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A sustained eruption at Indonesia’s Anak Krakatau volcano has disrupted one of Southeast Asia’s busiest air corridors, with drifting ash clouds prompting airport closures, hundreds of flight cancelations and widespread delays across western Indonesia.
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Airports Closed as Ash Drifts Over Jakarta and Lampung
Volcanic ash from Anak Krakatau’s early September eruption has swept across the Sunda Strait and into heavily trafficked airspace serving Jakarta and parts of Sumatra and Java. Publicly available information shows that temporary closures at Soekarno Hatta International Airport, Jakarta’s main hub, began on 6 September 2026 after ash was detected in the vicinity of the runways and approach paths.
Notices to airmen indicated that Soekarno Hatta suspended operations for several hours on Sunday afternoon to reduce the risk to aircraft engines and onboard systems. Indonesia’s transport authorities subsequently extended and expanded airport restrictions into Monday, as ash continued to drift at cruising altitudes used by commercial jets.
Radin Inten II International Airport in Lampung, which sits closer to the Sunda Strait, has seen multiple cancelations and diversions on routes linking Lampung and Jakarta. Local media reports indicate that ash along the Lampung–Jakarta flight path forced airlines to ground or reroute several services as the cloud evolved.
Additional airports in Banten, Jakarta, West Java and Lampung provinces, including Halim Perdanakusuma and Husein Sastranegara, have also faced temporary closures or limited operations. National aviation bulletins point to a network-wide effort to keep aircraft away from the most concentrated ash columns while maintaining limited connectivity where conditions allow.
Hundreds of Flights Affected and Schedules Rebuilt
Initial tallies from regional news agencies suggest that more than 200 flights were disrupted in the first 24 hours of the eruption’s impact on airspace, including cancelations, delays and diversions at Jakarta’s main airport alone. Passenger numbers affected run into the tens of thousands as carriers worked to rebook travelers on later services or alternative routes.
Low cost and full service airlines alike have issued travel advisories, with some carriers outlining flexible rebooking and refund options for tickets to and from Jakarta and nearby airports over the coming days. One major regional airline reported that ash forecasts around the Sunda Strait have obliged it to adjust flight levels, reroute over southern Sumatra or Java, or temporarily suspend certain services when safe corridors could not be guaranteed.
Aviation analysts note that disruption at a hub of Jakarta’s size tends to cascade across wider networks. Aircraft and crews that cannot depart Jakarta or Lampung on schedule often miss subsequent rotations elsewhere in Asia and Australia, creating knock-on delays and slot constraints far beyond Indonesia’s borders.
Ground operations have also been affected. Images and eyewitness accounts from Soekarno Hatta on 6 September describe quiet terminals, parked aircraft and departure boards dominated by cancelation notices while airspace restrictions were in force. As airports reopen in stages, operators face the challenge of processing backlogs of stranded passengers while continuing to monitor ash movements in real time.
Ongoing Eruption Keeps Alert Level High
The latest activity at Anak Krakatau follows a period of elevated unrest at the volcano during 2026. Indonesia’s Center for Volcanology and Geological Hazard Mitigation has maintained the alert level at Siaga, or Level III on the country’s four tier scale, indicating a significant level of volcanic activity and a clear exclusion zone around the crater.
Monitoring summaries released since 5 September describe a 25 hour episode of near continuous eruption, with lava fountains and dense ash plumes rising several kilometers above the summit. Seismic and visual observations reported by Indonesia’s geology and energy ministries indicate that, while the most intense phase eased on 6 September, Anak Krakatau remains restless and capable of renewed explosive bursts.
Officials have reiterated guidance that all activities are prohibited within a 3 kilometer radius of the volcano. Communities along the coasts of Lampung and Banten have been advised to remain alert to potential ash fall and local hazards, although current reports emphasize atmospheric impacts and aviation risk rather than large scale ground evacuations.
Specialists point out that Anak Krakatau’s location in the Sunda Strait places it directly beneath air routes linking Jakarta with Sumatra, Singapore, Kuala Lumpur and Australia. Even moderate eruptions can therefore have disproportionate consequences for regional aviation whenever ash reaches typical cruising altitudes.
Why Volcanic Ash Is So Dangerous for Aircraft
Volcanic ash presents a distinct type of hazard for aviation compared with ordinary dust or weather systems. The fine particles are composed largely of pulverized rock and glass, which can melt inside jet engines, fuse onto turbine blades and disrupt airflow. In severe encounters documented in past incidents, multiple engines have flamed out after prolonged exposure to ash clouds, forcing emergency descents and, in some cases, temporary gliding.
Ash can also abrade windscreens and leading edges, clog sensors and pit exterior surfaces, while the accompanying gas plume may interfere with avionics. Because ash clouds often resemble ordinary meteorological clouds on cockpit radar, pilots rely heavily on satellite observations, volcanic ash advisory centers and air traffic control guidance to steer clear of affected areas.
In response to Anak Krakatau’s current episode, Indonesia’s meteorological agency has stepped up round the clock monitoring of ash dispersion patterns, coordinating with the Darwin Volcanic Ash Advisory Centre in Australia. Public bulletins describe a rapidly shifting ash cloud influenced by changing wind directions at different flight levels, a factor that complicates forecasting safe corridors for airline dispatchers.
Recent scientific work on the 2018 Anak Krakatau eruption and other regional events underscores how far and fast ash can spread, particularly when powerful columns penetrate the upper troposphere. Modeling studies cited by Indonesia’s meteorological journal show that ash can drift hundreds of kilometers from the vent while still posing risks to aircraft engines and cabin systems.
What Travelers Can Expect in the Coming Days
As of early 8 September, publicly available information suggests that Anak Krakatau’s most intense eruptive phase has paused, but ash advisories and airport notices remain in effect across parts of western Indonesia. Authorities have signaled that airspace restrictions will only be lifted gradually, and in close alignment with updated ash dispersion maps and satellite imagery.
Travelers with itineraries involving Jakarta, Lampung, Bandung or nearby regional airports are being urged by airlines and travel advisories to verify their flight status before heading to the airport. Many carriers are waiving change fees or providing credits for trips scheduled during the main disruption window from 5 to 9 September, though exact policies differ by airline.
Industry observers expect that even after airports fully reopen, some delays and schedule adjustments may persist as operators reposition aircraft and crews. Slot availability, terminal congestion and ongoing weather patterns could continue to influence departure and arrival times throughout the week.
Travel risk consultancies recommend that passengers build additional buffer time into regional itineraries, particularly for tight connections in Jakarta or onward long haul departures. They also highlight the importance of monitoring official aviation notices and meteorological updates, since renewed bursts of activity at Anak Krakatau could once again alter ash trajectories and trigger short notice airspace restrictions.
Kementerian Perhubungan RI: Penutupan Delapan Bandara Imbas Erupsi Anak Krakatau
BMKG: Pemantauan Dampak Erupsi Gunung Anak Krakatau
ESDM / PVMBG: Aktivitas Anak Krakatau dan Status Siaga
Antara News: Anak Krakatau Ash Disrupts Lampung Jakarta Flights