The award was announced on Monday by Airport Council International based on passenger survey at 300 airports around the world.
Along with Delhi, Kolkata airport has won the award for best improvement amongst airports in the Asia-Pacific region.
These awards represent passengers' views on 34 key service indicators and are an objective and accurate indicator of the top worldwide performing airports with regard to passenger service.
"Airports are more than simply points of departure and arrival," said Angela Gittens, Director General, ACI World. "They are complex businesses in their own right. As such, a focus on serving the passenger has become increasingly important to ensuring success. In the fast-changing landscape of worldwide aviation, Airport Service Quality is the key to understanding how to increase passenger satisfaction and improve business performance," she added.