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A decision is expected later on whether Cardiff airport will reopen.Restrictions could be lifted over Wales as airspace in Scotland, Northern Ireland and parts of northern England is due to reopen from 0700 BST.
The CBI in Wales has warned that should restrictions continue they would soon turn from an "inconvenience" for many businesses to having a "real impact".
The Met office has warned that volcanic activity in Iceland was increasing and that the situation was unpredictable.
A Cardiff Airport spokesman has said managers would be meeting airline and tourism chiefs to draw up plans for when flights could resume.
One of the issues will be deciding on priorities, as to whether to concentrate on repatriating stranded passengers or to carry on normal schedules.
Flights in the UK and across Europe have been grounded after the volcano erupted last Wednesday.
David Rosser, director of the CBI in Wales, said: "To date I think its been mainly inconvenience with individuals stuck away from home and away from the office.
"As the time moves on it will become a real business impact as we start to see components running out, orders incapable of being shipped, and then it will start to rack up the costs for Welsh business."
Ferry operators in Wales have seen significant increases in passenger numbers since the National Air Traffic Service (Nats) halted all flights in the UK. Stena Line said that since the air travel crisis began last Thursday, it had carried 55,000 passengers on its five Irish Sea routes, 30,000 more than it would expect at this time of year.
Fastnet Line, which operates services between Cork in Ireland and Swansea, has put on extra sailings to cope with demand.
Arriva Trains Wales said it had added 10,000 seats to its services to the Welsh ferry ports over the last five days.
Ferris Coaches, which operate out of Nantgarw in south Wales, sent four double-decker buses to Spain on Monday to collect people in resorts there, with the first due back later.
The company's said they sold 300 seats in four hours on Sunday and had a waiting list of 200 people.
"The problem I've got is getting drivers. It's on our peak season so driver availability isn't great," said Jason Ferris.
'It's unbelievable
"We're calling up part time drivers and have some based in the south of France.
"But I had so many calls yesterday if I had 100 coaches I could have filled them. I've never known anything like it, it's unbelievable."
The company is dropping people off in Reading, Swindon and Bristol en route to Cardiff.
The Foreign Office website (www.fco.gov.uk) contains advice for stranded UK citizens.
UK citizens needing consular assistance can also contact the embassy in the country they are in. Contact details are available on the Foreign Office website.
An emergency number - 020 7008 0000 - is available for relatives of those stranded who are concerned about their safety or well-being.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.