It can be a wee bit of a hassle and a tad daunting if you're intending to transfer from Chanthaburi to anywhere, by bus. While the bus terminal provides buses to several provinces in Thailand, most, if not all speak in Thai. Some may attempt to converse in English, but due to their ability, it may be lost in translation and your trip details may be jeopardised if your queries are not answered correctly. Hence the advise is to fork out a bit more for a comfortable and stress-free ride, especially to Suvarnabhumi where your aircraft is waiting for you to board. By bus, it may be around 300-400B. But by transfer, the baht paid is well worth it. VIP style transfer. Hassle-free.