The Domestic Airport has four terminals, i.e. Terminal 1A, 1B, 1C & 1D. Terminal 1A caters to domestic flights of Go Air, Indian Airlines and Air India Regional. Flights of other scheduled private airlines viz. IndiGo, Jet Airways, JetLite, Kingfisher Airline, Kingfisher Red and SpiceJet, operate from terminal 1D, along with other executive aircraft/ private aviation activities. Since Terminal 1D came into operation, 1B has been closed. As for Terminal 1C, it caters to the arrivals of the airlines operating from Terminal 1A & 1D. The International Terminal (Terminal 2) caters to the airlines flying to major cities across the world. The airport also has a cargo terminal to handle cargo operations and a separate Hajj terminal for catering to the rush during Hajj.

The brand new Terminal 3 at Indira Gandhi International Airport is under construction, predicted to be the third largest terminal in the world (after completion). It will be a two-tier building, with over 160 check-in counters, 74 aerobridges, duty free shops and other exciting features. Being built in place of the older existing terminals, it will be completed before the commencement of 2010 Commonwealth Games. Terminal 3 will be connected to Delhi by an eight lane motorway and the Delhi Mass Rapid Transit System. Terminal 4 and 5 will also be built at a later stage.