The islands close to Koh Samui offer some of the most rewarding day trips and multi-day excursions in Thailand — from the world-famous diving around Koh Tao to the dramatic limestone karsts of Ang Thong Marine Park and the floating bungalows of Koh Phangan. Koh Samui's position in the Gulf of Thailand places it within easy reach of an extraordinary concentration of island destinations, each with a completely different character. This complete guide covers every major island close to Koh Samui — distances, transport options, what makes each unique and whether it's worth a day trip or a multi-night stay.
According to the Tourism Authority of Thailand, the Gulf of Thailand archipelago surrounding Koh Samui — including Koh Phangan, Koh Tao and the 42 islands of Ang Thong Marine Park — represents one of the most accessible multi-island regions in Southeast Asia, with ferry connections running multiple times daily between all major islands.
🏝️ Book Island Tours from Koh Samui — GetYourGuide →
Islands Close to Koh Samui — Quick Overview
| Island | Distance | Travel Time | Best For | Day Trip / Stay |
|---|---|---|---|---|
| Koh Phangan | ~15km | 30–45 min ferry | Full Moon Party · Beaches · Nightlife | Both |
| Koh Tao | ~50km | 1h30–2h ferry | Diving · Snorkeling · PADI courses | Both |
| Ang Thong Marine Park | ~30km | 1h–1h30 boat | Snorkeling · Kayaking · Viewpoint | Day trip only |
| Koh Mat Sum (Pig Island) | ~15km | 30–45 min boat | Swimming pigs · Snorkeling | Day trip |
| Koh Tan / Koh Mudsum | ~10–15km | 30 min boat | Beaches · Snorkeling · Quiet | Day trip |
| Koh Yao Noi | Andaman coast | 3–4h (fly Phuket + boat) | Luxury resorts · Phang Nga Bay | Multi-night |
| Koh Phi Phi | Andaman coast | 3–4h (fly Phuket + ferry) | Maya Bay · Diving · Nightlife | Multi-night |
Islands Close to Koh Samui — Koh Phangan
Koh Phangan is the closest major island close to Koh Samui — just 30–45 minutes by ferry, making it the most accessible inter-island destination from Koh Samui. The island is world-famous for the Full Moon Party at Haad Rin Beach — a monthly all-night beach party that attracts up to 20,000 visitors. Beyond the party scene, Koh Phangan has a genuinely diverse character: Thong Nai Pan Beach in the north-east is one of the most beautiful and least developed beaches in the Gulf of Thailand, while the interior offers waterfalls, viewpoints and a significant yoga and wellness retreat culture.
| Detail | Koh Phangan |
|---|---|
| Ferry from Koh Samui | Na Thon / Maenam Pier → Thong Sala |
| Duration | 30–45 minutes |
| Price | 150–250 THB |
| Highlights | Full Moon Party · Thong Nai Pan · Bottle Beach · Phaeng Waterfall |
| Best for | Party travellers · Yoga retreats · Beach exploration |
For visitors based on Koh Samui, Koh Phangan works well as either a day trip (Full Moon Party night trip, returning the same night or next morning) or a 2–3 night extension to a Koh Samui stay. The proximity makes it the easiest of all the islands close to Koh Samui to combine into a single itinerary.
Islands Close to Koh Samui — Koh Tao
Koh Tao — “Turtle Island” — is the diving capital of the Gulf of Thailand and one of the cheapest places in the world to get PADI certified. The island's clear water, abundant reef life and dense concentration of dive schools have made it a rite of passage for backpackers throughout Southeast Asia. Beyond diving, Koh Tao has excellent snorkeling directly from several beaches, dramatic viewpoints (John-Suwan Viewpoint is among the most photographed in Thailand) and a more laid-back atmosphere than Koh Phangan.
