Seven airports shut, 270,000 passengers stranded
Volcanic ash from Anak Krakatau has forced the closure of seven Indonesian airports, including Jakarta's two main gateways, leaving more than 270,000 passengers stranded or scrambling to rebook since 5 September 2026. Soekarno-Hatta International Airport (CGK) and Halim Perdanakusuma Airport (HLP) were both closed until at least 18:00 local time on Monday, 7 September, with no firm reopening guarantee beyond that point.
The eruption in the Sunda Strait, between Java and Sumatra, eased after roughly 25 hours on Sunday, but intermittent activity continued into Monday. Indonesia's Geological Agency cautioned that further eruptions remain likely. Also closed as of Monday were Radin Inten II in Lampung, Budiarto in Banten, Pondok Cabe in South Tangerang, Muhammad Taufiq Kiemas in Lampung, and Husein Sastranegara in West Java. Atung Bungsu Airport in South Sumatra had already resumed operations by 09:00 Monday.
Why volcanic ash grounds aircraft
Volcanic ash is not simply dust. It consists of tiny, jagged fragments of pulverised rock, minerals, and volcanic glass, each typically smaller than 2mm. At jet speeds, those particles abrade windscreens and wing leading edges. The more serious threat, however, is what happens inside a jet engine: ash can melt in the combustion section, then solidify on cooler turbine components, potentially causing compressor surges or power loss. Ash can also block cooling passages and interfere with sensors that measure airspeed and altitude.
Indonesia's meteorological agency was detecting ash at approximately 15,000ft and 50,000ft on Monday morning, placing part of the plume squarely within commercial cruising altitudes. Transport Minister Dudy Purwagandhi, as reported by Aerospace Global News, noted that winds at different atmospheric levels were carrying ash in multiple directions, making contamination difficult to contain. "We cannot ascertain when this will end due to the dynamic weather," he said.
Six alternative airports are handling diverted traffic
Indonesia's Transport Ministry has designated six airports as alternatives while Jakarta and the other affected hubs remain closed: Juanda in Surabaya, Adi Soemarmo in Solo, Yogyakarta International, Adisutjipto in Yogyakarta, Jenderal Ahmad Yani in Semarang, and Kertajati in West Java. Airlines are being encouraged to operate from these airports where possible to prevent passengers from crowding at closed facilities.
Even once airports reopen, a return to normal schedules will take time. Ground crews must inspect and, where necessary, clean runways, taxiways, and aprons before aircraft can move safely. Ash deposited on the ground can be ingested by engines during taxiing and takeoff, creating a secondary hazard. Aircraft and crews will also need repositioning after days of disruption.
What travelers should do right now
Passengers with bookings through Jakarta or any of the other affected airports should confirm their flight status directly with their airline before heading to any terminal. The Transport Ministry has specifically asked travelers to check conditions in advance, since the situation can shift quickly as wind patterns change. Anyone with connecting flights should verify each leg of the journey separately. Cancellations and substantial delays typically entitle passengers to rebooking, refunds, or rerouting options through one of the alternative airports.
Schedule instability may persist well after Anak Krakatau quiets, because ash can remain suspended in the atmosphere and drift back over airports if wind direction shifts.
Why it matters for hosts
Independent accommodation and experience operators near Jakarta, or in cities hosting the alternative airports such as Surabaya, Solo, Semarang, and Yogyakarta, should expect sudden swings in demand. Properties near alternative airports may see a short-term surge of stranded or rerouted travelers, while Jakarta-area operators could face a wave of last-minute cancellations. Keeping cancellation policies clearly communicated and maintaining direct contact with incoming guests will reduce friction on both sides. Operators in Yogyakarta and Surabaya in particular may want to flag availability to travelers actively seeking accommodation near diversion airports.
Details in this post were first reported by Aerospace Global News on 7 September 2026. This post is published by the Qontaktly travel blog.
First reported by aerospaceglobalnews.com.