Soekarno-Hatta Airport Suspends Flights After Eruption

Jakarta Airport Operations Halted by Volcanic Ash

Soekarno-Hatta International Airport (CGK) suspended all flight operations on Sunday, September 6, 2026, following a significant eruption of Mount Anak Krakatau. The Soekarno-Hatta Airport flight suspension was initiated to protect aircraft engines and systems from the ingestion of volcanic ash, which poses a severe threat to flight safety. The Anak Krakatau volcanic ash event triggered immediate regulatory action, resulting in the Jakarta airport closure that disrupted both domestic and international travel corridors throughout the region.

Operational Impact and Regulatory Response

The closure, mandated through NOTAM (Notice to Airmen) A3341/26 and A3344/26 issued by AirNav Indonesia, caused extensive operational gridlock. According to the DGCA (Directorate General of Civil Aviation) of Indonesia, the suspension affected 209 flight movements and approximately 22,798 passengers. At the time the airspace was restricted, 170 aircraft were parked overnight at the facility. The closure was initially set from 1:30 a.m. to 5:30 a.m. local time but was extended multiple times, ultimately lasting until 1:30 p.m. as ash plumes reached altitudes of 50,000 feet.

Ash Dispersion and Safety Protocols

The BMKG (Badan Meteorologi, Klimatologi, dan Geofisika) monitored the eruption, which occurred for 30 seconds at 3:53 a.m. local time. Volcanic ash plumes were tracked drifting in multiple directions, with lower-level ash reaching 20,000 feet moving northeast and high-altitude debris drifting west and northwest. ASHTAM (Ash Notice to Airmen) VAWR3739 provided real-time data to authorities, ensuring that the ash cloud remained clear of other critical infrastructure, such as Halim Perdanakusuma and Pondok Cabe airports. Lukman F. Laisa, Director General of Civil Aviation at Indonesia's Ministry of Transportation, stated that safety remains the top priority and that operational adjustments are being made dynamically based on evolving conditions.

Historical Context and Industry Trends

Indonesian aviation infrastructure frequently faces challenges from the Pacific Ring of Fire's volcanic activity. The current event follows a pattern seen in the April 2024 eruption of Mount Ruang, which forced the multi-day closure of Sam Ratulangi International Airport. Furthermore, the 2018 eruption of Mount Anak Krakatau serves as a historical precedent, where similar volcanic activity necessitated the mass rerouting of commercial traffic away from the Sunda Strait. These recurring events highlight the vulnerability of Southeast Asian carriers to rapid, large-scale schedule adjustments and the necessity for robust, real-time airspace management strategies.

Managing the Resumption of Services

As the ash cloud dissipates, the DGCA and AirNav Indonesia are coordinating the safe resumption of flight schedules. The transition back to normal operations is expected to be a phased process, with authorities conducting safety inspections of runways and taxiways to ensure no residual ash deposits remain. Airlines are working to rebook passengers affected by the cancellations, though the backlog of 209 flights is expected to cause cascading delays throughout the remainder of the day.

Why This Matters for Regional Connectivity

The suspension at CGK underscores the fragility of high-density aviation hubs when confronted with geological hazards. For airlines operating in the region, such as Singapore Airlines, the event highlights the operational risks inherent in the Sunda Strait transit corridor. The rapid issuance of NOTAMs and the effective coordination between the BMKG and regulatory bodies are critical to maintaining safety, yet the massive passenger impact demonstrates the significant economic and logistical challenges that volcanic events impose on the global aviation network.