| Detail | Koh Tao |
|---|---|
| Ferry from Koh Samui | Na Thon / Maenam Pier → Mae Haad |
| Duration | 1h30–2h (Lomprayah) |
| Price | 450–600 THB |
| Highlights | PADI diving · Shark Bay snorkeling · John-Suwan Viewpoint · Sairee Beach |
| Best for | Divers · Snorkelers · Multi-day stays |
⛴️ Book Koh Samui to Koh Tao Ferry — 12Go Asia →
A Koh Tao day trip from Koh Samui (2h each way plus time on the island) is tight but doable for snorkeling at Shark Bay or Mango Bay. However, if diving interests you at all — even a single Discover Scuba session — staying 2–3 nights on Koh Tao is dramatically better value and experience than a rushed day trip. Among all islands close to Koh Samui, Koh Tao rewards an overnight stay more than any other.
Islands Close to Koh Samui — Ang Thong Marine Park
Ang Thong Marine Park — 42 limestone karst islands scattered across the Gulf of Thailand — is widely considered the single best day trip from Koh Samui. The park's main island, Koh Wua Talap, has a steep viewpoint trail delivering a panoramic view over the entire archipelago, while Koh Mae Ko contains an emerald lagoon (Thale Nai) accessible via a short jungle climb. Snorkeling around the islands reveals healthy coral and abundant reef fish, and sea kayaking through narrow channels between the limestone formations is one of the most memorable activities available from Koh Samui.
| Detail | Ang Thong Marine Park |
|---|---|
| Departure | Na Thon Pier (organised tour boats) |
| Duration | 1h–1h30 boat to main island |
| Tour price | 1,200–2,000 THB (full day, includes lunch) |
| National park fee | 300 THB (often included in tour price) |
| Highlights | Koh Wua Talap viewpoint · Thale Nai lagoon · Snorkeling · Kayaking |
| Best for | Everyone — the essential Koh Samui day trip |
🏝️ Book Ang Thong Marine Park — GetYourGuide →
Islands Close to Koh Samui — Koh Mat Sum (Pig Island)
Koh Mat Sum — universally known as “Pig Island” — is one of the most photographed of the smaller islands close to Koh Samui. A small population of semi-wild pigs swim out to greet visiting boats, creating one of the most surreal and shareable moments available on any Koh Samui day trip. Beyond the pigs, the island has a small but beautiful beach and decent snorkeling — most tours combine Pig Island with several of the other “Five Islands” (Koh Tan, Koh Matra and others) in a half-day or full-day circuit.
| Detail | Koh Mat Sum (Pig Island) |
|---|---|
| Distance from Koh Samui | ~15km · 30–45 min boat |
| Tour price | 800–1,500 THB (half–full day, Five Islands combo) |
| Highlights | Swimming pigs · Snorkeling · Beach time |
| Best for | Families · Photography · Half-day activity |
🐷 Book Five Islands + Pig Island — GetYourGuide →
Islands Close to Koh Samui — Koh Tan and Koh Mudsum
Koh Tan and Koh Mudsum are smaller, less-visited islands close to Koh Samui located just off the south coast near Lamai. Both offer beautiful, quiet beaches and good snorkeling without the crowds of the more famous destinations — Koh Tan in particular has a small local fishing community and a genuinely peaceful atmosphere. These islands are typically included as additional stops on Five Islands tours or can be reached via longtail boat charter from Lamai or Bang Kao for a more private experience.
Islands Close to Koh Samui — Andaman Coast Extensions
For visitors with more time, Koh Samui's position also makes it a gateway to the Andaman coast's spectacular islands — though these require flying to Phuket first rather than a direct boat connection:
Koh Yao Noi: A peaceful island in Phang Nga Bay between Phuket and Krabi, known for luxury resorts (Six Senses, Cape Kudu), limestone karst views and proximity to James Bond Island and Hong Island. Reached via 1h15 flight to Phuket plus 45min–1h speedboat from Ao Po Marina. See our complete Koh Yao Noi hotel guide for the best properties.
