Suvarnabhumi

All the flights to and from Bangkok are from Suvarnabhumi (pronounced soo-van-a-poom) airport these days. Getting to and from Subarnabhumi can take at least two hours; be prepared! 

Airport shuttle costs 150 baht to wherever you go. Line A2 goes to Banglamphu right from in front of the airport exit.  Taxi to Bkk should be about 300 baht; they all have meters.

From in front of the airport there is a free shuttle bus to Subarnabhumi shuttle terminal, and from there you can catch a cheap public bus (~30-40 baht) to Bangkok city. All the buses ending up at the terminal seem to start with numbers 55- ; e.g. 552 (A) goes to Sriyiam-PangNga where you can catch many buses going straight along Sukhumwit Road. 551 goes to/from Victory Monument.