Flight Netaji Subhas Chandra Bose International Airport departs from Kolkata Netaji Subhas Chandra Bose International Airport at 20:20 and arrives at Singapore Changi Airport at 03:15.
The flighttime is about 4h 25m. The distance travelled ("as the bird flies"): 1717 Km. So the average speed is roughly 389 Km.
There is an 2.5 hour time difference between Kolkata and Singapore