How to get here...
Now www.bangkokair.com for your domestic flights from Bangkok to Koh Samui, you can book online.
Now if you are looking at seeing some islands, and a bit of Thailand,that you would not see normally, then flying down to Surat Thani, which is the main land province, is a must, you fly into Surat Thani from Bangkok then minibus, and ferry, from Donsak, to Nathon, Koh Samui.
Two flights a day, go to www.airasia.com a lot cheaper but a great trip to see more of Thailand...
Time scale for this little excursion is one hour flying time, one hour to Donsak Ferry port, then one and a half hour's by ferry, to Koh Samui Island for the traveller, this one is for the adventurous.
Eva Air From Heathrow, good quality airline favourably priced.
Emirates From Gatwick, Dubai stop over, to Bangkok (13 hours). Also competitive and reliable.
Thai Air From Heathrow, direct to Bangkok (11 hours). More up-market with the largest leg room and excellent service but you could pay around 20% more. Book early as the price index increases on planeload.
Ethihad airlines new and competitive in price, new planes excellent prices, stop over Doha, but from Heathrow.