DEL and HKT are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. DEL to HKT refers to a flight route from New Delhi Indira Gandhi Intl Airport to Phuket City Airport. Mumbai Chhatrapati Shivaji Intl Airport (BOM), Bengaluru Intl Airport (BLR), Hyderabad Rajiv Gandhi Intl Airport (HYD), Chennai Airport (MAA), Ahmedabad Airport (AMD) are some additional IATA codes for airports related to your trip.