India Gate can be reached via flight, train or bus. It's also connected with road so you can hire a taxi, or self-drive to reach here if you like.
Reaching India Gate by bus:
Roorkee Bus Depot
(see New Delhi) is the nearest major bus station, with buses to other cities.
National Gallery Of Modern Art Bus Stand (India Gate (Sub-Locality)) is a local bus stop with limited bus frequency.
Driving to India Gate from major nearest cities/towns: