Airport should cost you about 400 Rupees.
Delhi Railway Station
Formally Delhi Junction (code DLI), but best referred to as "Old" Delhi Station for clarity. Like New Delhi RS, this station is huge and confusing. The platforms are not in linear order, with some hidden in the west and east wings of the stations. The railway station is served by Metro Line 2 Chandni Chowk station, with an entrance just outside at the east end of the station and also just over the main road outside (last metro at about 23:30). If taking an Auto Rickshaw from here, the prepaid desk will often try and charge you as much as three times the actual price quoted on the official price guide displayed clearly in their window - bargaining is sadly often cheaper.
Hazrat Nizamuddin
Hazrat Nizamuddin (code NZM) is the departure point of many trains heading south. Practically speaking, the only way to get here is by taxi or car. The budget alternative is to take a bus to the Sarai Kale Khan Inter State Bus Terminal (ISBT) on the ring road and then walk over to the station (400 m). It's the least chaotic of the Big Three, but still pretty big and poorly signposted; listen to the announcements to figure out your train. The station has a pretty good food court that sells inexpensive, hygienic takeaway snacks including sandwiches and samosas.
If you have some time to kill, pay a visit to Humayun's Tomb, which is so close to the station that you can hear the announcements from inside — although it's a long, circuitous walk from the station to the entrance.
Anand Vihar
Anand Vihar Terminal (code ANVT) is Delhi's newest station, located well to the east of the city near Ghaziabad - Delhi Border. Repeatedly delayed, the station finally opened in December