British Airways has suspended all flights from England to Scotland until 2pm on Tuesday because of a shift in the direction of the cloud of Icelandic volcanic ash. The Dutch airline KLM has also cancelled 16 flights to Scotland and England while Flybe has axed journeys from Aberdeen and Inverness.
EasyJet has called off flights to and from Edinburgh, Glasgow, Inverness and Aberdeen operating between 5am and 9am on Tuesday and 36 have been cancelled by Glasgow-based Loganair.
Airports in Scotland have remained open but services from Barra, Benbecula and Tiree airports are at risk from the cloud.
US President Barack Obama flew to London from Ireland early in an effort to avoid potential delays.
And football team Barcelona announced they will fly to London on Tuesday - earlier than planned - to prevent disruption before their Champions League final at Wembley on Saturday.
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The latest Met Office prediction showed the plume would cover Scotland and Ireland by 6am on Tuesday.
And the latest prediction by the Volcanic Ash Advisory Centre at the Met Office indicated ash would be present up to 20,000ft over almost all of the UK by midday on Tuesday.
Air traffic control company Nats has advised passengers to check with their airline before travelling to these airports.
Transport Secretary Philip Hammond said the ash had already caused "modest delays" to some flights including some Atlantic services.
"We continue to monitor the situation in Iceland closely in conjunction with the Met Office," he said.
"There have already been some modest delays to flights, particularly those crossing the Atlantic, due to the need for those flights to avoid areas of high ash concentration, and there could be further disruption later in the week, but we are doing everything we can to keep this to a minimum."
