing key domestic and international connections. Even then, residual delays are expected as aircraft and crews return to normal rotations and as ground operations clear accumulated backlogs at terminals.

For travelers planning near term visits to Indonesia, the situation around Anak Krakatau is a reminder of the country’s dynamic natural environment and the importance of monitoring airline and airport advisories. While disruptions are currently concentrated in western Indonesia, the evolving ash cloud is being tracked closely to anticipate any broader impact on regional air traffic corridors.

Associated Press coverage of Anak Krakatau eruption and Jakarta flight suspensions

BMKG press release on Anak Krakatau ash dispersion and aviation impact

ANTARA English report on suspension of six Indonesian airports

Indonesian Transport Ministry aviation notice on Anak Krakatau related closures