The eruption occurred late on Friday night, with ash rising as high as 15,000 feet on the Sumatra side.
Airports were closed because volcanic ash can damage aircraft engines and reduce visibility.
Jakarta’s main international airport remained shut until 6 p.m. local time, with other airports reopening the next morning.
The disaster agency recommended masks and remote education to reduce health risks.
Indonesia lies on the Pacific Ring of Fire, a region with frequent volcanic and seismic activity.
The ash spread over Jakarta and surrounding regions, leading authorities to close eight airports for safety.
Approximately 170,000 travelers were impacted, and schools adopted remote learning to protect students.
Scientists warn that further eruptions are possible, and residents are advised to wear masks when outdoors.
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