When it is time to head back to Bangkok from Koh Samui, the options are the same in reverse. By air, you can be in Bangkok in roughly 75 minutes from wheels-up. Morning departures are most frequent; early bookers get the best fares from THB 744.
For the overland-and-sea route, your journey begins at one of Samui's three main piers — Bangrak, Mae Nam or Nathon — with a ferry crossing to the Gulf coast followed by a long-distance coach or train north to Bangkok. Overnight sleeper coaches are a practical option: you spend the night in transit and arrive in the capital in the morning, with no extra accommodation cost.
Train connections from Surat Thani offer a scenic alternative for travellers with time on their side. Over 28 operators serve this corridor, with departures from the early hours right through the day. We recommend locking in your ticket early during the December–April high season and over Songkran. The combination of a Gulf crossing and a long-haul leg makes this one of Thailand's classic island-exit journeys.