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The ban on flights in English airspace has been extended into Tuesday.A spokesman for traffic control body Nats said the cloud of volcanic ash is now covering all of the UK.
Planes will remain grounded across England until at least 0100 BST on Tuesday, with further announcements expected later.
The flight ban has left hundreds of thousands of passengers stranded across Europe since the Icelandic volcano erupted on Thursday.
Emergency meeting
Some schools in England have been forced to close because pupils and staff are stranded abroad.
Ministers have attended a meeting of the government's emergency Cobra committee at Downing Street to discuss the ash crisis.
Ahead of the meeting on Monday, Cabinet Office Minister Tessa Jowell denied that the government had been too slow in its reaction.
Ms Jowell said consular staff were on hand at airports to assist stranded passengers unable to return to England.
Lord Adonis has said the government is considering using Spain as a hub to repatriate stranded citizens, with the help of the Royal Navy.
British Airways has sent up a test flight from Heathrow Airport to see if commercial plane journeys could resume.
The Boeing 747, which had the airline's chief executive Willie Walsh on board, flew to a height of 40,000ft on Sunday before landing safely in Cardiff.
The Swindon-based Natural Environment Research Council was sending up a plane on Monday to monitor the levels of ash from the Icelandic volcano.
Football matches
Cassandra Williams, who had been expecting to start her new job as a head teacher in Norfolk on Monday, is among thousands of Britons stranded.
Ms Williams, who is currently in Hong Kong, said: "There are lots of children meant to be taking GCSEs and A levels and they are very worried about when they might be able to fly to get home."
The flight ban could also affect two English teams involved in Europa League semi-finals.
Liverpool are due to fly to Spain to play Athletico Madrid and Fulham are scheduled to play in Hamburg on Thursday.
Governing body Uefa said it would make a decision about the matches later in the week.
And the 2010 European Gymnastic Championships in Birmingham has been delayed by a day, but organisers plan to go ahead this week despite the travel chaos.
Gymnasts have arrived in the city from countries including Austria, France, Slovakia and Croatia after boarding buses and ferries.
Competition director Tricia Jephcott said: "It's the Dunkirk spirit, and everyone is determined to arrive on time."
A statement from the air traffic control body Nats said: "Conditions around the movement of the layers of the volcanic ash cloud over the UK remain dynamic.
"We are working closely with government, airports and airlines, and airframe and aero engine manufacturers to get a better understanding of the effects of the ash cloud and to seek solutions."
He added: "We will continue to monitor Met Office information and review our arrangements in line with that. "
Airports across England have been left deserted by the flight ban - but many nearby hotels have seen a boost to business catering for stranded passengers.
A Foreign and Commonwealth Office 24-hour consular helpline has been set up on 020 7008 0000 for people stuck abroad.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.
Planes will remain grounded across England until at least 0100 BST on Tuesday, with further announcements expected later.
The flight ban has left hundreds of thousands of passengers stranded across Europe since the Icelandic volcano erupted on Thursday.
Emergency meeting
Some schools in England have been forced to close because pupils and staff are stranded abroad.
Ministers have attended a meeting of the government's emergency Cobra committee at Downing Street to discuss the ash crisis.
Ahead of the meeting on Monday, Cabinet Office Minister Tessa Jowell denied that the government had been too slow in its reaction.
Ms Jowell said consular staff were on hand at airports to assist stranded passengers unable to return to England.
Lord Adonis has said the government is considering using Spain as a hub to repatriate stranded citizens, with the help of the Royal Navy. British Airways has sent up a test flight from Heathrow Airport to see if commercial plane journeys could resume.
The Boeing 747, which had the airline's chief executive Willie Walsh on board, flew to a height of 40,000ft on Sunday before landing safely in Cardiff.
The Swindon-based Natural Environment Research Council was sending up a plane on Monday to monitor the levels of ash from the Icelandic volcano.
Football matches
Cassandra Williams, who had been expecting to start her new job as a head teacher in Norfolk on Monday, is among thousands of Britons stranded.
Ms Williams, who is currently in Hong Kong, said: "There are lots of children meant to be taking GCSEs and A levels and they are very worried about when they might be able to fly to get home."
The flight ban could also affect two English teams involved in Europa League semi-finals.
Liverpool are due to fly to Spain to play Athletico Madrid and Fulham are scheduled to play in Hamburg on Thursday.
Governing body Uefa said it would make a decision about the matches later in the week.
And the 2010 European Gymnastic Championships in Birmingham has been delayed by a day, but organisers plan to go ahead this week despite the travel chaos.
Gymnasts have arrived in the city from countries including Austria, France, Slovakia and Croatia after boarding buses and ferries.
Competition director Tricia Jephcott said: "It's the Dunkirk spirit, and everyone is determined to arrive on time."
A statement from the air traffic control body Nats said: "Conditions around the movement of the layers of the volcanic ash cloud over the UK remain dynamic.
"We are working closely with government, airports and airlines, and airframe and aero engine manufacturers to get a better understanding of the effects of the ash cloud and to seek solutions."
He added: "We will continue to monitor Met Office information and review our arrangements in line with that. "
Airports across England have been left deserted by the flight ban - but many nearby hotels have seen a boost to business catering for stranded passengers.
A Foreign and Commonwealth Office 24-hour consular helpline has been set up on 020 7008 0000 for people stuck abroad.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.