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The airspace around Glasgow Airport reopened just hours before the government announced that all UK airports would open on Tuesday night.Scottish airspace reopened on Tuesday morning, but Glasgow airspace closed again for six hours as the cloud moved.
UK Transport Secretary Lord Adonis announced that all airports could reopen following discussion with the Civil Aviation Authority.
He said some restrictions would remain in place.
Three Thomas Cook aircraft arrived into Glasgow Airport overnight from Heraklion in Greece, Arrecife in Lanzarote, and Sharm el Sheikh in Egypt.
A BAA spokesman said: "As these airports return to normal operations, it is imperative that passengers contact their airline before travelling to the airport.
"Not all flights will operate during the early period of opening, and we will do everything we can to support airlines and get people moving."
The Civil Aviation Authority announced on Tuesday evening that all UK airports could reopen after safety tests showed engines had "increased tolerance levels in low ash density areas".
Air traffic control company Nats denied it faced Government pressure to ease flight restrictions following the spread of the volcanic ash cloud.
A CAA spokesman said Nats was acting on guidelines that prohibited flights through any type of volcanic ash cloud when it imposed the restrictions last week.
Thousands of passengers remain stranded as a result of the ban which has been in place for most of the country since Thursday.
A ferry which normally runs across the Pentland Firth is being used to bring hundreds of people back from Norway to Scotland.
The Northlink vessel was sent from Orkney to Bergen to pick up the passengers and bring them back to Aberdeen.
On Tuesday, Scotland's mainland airports had flights to and from the Scottish islands, Iceland, the Faroes, the Isle of Man, Belfast, Durham Tees and Newcastle.
A helpline for passengers stranded due to the volcanic ash cloud and concerned relatives has been launched by the Scottish Government.
It is designed to complement the Foreign and Commonwealth Office (FCO) helpline which will remain the main point of contact for travellers needing help while stranded overseas.
The helpline offers "general advice that may be helpful to stranded travellers and their families", including contact details for airlines and travel operators and the latest information issued by travel operators.
The Scottish government helpline number is 0800 027 0504 or from overseas +44 800 027 0504. The Foreign and Commonwealth Office 24-hour consular helpline has been set up on 020 7008 0000 for people stuck abroad.
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