Connectivity :
Situated exactly in the middle of Karnataka, Harihar has a good connectivity from South and North.
BY AIR
The nearest airport is at Hubli 131 km from Harihar. From there one can take flights to Bangalore and Mumbai. The nearest international airport is 275 km away in Bangalore, from where one can take flights for most of the important cities in India. Harihar also has a private airport owned by Aditya Birla Group in their campus and often used by politicians and famous personalities.
Nearest Airport:
Nearest airport to Harihar is the Hubli Airport, which is 131 km from Harihar and one more mini airport is in Aditya Birla Company Harihar.
BY RAIL
Harihar is connected with most of the metros like New Delhi, Mumbai, Bangalore and Chennai through regular trains. Harihar is a new railway junction which connects Hospet and Bellary via Kottur from Amaravathi Colony (Bathi)
BY ROAD
With NH4 (Part of Golden Quadrilateral) passing close by there is a good network of roads that connects Harihar to other important cities of the region.
Buses
It is a 2.5 hours drive from Hubli (131 km) and 5 hours drive from Bangalore (278 km). Most of the buses which ply from/to North Karnataka to/from South Karnataka (if not all) go via this place. The town is 14 km from Davanagere city, was earlier a part of Chitradurga district (78 km). This town is also near to Hampi, a historical place and Tungabhadra Dam, Hospet. Most of the buses plying from North Karnataka to Dharmasthala, Shimoga, Mysore go via Harihar.
Trains
Good train facility, again connecting Hubli - Bangalore route. Intercity express "Rani Chennamma Express" and Janashatabdi Express are the major trains which people there rely upon and commonly commute in. Other trains include Hubli-Bangalore Fast Passenger which is by all means the convenient train to go to Bangalore (departs from Harihar at 8:30 pm, arrives at Bangalore at 7:10 a m) or to come to Harihar (departs from Bangalore at 11:00 pm and arrives at Harihar at 7:00 am). Another train which has come to light recently is the Dharwar-Mysore express train which departs from Harihar at 10:45 pm.
Train# 12079, 12080 : Janashatabdi express
Train# 56912 : UBL (Hubli Junction) to SBC (Bangalore city) fast passenger
Train# 586 : SBC (Bangalore city) to UBL (Hubli Junction) fast passenger
Intercity express Dharwar to Bangalore, Bangalore to Dharwar.
Dharwar Mysore Express
Chalukya Express Bangalore to Mumbai and back
Sharavathi Express Mysore to Mumbai and back
Now another railway line connecting Harihar to Shimoga via Honnali is under construction by SWR.
Trains - There is a direct weekly train from New Delhi to Mysore (via Harihar). Train Name - SwarnaJayanthi Express is one of the longest connectivity so far from harihar. An interesting fact - Whether the train is coming from Mysore towards New Delhi or NewDelhi towards Mysore, surprisingly the time it passes Harihar both ways remains same around 1:30 AM.
Source :Wikipedia