For IndiGo, as mentioned on their website, flight numbers 2000 to 2999 will operate from Terminal 2. Flight numbers 5000 to 5899 will fly from Terminal 3. All other domestic flights will operate from Terminal 1.
So, if you are planning to take a flight from Delhi Airport soon, before going to the Delhi Airport, check the terminal from which your flight will start to fly. Because Delhi airport is so big that reaching one terminal from another is a bit tricky and will take time.
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