Bangkok has some good postal services for those postcards and letters from your vacation in Thailand!

Official Information

I don’t have any maps, but the Web site has a page dedicated to postal services.

There are three places where postal services are provided:

on the 4th floor of departure passenger terminal at gate 10 behind check-in counter row W, open daily for 24 hours
at G aerobridge on the 2nd floor of passenger terminal, open 24 hours
at Suvarnabhumi postal center (in the area of Free Zone) open on Monday – Friday at 08.30 am – 18.00 pm

Only the last one is identified as a post office; the others may be mail drops.

Last updated 19 July 2017