More news on this day
Volcanic ash from Mount Sinabung in North Sumatra has disrupted air travel between Jakarta and Medan, with 15 flights on the Soekarno-Hatta–Kualanamu route canceled on Tuesday, September 1, 2026, according to multiple Indonesian media reports.
Get the latest news straight to your inbox!
Flight Disruptions on a Key Domestic Route
Publicly available information shows that operations on the Soekarno-Hatta International Airport to Kualanamu International Airport route were significantly affected after Mount Sinabung’s latest eruption beginning Monday, August 31, 2026. The cancellation of 15 flights, combined with additional delays, disrupted one of Indonesia’s busiest domestic air corridors linking the capital region with North Sumatra.
Data cited in local coverage indicates that on Tuesday, September 1, there were 41 scheduled flight movements on the Soekarno-Hatta–Kualanamu sector, comprising 20 arrivals and 21 departures, with an estimated 5,350 passengers. Out of these, 15 flights in both directions were canceled as a direct response to conditions related to volcanic ash around Kualanamu’s airspace.
Reports also highlight that around 14 further flights on the same route experienced delays as airlines and airport operators adjusted schedules in line with prevailing safety assessments. The cancellations and late departures produced knock-on effects for connecting journeys, particularly for passengers traveling onward to other destinations in Sumatra and eastern Indonesia.
Coverage from several Indonesian outlets notes that operators framed the cancellations as a force majeure response to volcanic activity, emphasizing adherence to aviation safety standards where volcanic ash may pose risks to aircraft engines and visibility.
Kualanamu Operations Temporarily Curtailed
Mount Sinabung, located in Karo Regency in North Sumatra, lies roughly 100 kilometers from Kualanamu International Airport. According to domestic and international reports, ash from the eruption spread across parts of North Sumatra’s airspace, prompting temporary adjustments to flight operations at Kualanamu.
Information from Kualanamu’s operator, as cited in national news coverage, indicates that at least 21 flights to and from the airport were canceled across domestic and international routes as a result of the eruption. In parallel, Soekarno-Hatta-bound services were among those most visibly affected at the national level, reflecting the high traffic volume between the two airports.
Published reports describe how the temporary curtailment of operations at Kualanamu led airlines to consider a mix of responses, including cancellations, delays, schedule changes, and possible rerouting of some services. Several carriers serving the Medan area, including members of major Indonesian airline groups, issued advisories outlining adjustments for flights from and to Kualanamu in the wake of Sinabung’s increased activity.
Regional reports also note that other airports in northern Sumatra and nearby provinces experienced some level of disruption, with at least a small number of flights in Aceh reported delayed due to ash-related concerns along affected flight paths.
Airlines and Airports Emphasize Safety and Coordination
Public statements cited in Indonesian media describe a coordinated response involving airport operators, airlines, and air navigation authorities. At Soekarno-Hatta, operator InJourney Airports reported enhanced monitoring of volcanic ash advisories and close coordination with carriers operating the affected routes.
According to multiple news outlets, the cancellations and delays on the Soekarno-Hatta–Kualanamu corridor were driven by a precautionary approach that prioritized flight safety. Volcanic ash can damage jet engines, abrade cockpit windows, and reduce visibility, making conservative decision-making a standard part of international best practice in volcanic events.
Industry notices referenced in coverage from airline groups serving Kualanamu indicate that carriers evaluated each scheduled flight based on evolving ash dispersion data and official aviation advisories. In several cases, flights were preemptively canceled to avoid in-route diversions or last-minute disruptions that could result in extended tarmac times and passenger crowding at terminals.
Airport operators publicly urged passengers booked on affected services to remain in close contact with their airlines, check flight status before heading to the airport, and make use of digital channels for rebooking options. Media reports describe ongoing efforts at both Soekarno-Hatta and Kualanamu to manage waiting passengers and provide updated information throughout the day.
Travelers Face Rebooking and Itinerary Changes
For travelers, the immediate impact of the Sinabung eruption has been felt in the form of cancellations, delayed connections, and last-minute itinerary changes. With 15 flights canceled and an additional 14 delayed on the Soekarno-Hatta–Kualanamu route alone, thousands of passengers experienced some level of disruption to their plans.
Reports from Indonesian newsrooms note that airline customer-service teams have been processing rebookings and offering alternative travel dates where seats are available. Some carriers have also used larger aircraft on subsequent rotations to accommodate stranded travelers once conditions allowed more regular operations.
The disruption has been particularly challenging for passengers traveling during the busy midweek period for business, family visits, and onward international connections via Jakarta. Travel advisers commonly recommend that passengers affected by volcanic events maintain flexible itineraries, monitor their airline’s official communication channels, and allow additional time for airport procedures in case of continuing schedule changes.
For visitors planning near-term travel to or through North Sumatra, current coverage suggests that it is advisable to watch for updated advisories on Mount Sinabung’s activity level and to verify flight status close to departure. While many routes in Indonesia remain unaffected, the situation around Kualanamu and its main domestic links continues to be shaped by the volcano’s evolving behavior.
ANTARA News Banten coverage of Soekarno-Hatta to Kualanamu disruptions
MetroTV News report on 15 canceled Soekarno-Hatta–Kualanamu flights
ANTARA English report on flight cancellations at Kualanamu Airport
Jakarta Post article on Sinabung eruption and aviation impact