These are the countries who closed their airspaces due to volcano eruption in Iceland
Source:BBC
Belgium
Belgium
Czech Republic
Denmark
Estonia
Finland
Hungary (from 1700 GMT)
Latvia
Lithuania
Netherlands
Slovakia
Switzerland (from 2200 GMT)
Partial closures:
Austria (closures from 1600 GMT)
France (northern airspace)
Germany (most airports closed)
Norway (limited flights in north)
Poland (most airports closed)
Republic of Ireland (most airspace opened Friday)
Sweden (northern airspace opened Friday)
UK (near-total closure)