Koh Phi Phi: Home to the world-famous Maya Bay (“The Beach”), Koh Phi Phi combines dramatic limestone scenery with vibrant village nightlife. Reached via flight to Phuket plus ferry (45min–1h30). Read our complete Phi Phi Island guide for Maya Bay's 2026 visitor cap and booking tips.
Racha Island: Famous for some of the most vividly turquoise water in Thailand, located south of Phuket. Best as a day trip combined with Phuket. See our Racha Island guide for the best bays and resort options.
Islands Close to Koh Samui — Multi-Island Itinerary
| Days | Itinerary | Islands Covered |
|---|---|---|
| 3–4 days | Koh Samui base + Ang Thong day trip + Pig Island day trip | Koh Samui · Ang Thong · Pig Island |
| 5–7 days | Above + 2–3 nights Koh Phangan or Koh Tao | + Koh Phangan or Koh Tao |
| 10–14 days | Koh Samui → Koh Phangan → Koh Tao circuit | All Gulf islands |
| 14+ days | Gulf circuit + fly to Phuket → Koh Yao Noi / Phi Phi | Gulf + Andaman extension |
Islands Close to Koh Samui — Practical Tips
- Book day trips with free cancellation: Boat-dependent tours to Ang Thong and the Five Islands can be affected by weather. Book via GetYourGuide for free cancellation rather than non-refundable local agency tours.
- Lomprayah for Koh Phangan and Koh Tao: The Lomprayah high-speed catamaran is the most reliable and comfortable ferry operator for the Gulf islands. Book via 12Go Asia for guaranteed connections, especially in peak season (December–April).
- Combine islands logically: Koh Phangan and Koh Tao are on the same ferry route — a multi-island itinerary visiting both in sequence (Koh Samui → Koh Phangan → Koh Tao → back to Koh Samui) is far more efficient than separate round trips.
- Andaman extensions need a full day: Koh Yao Noi and Koh Phi Phi are not feasible as quick add-ons — budget at least 3–4 days including the flight to Phuket, the boat transfer and time on the island itself.
- Weather affects boat-dependent islands more: October–November (NE monsoon) sees frequent cancellations for Ang Thong and the smaller island tours. Koh Phangan and Koh Tao ferries are more weather-resilient due to larger vessels.
Islands Close to Koh Samui — Book Your Tours
Explore Islands Close to Koh Samui
Day trips · Ferries · Free cancellation
FAQ — Islands Close to Koh Samui
What islands are near Koh Samui?
The closest islands close to Koh Samui are Koh Phangan (30–45 min ferry, Full Moon Party), Koh Tao (1h30–2h ferry, diving), Ang Thong Marine Park (1h–1h30 boat, 42 islands, day trip only), Koh Mat Sum / Pig Island (30–45 min, swimming pigs), and Koh Tan / Koh Mudsum (30 min, quiet beaches). For Andaman coast extensions, Koh Yao Noi and Koh Phi Phi are reachable via Phuket.
Which island near Koh Samui is best for a day trip?
Ang Thong Marine Park is widely considered the best single-day excursion from Koh Samui — 42 limestone islands, a panoramic viewpoint, an emerald lagoon and excellent snorkeling. Pig Island (Koh Mat Sum) combined with other Five Islands is the best half-day option, particularly for families.
Can you visit Koh Phi Phi from Koh Samui?
Yes, but it requires flying to Phuket first (1h15) followed by a ferry to Koh Phi Phi (45min–1h30) — a 3–4 hour journey each way. This makes Koh Phi Phi unsuitable as a day trip from Koh Samui; plan a multi-night stay if visiting. See our complete Phi Phi guide for planning details.
Continue Reading
- Ang Thong National Marine Park — Complete Guide
- Phi Phi Island the Beach — Maya Bay Guide
- Hotel Koh Yao Noi Thailand — 12 Best Hotels
- Racha Island — Complete Guide
- Koh Tao to Samui — Ferry Guide
Some links are affiliate links. InsideSamui.com earns a commission via GetYourGuide and 12Go Asia at no extra cost to you. Updated 2026.