Flight Netaji Subhas Chandra Bose International Airport departs from Kolkata Netaji Subhas Chandra Bose International Airport at 00:30 and arrives at Bangkok Don Mueang International Airport at 04:30.
The flighttime is about 2h 30m. The distance travelled ("as the bird flies"): 1350 Km. So the average speed is roughly 540 Km.
There is an 1.5 hour time difference between Kolkata and Bangkok