Flight Netaji Subhas Chandra Bose International Airport departs from Kolkata Netaji Subhas Chandra Bose International Airport at 00:05 and arrives at Bangkok Suvarnabhumi Airport at 04:10.
The flighttime is about 2h 35m. The distance travelled ("as the bird flies"): 1366 Km. So the average speed is roughly 529 Km.
There is an 1.5 hour time difference between Kolkata and Bangkok