Phu Quoc International Airport is the hub connecting the island with Vietnamese mainland and several international destinations such as Guangzhou, Chengdu, Kunming, Hangzhou, Wuxi, Shanghai (China), Seoul, Siem Reap, Bangkok, and Singapore. Best of all, because Phu Quoc is classified as a Special Economic Zone, visitors of all nationalities flying in/ out of Phu Quoc only (and not visiting the Vietnamese mainland) are granted a visa exemption to stay up to 30 days. Please check with the Vietnamese embassy or consulate in your country for additional requirements including having a passport valid for at least 6 months beyond your stay and a round-trip ticket to/ from Phu Quoc.
If traveling from Cambodia, Ha Tien is easily accessible from the seaside resort towns of Kep (25 km) and Kampot (66 km). Most fast and slow ferries will take you to Bai Vong Port on Phu Quoc, close to Long Beach. Again, groups with aged people and children should not look for this route to avoid seasickness and any misadventures. From there to the main town of Duong Dong, there are multiple transportation options, including motorcycle taxis (each able to carry one passenger with minimal luggage), taxis and shared mini-buses.