PADI Koh Samui: Courses, Costs and How to Choose a Dive Shop

Featured image: Damian Moore, CC BY-SA 2.0, via Wikimedia Commons.

Which PADI course should you start with?

Use a simple rule based on days. One day suits Discover Scuba Diving. Two days suits Scuba Diver. Three to four days suits Open Water Diver. These are typical durations, and your shop sets the real schedule. Discover Scuba Diving is a try-out, not a certification, so it counts for nothing toward later courses. PADI's course catalog defines each level.

PADI Open Water on Koh Samui, step by step

Open Water starts with eLearning, which typically takes 8 to 10 hours. Do it at home and you save holiday time. Next come confined-water sessions in a pool or calm shallows, where you practice mask clearing, regulator recovery and buoyancy. Ocean dives 1 and 2 usually come next, typically at 5 to 12 m. Dives 3 and 4 go down to 18 m. After dive four, your card is typically issued digitally within 24 to 48 hours. Total time is typically 3 to 4 days, so ask your shop for its exact schedule. Leave a buffer day for weather or a skill that needs repeating. PADI also offers a free online introduction to scuba on its site. Our Koh Samui dive sites guide shows where ocean dives can happen.

How much does PADI certification cost on Koh Samui?

Prices vary by shop, so compare inclusions before comparing totals. As one example, Silent Divers lists Open Water at ฿18,200 on its own site (prices and hours checked November 2026). That figure is specific to one operator, not an island average. It covers eLearning, equipment, four ocean dives, certification fees, transfers, insurance and lunch. A lower headline price can leave some of those out. Our Koh Samui dive shops guide helps with comparing operators.

• eLearning materials
• Confined-water sessions
• All four ocean dives and boat days
• Equipment rental
• PADI certification fee
• Dive insurance
• Hotel transfers
• Lunch and drinks on boat days

How to choose a PADI dive shop on Samui

Treat this as a checklist, not a ranking. A cheap quote that misses eLearning, gear or boat days is the classic mistake. Run each shop through these points before you pay a deposit.

• Confirm PADI membership in PADI's dive-shop locator.
• Ask the maximum students per instructor.
• Check the instructor's languages match yours.
• Ask which boat and which sites the ocean dives use.
• Get the inclusions in writing, using the list above.
• Ask what happens if boats do not run in rough weather.
• Check whether hotel pickup covers your area, such as Chaweng, Lamai or Bophut.

Swim test, medical form and what to bring

PADI's swim test is 200 m of swimming, or 300 m with mask, fins and snorkel. You then float or tread water for 10 minutes. You need to be comfortable, not fast. Everyone completes a medical questionnaire before training. If you answer yes to any question, a doctor must sign off before you dive. Get that sign-off at home, before you fly. Minimum age for Open Water is 15. Ages 10 to 14 take Junior Open Water. Pack swimwear, sunscreen, a towel, a light layer for the boat, sunglasses and a hat. Shops typically supply the scuba gear. Leave a buffer day before your flight home. DAN publishes guidance on waiting after diving.

When to go and what you can dive next

Sea conditions affect scheduling, so check timing early. Our diving season guide covers the calendar. For comfort, read water temperature by month. Once certified, Advanced Open Water is the natural next step. It opens deeper Gulf of Thailand sites. See Koh Samui Marine Life: What You'll Really See and Where for what you may see. Whale shark questions have their own page: whale shark sightings. Rescue Diver and Divemaster follow Advanced for divers who want to keep going.

If You Start With Scuba Diver, How to Finish Later

Scuba Diver can suit a short Koh Samui stay, but it is not the same qualification as Open Water Diver. The course typically takes about 2 days. It certifies you to dive to 12 m with a PADI professional.

That makes it a practical stopping point if you cannot give 3 to 4 days to Open Water on this trip. You can later complete the remaining Open Water training with a PADI shop. Ask the new shop what records it needs before you travel. Keep any course paperwork and confirm how much training remains.

For independent diving with a qualified buddy, complete Open Water Diver instead. Its certification limit is 18 m. Choose the shorter course only if supervised diving suits your immediate plans. If you already expect to dive often, reserving enough time for Open Water usually avoids splitting training across two holidays.