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Indonesia’s Anak Krakatau eruption has triggered widespread flight disruptions across the archipelago, forcing hundreds of thousands of travellers into marathon overland journeys as rail tickets sell out and airfares on remaining routes soar.
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Volcanic ash shuts airports and strands passengers
Mount Anak Krakatau’s latest eruption over the Sunda Strait has pushed ash clouds across busy air corridors in western Indonesia, disrupting domestic and international services at some of the country’s most important gateways. Publicly available information shows that at least eight airports initially halted operations in response to the ash, including Jakarta’s Soekarno-Hatta International Airport, Indonesia’s main international hub.
According to reports citing Indonesia’s Transport Ministry, flight suspensions and diversions since Sunday, 6 September, have led to the cancellation, delay or rerouting of roughly 2,300 flights and affected more than 270,000 passengers in under 48 hours. Separate wire coverage indicates that ash from the ongoing eruption also forced a full shutdown of Soekarno-Hatta for extended periods, leaving aircraft and crews parked on the tarmac as airlines scrambled to rework schedules.
Regional media coverage notes that around 170 aircraft remain unable to leave Soekarno-Hatta while ash contamination risks are assessed, limiting the ability of carriers to add capacity from alternative airports. With planes and crew out of position, network disruption has rippled far beyond Jakarta, affecting routes across Java, Bali and Sumatra and complicating onward international connections.
Airlines have generally allowed rebooking, but tight capacity on alternative routes and limited clarity on reopening times have left many travellers with little choice but to abandon their flight plans entirely and search for land and sea options.
Marathon overland journeys replace short flights
The most visible effect has been an abrupt shift from air to land and sea travel. One widely reported case involves a Bali to Jakarta commuter who saw a planned two-hour flight transform into an estimated 27-hour odyssey involving multiple trains, a ferry crossing between Bali and East Java, and additional local transport across Java to reach the capital. Similar accounts describe travellers piecing together convoluted itineraries across several provinces as airport closures persisted.
Publicly available reports highlight that demand for ferries on the Bali–Java crossing has risen as passengers attempt to reach rail hubs such as Banyuwangi, Surabaya and Yogyakarta. From there, travellers connect to already busy intercity trains bound for Jakarta and other urban centres. These trips can stretch to 17 hours or more on the rails, even before factoring in transfers and delays.
The extended journeys underscore how vulnerable Indonesia’s domestic connectivity is to sudden aviation shutdowns. While Java and parts of Sumatra and Bali are linked by highways and railways, many travellers planned their trips assuming fast, frequent flights. The sudden need to change modes mid-journey, often with limited real-time information, has turned routine returns from holidays or business trips into complex, multi-leg crossings of the archipelago.
Travellers heading overseas from Indonesia have also been caught out. Coverage of the disruption describes foreign visitors and regional business travellers rerouting through secondary airports in Central and East Java, then flying on to Singapore or Kuala Lumpur for onward connections, adding days and significant expense to their itineraries.
Train demand surges as railways become a vital lifeline
Indonesia’s state-owned railway operator PT Kereta Api Indonesia (KAI) has emerged as a critical fallback for stranded passengers. Local media, drawing on KAI’s own data, report that its Surabaya operational region recorded 6,707 passengers travelling to Jakarta on Sunday, 7 September, up 88 percent from 3,562 passengers a week earlier. The figure was also about 44 percent higher than the previous day, illustrating how quickly travellers are switching from air to rail.
KAI representatives quoted in Indonesian-language coverage say trains are increasingly being used as an alternative as volcanic ash disrupts flight schedules. Rail services linking East Java, Central Java and West Java to the capital were already popular, and recent company statistics show that foreign visitor rail use reached record levels in July 2026, reflecting a growing role for trains in Indonesia’s tourism mix.
The sudden spike in demand is now testing that system. Many long-distance services to and from Jakarta have sold out in advance, prompting some travellers to assemble journeys via multiple train segments and overnight connections. Rail operators are reported to be monitoring demand and considering capacity adjustments, such as adding extra carriages or supplementary services where track slots and rolling stock allow.
However, rail capacity cannot fully absorb the volume of passengers that would normally fly through Soekarno-Hatta and other affected airports. Travellers without advance bookings are facing waitlists, circuitous routings and the prospect of spending much of their disrupted trips in station waiting areas along Java’s mainline corridors.
Airfares spike at alternative gateways
For those still determined to fly, the combination of constrained capacity and intense last-minute demand has driven sharp fare increases. Channel-based price checks highlighted in regional coverage show that flights from Singapore to secondary Indonesian gateways, such as Surabaya and Semarang, have climbed to more than double their usual levels for departures in the coming days.
One example cited in published reports is a Singapore to Surabaya flight priced at over 10 million rupiah for departures on 8 September, compared with typical fares closer to half that amount on the same route. Budget carriers serving smaller airports in Java and Sumatra have also seen rapid price movements, with one Singapore–Semarang ticket reportedly jumping from 4.3 million to 6.6 million rupiah within about an hour as seats were snapped up.
These spikes mirror a broader pattern of rising airfares documented across global markets in 2026 but are amplified by the abrupt loss of capacity around Jakarta. With many aircraft grounded at Soekarno-Hatta and crew rotations disrupted, airlines have limited scope to deploy extra flights to alternative airports, even when there is strong demand.
Travel industry analyses published earlier this year note that lingering capacity constraints, higher operating costs and complex airspace restrictions have already pushed fares higher on many international routes. Against that backdrop, sudden events such as volcanic eruptions can tip individual city pairs into extreme price territory, especially when travellers have few substitutes and limited time to rebook.
Impact on tourism and travel planning
The Anak Krakatau disruption comes at a time when Indonesia is working to spread tourism more evenly beyond its busiest hubs. Recent hospitality and aviation initiatives, including campaigns to encourage visitors to explore multiple destinations by combining air and rail, aim to showcase secondary cities and lesser-known regions.
The current crisis may inadvertently accelerate some of those trends by funnelling travellers through places such as Surabaya, Yogyakarta and Semarang instead of Jakarta and Bali’s main international terminals. However, the chaotic nature of the shift, marked by last-minute cancellations and long queues at ticket counters, risks denting visitor confidence in Indonesia’s transport reliability.
For would-be visitors and domestic travellers, the situation highlights the value of flexible planning in a country with more than 130 active volcanoes. Travel advisories and aviation experts regularly recommend that passengers build in buffer time, consider flexible tickets and understand alternative overland routes, especially during periods of increased volcanic activity.
As Anak Krakatau continues to be monitored, publicly available information indicates that airport closures and schedule changes remain possible with limited notice. Travellers with imminent trips to or within Indonesia are being urged in official notices and travel advisories to check directly with airlines, rail operators and ferry companies for the latest updates, and to be prepared for journeys that may take far longer than originally planned.
Channel NewsAsia: Indonesia flight disruptions send travellers on marathon journeys
Channel NewsAsia: Several Indonesian airports remain shut due to volcanic ash from Anak Krakatau
PT Kereta Api Indonesia: Foreign tourist rail travel hits record high in July 2026