Sinabung Ash Reaches Kualanamu, Grounding Dozens of Flights
A fresh eruption of Mount Sinabung in North Sumatra on Monday, August 31, sent volcanic ash drifting toward Medan's Kualanamu International Airport, forcing airport authorities and airlines to make rapid operational adjustments. By Tuesday, September 2, at least 21 flights on both domestic and international routes had been canceled, with additional services facing delays and schedule changes.
Antara News, which first reported the details, cited acting Director of Operations and Services Dedy Sri Cahyono of PT Angkasa Pura Aviasi, the airport's operator, as confirming the cancellation figure. Dedy noted that the total number of affected flights remained fluid, tied directly to how far the ash cloud spread and to individual airlines' own safety assessments.
Temporary Closure and the NOTAM
AirNav Indonesia issued Notice to Airmen A3250/26, formally announcing a precautionary closure of Kualanamu. The airport was shut from 10:50 a.m. to 12:45 p.m. on Tuesday to protect aircraft and passengers from ash ingestion risks. PT Angkasa Pura Aviasi said it was coordinating closely with all relevant stakeholders and monitoring conditions continuously to determine what further measures might be needed.
Passengers were urged to check flight status directly through their airlines' official channels, as the situation remained dynamic throughout the day.
What Travelers Should Know
Volcanic disruptions of this kind can escalate or resolve quickly depending on wind direction and eruption intensity. A few practical points for anyone traveling through Kualanamu during an active Sinabung event:
- Check before you go. Airlines update flight status faster than third-party aggregators during volcanic events. Go directly to your carrier's app or website.
- Build in buffer time. Even flights that are not canceled may face significant delays while ash dispersal is assessed.
- Watch official alerts. Indonesia's Geological Agency had already warned of the potential for a larger eruption, so conditions could change beyond what a single NOTAM covers.
- Accommodation flexibility matters. If you are staying in or around Medan, confirm your property's cancellation policy in advance; volcanic disruptions are generally treated as force majeure.
Why It Matters for Hosts
Independent accommodation operators in the Medan area and the Karo Highlands near Sinabung should treat volcanic activity as a recurring operational reality, not a one-off event. Keeping a clear, up-to-date cancellation and rebooking policy that explicitly addresses natural disasters will reduce friction with guests who arrive late, need to extend their stay, or cannot arrive at all. Proactively communicating road and airport status to incoming guests via messaging apps as soon as a NOTAM or eruption alert is issued builds trust and reduces last-minute confusion. It is also worth maintaining a short list of local transport contacts who can advise on ash-affected road conditions between Kualanamu and highland destinations.
Details in this post were first reported by Antara News on September 2, 2026.
First reported by en.antaranews.com.