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The NH8 Delhi-Ahmedbd-Surat-Mumbai 8 lane Highspeed way.
Do not Worry now you can easily reach Old Delhi Airport from International Airport Delhi. You can choose Airport Metro to New Delhi and then change at Rajeev Chowk Metro Station to Chandni Chowk Metro Station. Its will take only INR 70 and 25 minute . Metro is available from 5 AM to 23:50 PM If u have own convence then ok Otherwise many taxies r there. So in a nutshell, its very easy to go from delhi international airport to old delhi railway station. (buses r not there)