Flight Disruptions Continue After Anak Krakatau Eruption

Ongoing disruption to air travel across Indonesia and wider Southeast Asia continued on September 7 after the powerful weekend eruption of Anak Krakatau forced airport closures, mass flight cancellations and widespread diversions as volcanic ash lingered over key air corridors.

Airports Remain Shut as Ash Drifts Over Java and Sumatra

Indonesia’s main international gateway, Soekarno Hatta International Airport serving Jakarta, and a number of other airports remained affected on September 7 following a sustained eruption of Anak Krakatau that intensified from September 4 and peaked over the weekend. Volcanic ash spread across parts of western Java and southern Sumatra, prompting authorities to keep closures and restrictions in place on safety grounds, according to publicly available information from Indonesia’s Meteorology, Climatology and Geophysics Agency (BMKG) and the Transport Ministry.

BMKG reports indicate that eight airports were ordered shut temporarily as ash clouds drifted through busy airspace in the Sunda Strait region, with updates describing a dynamic situation as winds continued to transport ash at different altitudes. Notices to Air Missions (NOTAMs) and regular volcanic ash advisories have been issued to guide airlines and air traffic controllers as they adjust routes and capacity.

Coverage from Indonesian agencies and international media describes ash columns rising several kilometers above the volcano and dispersing widely, reducing visibility and carrying abrasive particles that can damage aircraft engines and systems. While the most intense eruption pulse eased late on September 6, monitoring agencies kept Anak Krakatau at an elevated alert level and maintained aviation warnings as seismic data suggested continued activity.

Local reports also describe a coating of fine ash in parts of the Jakarta metropolitan area and coastal regions along the Sunda Strait, contributing to air quality concerns on the ground while reinforcing the caution being applied to aviation operations above.

Hundreds of Flights Canceled and Thousands of Travelers Stranded

Transport ministry bulletins and local media round ups indicate that at least several hundred flights were affected across the Indonesian network over the weekend, including both international and domestic services. One update from Indonesia’s air transport authorities on September 6 cited more than 300 flights disrupted by a combination of full airport closures and reduced operations as the ash cloud evolved.

Jakarta’s Soekarno Hatta, one of Southeast Asia’s busiest hubs, experienced a near complete halt to operations for several hours on September 6, according to airline travel advisories and eyewitness accounts, creating a significant backlog of passengers. Secondary Jakarta airport Halim Perdanakusuma and regional airports including Lampung’s Radin Inten II and others closer to the Sunda Strait were also listed among the facilities affected.

International coverage from wire services and regional broadcasters describes scenes of crowded terminals, with passengers waiting for updated departure times or being rebooked on later services once conditions allow. In some cases, travelers on through itineraries across Asia have been stranded mid journey after connections through Jakarta or other Indonesian hubs were canceled.

Aviation tracking communities monitoring the region reported large gaps in usual flight paths around western Java and diversions of long haul services to alternative routings to avoid ash forecasts, reflecting the broader knock on effect on regional traffic beyond Indonesia’s borders.

Airlines Issue Advisories, Waive Fees and Reroute Aircraft

Low cost carrier groups and full service airlines alike have begun publishing detailed advisories outlining the impact of Anak Krakatau on their operations. AirAsia’s regional newsroom guidance dated September 6 notes that all flights to and from Jakarta were canceled or rescheduled after the temporary closure of Soekarno Hatta, with the carrier offering rebooking and credit options to affected travelers.

Scoot, Singapore Airlines’ low cost subsidiary, separately listed multiple Singapore Jakarta rotations canceled on September 6 due to volcanic ash, stating that it would continue to monitor conditions and adjust schedules. Other regional airlines, including Indonesian carriers serving domestic routes across Java and Sumatra, have issued similar updates through their websites and social channels, highlighting rolling disruption as ash advisories evolve.

For many travelers, airlines are providing the option to change travel dates without additional fees or to obtain refunds where flights are canceled. Some carriers are also cautioning that even flights that remain scheduled may face extended delays or last minute rerouting depending on the latest meteorological data and air traffic control guidance.

Operationally, airlines are repositioning aircraft around the closure areas, with some long haul services to Indonesia diverting to alternative airports or holding outside affected airspace while conditions are reassessed. Schedules for the coming days are expected to remain fluid as carriers balance safety requirements with efforts to clear backlogs.

Meteorologists Track Ash Plume and Aviation Hazards

Indonesia’s BMKG has intensified 24 hour monitoring of Anak Krakatau’s activity and its atmospheric impacts, focusing on ash column height, dispersion patterns and prevailing winds. Public updates describe the coordinated use of satellite imagery, ground based observations and numerical models to estimate ash concentrations at various flight levels, information that feeds into volcanic ash advisories for aviation stakeholders.

Scientific and aviation safety literature notes that even relatively thin ash concentrations can pose significant risks to jet aircraft by sandblasting cockpit windows, clogging sensors and, most critically, melting within engines before solidifying on turbine blades. International guidance generally encourages a precautionary approach, recommending that commercial traffic avoid any airspace where ash is known or forecast.

In the current Anak Krakatau episode, BMKG and regional aviation authorities are issuing regular Significant Meteorological Information messages, or SIGMETs, that delineate affected areas and altitudes so air traffic controllers and airline operations centers can design safe reroutes. Updates indicate that ash has been observed up to cruising altitudes commonly used for medium and long haul services, complicating efforts to simply fly above the plume.

The evolving nature of the eruption also means that earlier clear corridors can quickly become contaminated with ash if eruption intensity increases or wind direction shifts, which is contributing to the cautious reopening pace for airports under the ash cloud.

What Travelers Should Expect in the Coming Days

As of September 7, publicly available notices from Indonesian agencies and airline advisories suggest that disruptions are likely to persist in the short term, particularly for flights touching Jakarta and other airports in western Indonesia. Even where airports reopen, operations may resume gradually with reduced capacity while authorities test conditions and monitor for renewed ash emissions.

Travelers with planned journeys into or through Indonesia in the coming days are being advised through airline channels and airport announcements to check their flight status frequently, allow additional time for potential delays and be prepared for itinerary changes. Flexible ticket policies currently in place at several carriers can help mitigate the impact for those able to postpone trips until conditions stabilize.

Regional tourism bodies and travel forums report heightened concern among visitors headed to destinations such as Bali, Singapore and Kuala Lumpur that often rely on connections through Jakarta. At present, most guidance indicates that the primary disruption is concentrated around western Indonesian airspace, but itineraries that include Jakarta or nearby airports remain at higher risk of change.

Monitoring agencies emphasize that Anak Krakatau has shown elevated activity since mid 2026, and observers note that previous eruptions from the same volcanic system have produced prolonged periods of aviation disruption. How long this current wave of flight disturbances will last depends largely on whether the volcano’s activity tapers off or continues to generate ash at levels that intrude into major flight corridors.