During the flooding in Thailand, I was in and out of the capitol city three times and never saw anything unusual besides everything being really quiet. When I was there last time ten days ago, the city was already back to business as usual. None of the Starwood properties were affected.
Starwood has now launched a Thailand sale that will last until the end of January for stays from January 4th until 31st of March. The rates offered are up to 50% off the Best Available Rate.
These are the rates listed as up to 50% off the Best Available Rate. Sheraton Grande Sukhumvit came at the offered price for weekends in January. For the dates I checked, the lowest rate I could find for the Le Meridien Bangkok was 3300 THB. The sale rate for the St Regis Bangkok was about 1000 THB lower than the 6900 THB rate listed.