Travelling between Bangkok and Siem Reap should be relatively simple. After all it's little more than 400 Km. An hour by plane should be easy and very cheap on a continent that prides itself on cheap air travel. Well, think again! Bangkok Airways appear to have a monopoly here and prices are extraordinarily high for such a short journey. At the time of writing, checking for flights two weeks ahead of travel shows return prices of approximately 17,000THB. I am sorry but over US$500 for a one hour flight is indefensible.