Island Hopping in Thailand: The Complete Route Guide

Island hopping is one of the iconic Thailand experiences, but with so many options it can be paralysing to plan. The key division is between the Gulf of Thailand coast (accessed from the east side of the Kra Isthmus) and the Andaman Sea coast (to the west). The two coasts have different weather seasons — when it's dry on one side, it's often rainy on the other — so the timing of your trip should drive which coast you prioritise. The Gulf of Thailand (Koh Samui, Koh Phangan, Koh Tao) is best November–April; the Andaman side (Phuket, Krabi, Koh Lanta, Phi Phi) is at its best November–April too, but Koh Samui and its neighbours have a second peak in July–August when the Andaman gets its heaviest rains.

The classic southern route links Bangkok by overnight train or budget flight to Surat Thani, then ferry to Koh Samui for resort comforts and a polished beach experience, across to Koh Phangan for the famous Full Moon Party (or just excellent snorkelling and a laid-back vibe between parties), and then north to Koh Tao for some of the cheapest and most accessible diving in Southeast Asia. This Gulf route takes a minimum of 8–10 days done properly. The Andaman route typically starts with a flight to Phuket, then goes south to Phi Phi (iconic but very crowded), east to Krabi and the Railay peninsula, then south to Koh Lanta for a more relaxed, less commercial experience. If you extend further south you reach the Trang Islands (Koh Mook, Koh Kradan) — genuinely beautiful and significantly less visited.

Budget considerations vary significantly by island. Koh Tao remains Thailand's best value island with dive packages including accommodation starting around 5,000 THB for open-water certification. Koh Samui has tilted upmarket and mid-range hotels cost 1,500–3,500 THB. Phi Phi charges a premium for its scenery — budget bungalows start around 1,200 THB and average heavily towards 2,500+ THB. The Trang Islands offer real bargains: bungalows from 600 THB, long-tail charter boats from 1,000 THB shared. Always factor in ferry and speedboat transfers — inter-island transport costs can add 1,000–3,000 THB per hop depending on distance and boat type.

Practical logistics: book ferries and speedboats in advance during peak season (December–January, Songkran in April) as popular routes sell out. Use Lomprayah or Seatran Discovery for reliable Gulf ferry services; Andaman ferries run by multiple operators from Rassada pier in Phuket and Ao Nang in Krabi. The combination boat-bus tickets from tourist agencies are convenient but carry a 20–30% markup versus booking direct. Regarding marine safety: always check life jacket availability before boarding speedboats, avoid travelling in poor weather even if it means missing a planned departure, and be aware that the speedboat taxi between islands is statistically the riskiest transport mode in Thailand.