Ash from Anak Krakatau strands passengers as Jakarta airport closure hits Singapore and Malaysian carriers hardest

Perspective Analysis

Mount Anak Krakatau began erupting late on 4 September 2026. By early the next day volcanic ash had reached Soekarno-Hatta International Airport outside Jakarta, prompting Indonesian transport authorities to suspend flight operations. A paper test conducted between 12:35 a.m. and 1:05 a.m. on 6 September confirmed ash presence, leading to an initial closure from 1:30 a.m. to 5:30 a.m. local time. That window was extended first to 9:30 a.m. and then further into the afternoon, with one account placing the new end at 1:30 p.m. and another at 5:30 p.m.

Liputan6 reported that 33 flights were affected in the first phase, including 16 international cancellations and seven delays on routes to Singapore, Hong Kong, Sydney, Seoul, Doha, Amsterdam and Kuala Lumpur. Domestic services to Lampung, Denpasar and Surabaya saw four cancellations and one diversion. The airport operator later stated that 209 flights had been hit by the extended suspension, while one Singapore report put the total at 301. Passengers waited in terminals as airlines issued updates; some received last-minute texts about delays, others learned of cancellations only after arriving.

Singapore Airlines cancelled 19 flights between Singapore and Jakarta on 6 September, including two that had already been retimed. Scoot cancelled 12. The lists published by The Straits Times and The Star named every flight number and scheduled time, from early-morning departures to evening services. Changi Airport posted a notice advising travellers to check with carriers. Other Indonesian airlines such as Garuda, Batik Air, Citilink and TransNusa cancelled some early flights but kept later departures on the schedule. Alternative airports at Kertajati, Ahmad Yani and Juanda were offered for possible diversions.

Ash plumes reached 6,000 metres on the Java side of the volcano and 15,000 metres on the Sumatra side and parts of Banten province, according to the meteorological agency BMKG. The disaster mitigation agency BNPB reported ashfall in Lampung and Banten, where schools cancelled outdoor activities and residents experienced eye irritation. Fishermen stayed in port. Police in Cianjur, roughly 200 kilometres away, distributed masks. BNPB said there was no imminent tsunami risk, a point repeated by Al Jazeera, ABC News and The Straits Times. The agency planned cloud-seeding operations on 6 September to encourage rain that might clear the ash.

Anak Krakatau sits in the Sunda Strait between Java and Sumatra. It emerged in the 1920s inside the caldera left by the 1883 Krakatoa eruption. The volcano has been at alert level three since July. A 2018 collapse triggered a tsunami that killed more than 400 people along nearby coasts. Current activity produced lava fountains and sounds audible up to 700 kilometres away, but authorities stressed that safety decisions at the airport prioritised engine protection and visibility over schedule recovery.

Indonesian coverage, led by Liputan6, stayed on runway status and ministry coordination. It quoted the airport branch communication manager confirming the 9:30 a.m. extension and the director general of civil aviation describing the paper test results. Passenger impact appeared as queues and requests to monitor airline notices. No specific foreign carriers were named.

Singapore and Malaysian reporting instead itemised the exact SIA and Scoot cancellations with times and flight numbers. The Straits Times listed nineteen SIA services and twelve Scoot services; The Star reproduced the same lists. Both outlets added Changi Airport guidance and noted that the situation remained fluid. The two pieces carried nearly identical text on the airline actions, indicating they drew from the same carrier statements rather than separate reporting chains.

Al Jazeera and ABC News placed the airport suspension inside the wider pattern of ash dispersal across provinces and the volcano’s history. They recorded the 6,000-metre and 15,000-metre plume heights, the 2018 tsunami precedent, and BNPB’s advice on masks and reduced outdoor activity. Neither named individual airlines or flight counts beyond the general figure of more than 200 affected services. Their accounts converged on the same Indonesian government sources for the no-tsunami statement and the public-health guidance.

All five outlets traced the core facts—ash detection, suspension extensions, and the absence of tsunami danger—to the same Indonesian transport ministry, BMKG and BNPB releases. Flight totals varied across the day without reconciliation in any single article. The single-source claim of nineteen SIA and twelve Scoot cancellations appeared only in the Singapore and Malaysian pieces that quoted the carriers directly.

Domestic outlets therefore supplied the clearest running account of how long the runway stayed closed and how many early flights were lost inside Indonesia. Neighbouring coverage quantified the precise connectivity cost to Singapore-based carriers. International reporting supplied the plume heights and the 2018 reference that placed the current episode in longer context. The shared reliance on Indonesian state agencies produced consistent statements on ash location and tsunami risk, yet left the exact scale of disruption dependent on which count a reader encountered first.