Millions of people have been affected by flight cancellations in Europe and across the world [AFP]

List of countries across Europe with flight disruptions due to the volcanic ash cloud as of 15:30 GMT on Wednesday:

Austria - Austria reopened its airspace on Monday but some flights remain cancelled.

Belgium - Flight restrictions were partially lifted from 06:00 GMT on Tuesday.

Bosnia - Airports open.

Bulgaria - All airspace and airports open.

Czech Republic - Air space reopened on Monday.

Croatia - Airspace and all airports open.

Denmark - All airspace open since 9:00 GMT Wednesday.

Estonia - Airspace reopened at 20:00 GMT on Tuesday.

Finland - Helsinki airport closed again at 12:00 GMT on Wednesday after being opened briefly.

France - All long-haul flights to and from France and three quarters of shorter services were operating as scheduled on Wednesday.

Germany - Airspace fully reopened from 9:00 GMT.

Hungary - Airspace fully open since Tuesday.

Iceland - Air space open but many flights to Europe cancelled.

Ireland - Airspace reopened.

Italy - Airspace reopened.

Latvia - Airspace reopened at 06:00 GMT on Tuesday.

Lithuania - Airspace is open.

Luxembourg - Luxembourg Airport reopened at 08:00 GMT on Tuesday.

Moldova - International flights resumed.

Montenegro - Airports open.

Netherlands - Passenger flights began on Monday. Night flights resumed on Tuesday.

Norway -  Airspace open.

Poland - Airspace open since Wednesday morning.

Romania - Airspace reopened on Monday at 18:00 GMT with all airports operating.

Russia - All airports open. Aeroflot flying to the United States via the North Pole.

Serbia - Airports open.

Slovakia - Airspace open.

Slovenia - Airspace reopened at 10:00 GMT on Tuesday.

Spain - Reopened all airports on Sunday.

Sweden - All restrictions lifted on Wednesday.

Switzerland - Reopened airspace on Tuesday.

Turkey - All airports open. Planes flying out of the Black Sea cities of Samsun, Sinop and Zonguldak have been advised not to fly higher than 6,000 metres.

Ukraine - Kiev's Borispol international airport open.

United Kingdom - All UK airspace reopened at 21:00 GMT on Tuesday but airspace over the Scottish isles of Orkney and Shetland have been temporarily reclosed.

Source: Agencies