As Rai Leh is on the tip of a peninsula surrounded by ocean and blocked by Nang Mountain, access is only by boat. Longtails depart from Ao Nang (10 min, 100 baht/person, minimum 8 people), Ao Nammao (15 min), and Krabi Town (30 min) on demand, making those places the gateways to Rai Leh. It's also possible to reach Rai Leh via regular ferries that run between Ko Lanta, Ko Phi Phi, and Phuket Town (from Rassada Pier) These are more frequent in the Nov-May dry season: times available from local travel agents, or check online ferry schedules

The Krabi Province, Phuket, Ko Lanta and Ko Phi Phi articles have information on reaching Rai Leh gateways from throughout Thailand. From Bangkok there are flights to Krabi and Phuket, direct bus services, and trains to Surat Thani with onward connections by bus.

If departing from Ao Nang, be aware that you're expected to walk out several metres into the surf before getting on a boat (depending on the tide). It might be best to change into clothes suitable for getting wet, or at the very least be sure you don't have more luggage than you can carry a few metres into the ocean.