The distance from Lokpriya Gopinath Bordoloi International Airport - Guwahati (GAU) to IIT Guwahati is about 22 kms. In the Arrival Lounge (inside Airport), there is a pre-paid taxi counter. You can take a prepaid taxi from the airport to reach IIT Guwahati campus.
The distance from Guwahati Railway Station (GHY) to IIT Guwahati is about 18 kms. If you are arriving at Guwahati Railway Station by rail, come out through Platform No.1 exit gate (Panbazar or Lakhhtokia side). A limited number of IIT buses run regularly from Guwahati city - Lakhtokia (Near Don Bosco School's Church/ Cotton College Boys Hostel, which is about 0.5 km from the Guwahati Railway Station) to IIT Campus. Taxis and auto-rickshaws are available to commute from Guwahati Railway Station to IIT Guwahati.
Shuttle bus service is available to/from Guwahati Railway Station to IITG, details of which can be found here:
The distance from Kamakhya Railway Station (KYQ) to IIT Guwahati is about 13 kms. For commuting from Kamakya Railway Station, you may have to hire taxi or auto-rickshaws.