As of June 2011, Duong Dong Airport only has flights operated by Vietnam Airlines and Air Mekong. Air Mekong maintains direct flights from Hanoi and Ho Chi Minh City to Phu Quoc, while Vietnam Airlines offers route from Can Tho into the same destination as well. The fares for those flights are very different, varying from 40 to 200 USD with respect to the economy and route of business class. You may either contact these airlines or the ticket agencies for reservation.