Ngurah Rai airport was due to be closed from 3am to at least 7pm Friday after a pilot report detected volcanic ash as high as 23,000 feet following Mount Agung's eruption on Thursday. Several flights were cancelled or rescheduled on Thursday.
The early morning closure of Ngurah Rai airport resulted in the cancellation of 446 flights, including more than 200 worldwide arrivals and departures, with as many as 15,700 passengers affected, according to news reports.
The National Disaster Mitigation Agency has also informed that almost 450 flights were cancelled.
Ash is unsafe for planes because it makes runways slippery and can be sucked into their engines.
Bali's main worldwide gateway will be closed until at least Friday evening, according to officials, who added that two other domestic airports were also shut.
Mt Agung caused widespread disruptions towards the end of 2017, throwing the travel plans of thousands of holidaymakers into chaos.
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Air New Zealand said flight NZ245 from Auckland to Denpasar and the return flight NZ246 from Denpasar to Auckland have been cancelled today.
Clouds of ash from the Mount Agung volcano are lit with warm sunset light in Karangasem, Bali previous year.
Long lines at airport in Bali as flights are cancelled or delayed. Authorities lowered its alert status from the highest level in February. An officer having the knowledge of the matter said that the alert levels have not been raised and an exclusion zone around the crater remains 4 kilometres.
The volcano, about 70km northeast of Bali's tourist hotspot of Kuta, last had a major eruption in 1963, killing about 1100 people. Last year, a series of eruptions from September to December prompted evacuations and flight disruptions, but no loss of life was reported.
Indonesia sits on the so-called Pacific Ring of Fire, an area known for seismic upheavals and volcanic eruptions.