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The volcanic ash cloud emanating from Iceland will shut Cardiff airport until at least 0100 BST on Sunday.The National Air Traffic Service (Nats) said most flights would be grounded, although domestic flights may take off from Scotland and Northern Ireland.
Passengers should contact airlines or tour operators about specific flights before travelling to the airport, Cardiff airport operator TBI said.
However, ferry operators in Wales continue to see a boost to bookings.
Singer Whitney Houston was forced to take a ferry from Holyhead on Anglesey to Dublin in order to make her concert in the Ireland capital, according to reports.
The 46-year-old star, who is in the middle of her Nothing But Love world tour, left Birmingham, where the European leg of the tour began, travelling by car to the north Wales port. A Nats statement said: "The volcanic ash cloud from Iceland is moving around and changing shape.
"Based on the latest information from the Met Office, Nats advises that the restrictions currently in place across UK controlled airspace will remain in place until at least 0100 BST on Sunday."
On Friday, Cardiff Airport's business development director Steve Hodges said the airport could "only apologise" but the cancellations were due to "extraordinary circumstances" and he asked those due to travel for their patience.
"Safety has to be paramount," he added.
"There is plenty of evidence of the impact dust can have on engines and I'm sure most people are now aware of that."
A Stena spokesman said there had been a "significant" rise in ferry passengers because of the airline problem, while Irish Ferries said inquiries for reservations had quadrupled compared to the usual volume of calls.
Arriva Trains Wales said it was experiencing increased demand for services as air passengers switched to ferries and trains for travel between the UK and Ireland.
Extra capacity is being added to train services to and from Fishguard Harbour in Pembrokeshire and Holyhead on Anglesey.
Ten chefs from the Welsh national culinary team who are due to compete in a competition in Singapore have been affected by the disruption.
The chefs have spent months preparing for the culinary event, which is due to start on Tuesday, but their flight from Manchester was cancelled.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.