Thai Airways International (THAI) will move all of its flights from Don Mueang airport to Suvarnabhumi airport, starting on March 29, the airline's acting president, Baribgsaj Sangapong, said on Friday.
He admitted the change could be confusing for foreign travellers who have booked the tickets in advance.
Things would be made clearer at a press conference to be held later today, he said.
During the Songkran festival in April, three aircraft would be at the Don Mueang airport to serve travellers who may be confused about the change of airport.
But afterward, all THAI operations would be shifted to Suvarnabhumi airport, he said.