Bangkok is served by the port of Laem Chabang, but is not actually a cruise port. Together, Laem Chabang acts as the embarkation for just one sailings per year from Norwegian to Asia.
Prices are around steady throughout the year. Overall sailings from Bangkok are moderately expensive compared to other ports. The graph below shows the monthly average cost per day for cruises from Bangkok (Cruises only depart from Bangkok between February and February).