Bangkok is served by the ports of Laem Chabang and Klong Toey, but is not actually a cruise port. Together, the cruise port of Laem Chabang and Klong Toey serves as the point of embarkation for only one annual sailings from Norwegian to Asia.
On average sailings from Bangkok are moderately expensive compared to other ports. Look at the diagram below for the monthly average cost per day (Cruises only depart from Bangkok between January and November). Prices are about equal throughout the year.