Metro : Metro train is one of the best option to reach New delhi from Indra Gandhi Airport. The entire journey take only 19 minute. The fare is only Rs. 100 per person.
IGI Airport - Airocity - Daula Kuan - Shivaji Stadium - New Delhi
Timings : The first metro is starting at 4 : 45 AM and last metro is at 23 : 45 PM
Bus : Delhi Transport Corporation is runing many buses from Airport to New Delhi. The fare for non ac bus is Rs. 15 and AC bus tickets fare is 40. But bus is time taking the journey will take more than 1 hours.
Taxi : Just out of exit gate there are a prepaid taxi booth, ou can book taxi from Airport to New Delhi. You can also book cab online from travel agents website or call them directly.