"The runway at Catania Airport is unusable due to volcanic ash fall: both arrivals and departures are suspended," the company managing the airport said in a statement.
Flights should resume at 3:00 pm (01:00 pm GMT), it said, asking travellers to check the status of their flights before heading to the airport.
Ash plumes shot up into the sky as high as 4.5 kilometres, Italy's National Institute of Geophysics and Volcanology (INGV) wrote on X, formerly Twitter, on Thursday.
Footage shared on social media Friday showed the streets of Catania's city centre covered in thick layers of black ash, slowing down traffic.
Mount Etna -- a soaring 3,324-metres high (10,905 feet) volcano -- has erupted multiple times in recent decades.
Over the last few days, its crater had started spitting out fountains of scorching lava and releasing ash that landed on Catania airport down below.
Italian authorities also issued a red warning for another volcano north of Sicily, Stromboli -- on the island of the same name -- whose eruption created ash clouds.
Mount Stromboli -- culminating at 920 metres and with a base reaching 2,000 metres below sea level -- is known for being one of the only nearly constantly active volcanoes in the world, according to the INGV.
Millions of passengers transit through Catania airport every year, connecting them to eastern Sicily, among Italy's most popular tourist hotspots.
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