Some airports in Spain and the Canary Islands have closed this morning due to the cloud of volcanic ash from Iceland.
Flights to and from Tenerife, La Gomera and La Palma were halted at 3am, the Spanish national airport authority Aena said.
Seville, Jerez and Badajoz closed an hour later.
Airlines are also warning of delays and cancellations for those travelling to Alicante, Madrid and Faro, Portugal.
The agency said Spain still has restrictions on aircraft flying between 20,000 feet and 35,000 feet above the ground, mainly affecting trans-Atlantic flights to and from other European countries.
“We do not know when they could reopen,” an Aena spokesperson said.
Up to 20 Spanish airports, including international hub Barcelona, closed over the weekend because of the ash.
There are no current restrictions on UK airspace.