Welcome to Australia's leading independent Frequent Flyer and Travel Resource since 1998!Our site contains tons of information that will improve your travel experience.Joining AFF is fast, simple & absolutely free - register now and take immediate advantage of these great BENEFITS. Once registered, this box will disappear. And you will see fewer advertisements :)
This could be interesting. In BKK, they are planning to move some domestic flights to the old airport. If that is the case for your flight (it probably won't happen for a while) then 2 hours probably isn't enough.
Even at the new airport with the amount of walking involved, it would be pushing the time as well, but still quite possible.
Bangkok Airways close their checkin desk 40 mins before a domestic flight, so you have around 75 mins to clear immigration and head back upstairs. It might be close, but shouldn't be too bad if you move quickly. If your plane is late though, then it would be tough.