Arriving by flight:
All flights to Chennai (formerly Madras) arrive at the Anna International Terminal or Kamaraj Domestic Terminal of the Chennai Airport (Airport Code: MAA).  From the airport there are pre-paid cabs that will bring you to the IIT.  Regular pre-paid taxis (non-AC) costs about Rs. 300/-, Fast Track  Is about Rs. 450/- and Aviation Express is about Rs. 600/-.  You can buy the prepaid cab coupon from the counters just before you exit from the terminal building.

Arriving by train:
Chennai is served by two main train stations – Chennai Central and Chennai Egmore.  Chennai Central station, the city's largest, provides access to other major cities as well as many other smaller towns across India. Chennai Egmore is a terminus for trains to destinations primarily within Tamil Nadu; it also handles a few inter–state trains. The Chennai suburban railway network, one of the oldest in the country, consists of four broad gauge sectors terminating at two locations in the city, namely Chennai Central and Chennai Beach. The fourth sector is an elevated Mass Rapid Transit System which links Chennai Beach to Velachery and is interlinked with the remaining rail network.

Arriving by bus:

The IIT campus is located on the Sardar Patel Road, midway between the Raj Bhavan and Adyar bus terminus and is around 12 km from Chennai Central Railway Station. Other landmarks include the Guindy Snake Park near the IIT main gate and the Central Leather Reasearch Institute (CLRI) campus opposite the IIT campus.

If you have light luggage (a bag or an attache) you could consider taking a bus to IIT. The bus stop is just across the road from the Central Railway Station. You could use the subway to cross the road which is perpetually busy. There are direct buses to IIT, which start at the Central Station bus stop. If you take any of them, get down at Gandhi Mandapam, which is at walking distance from the IIT main gate. Otherwise, take any bus to Saidapet and from there, any bus heading for Adyar or Besant Nagar which will drop you right in front of the IIT gate. You could also take any bus to Adyar; there are frequent buses from Adyar Signal to the campus. Once you reach the In gate, there are buses to Gajendra Circle (near the administrative block and Central Library), the academic zone and the hostels (they are around 3.8 km from the main gate!) almost every 30 minutes.

From To Buses Nos.
Central Station Gandhi Mandapam, IIT, Adyar 18B,21G
Saidapet IIT, Besant Nagar 5B, 23C, 47A, 47, 5E, 19B
Egmore Station IIT, Adyar 23C
Adyar Traffic Signal IIT 23C, 5B, 47A, 47D, 147, 5A

If you have luggage, an auto-rickshaw or taxi would it would be the most comfortable option. The fare will be about Rs. 250 for an auto-rickshaw and Rs. 350 for a taxi. If you arrive at Egmore Station, you could take buses to IIT, Gandhi Mandapam or Adyar from where there are number of buses to the IIT. Current auto- rickshaw and taxi fares from Egmore are approximately Rs.200 and Rs.300 respectively.