how long is flight from bangkok to koh samui and how much ? some information abut bangkok airways noperates?

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It's either 1 hr. 5m min. or 1 hr. 30 min. on Bangkok Aiways depending on the type of plane, the larger Airbus 319's get there faster than the smaller planes they use on some flights. Right now through the end of March they are having a special "Thanks Fares" sale, you can get a round-trip flight for as little as 3570 Baht which is as cheap as it gets for flights to Samui. Btw, Bangkok Airways is a great little airline. Check it out for yourself:
http://www.bangkokair.com/

You should try looking at Bangkok Airways website. If you did you would get all the information you need instead of asking here.

confirm
http://spa-thai-guide.blogspot.com/

There are some 12 flights daily.
A return flight booked online, will cost approx 6300BHT + taxes (1400BHT).
Sometimes it's possible to get a last minute deal at the airport if the flight is not heavily booked.