Rough guide says you can with Bangkok airways. Bangkok airways site don't have the route. Anyone know if this runs in July/August? I've also e-mailed them if anybody is interested in what they say.
Cheers


Its Trat-Bangkok/Bangkok-Samui. Better try Utapao (Pattaya) Samui direct, its 2.590 Baht online. Or probably Trat/Suratthani with Thai ariways or else if available.

the "connection" is that Bangkok Airways owns both airports
however there's insufficient demand to actually fly direct between the two (I enquired recently at one of their ticket sales offices and nobody thought it likely this might change anytime soon)
next best thing: U-Tapao to Ko Samui
U-Tapao (Sattahip) is much nearer to Trat (Ko Chang, Chanthaburi, Ban Phe, Ko Samet, etc) than Bangkok and the flight from there is cheaper (however it's also much less frequent)