We can't compare one state with other states .KA is South India's largest state while WB is little more than 1/3 of KA's sq Km's. In Aviation area Matters. In India Airports have to be apart from Eachother at a certain Distance Currently its 150kms apart from first airport.
There are around 8 passenger airports in Ka. Latest one being Bidar. Shimoga will be 9th bit delayed one for a city which gave KA's Most CM's. Shimoga/Shivamogga/Sihimoge is know as Capital of Malnad(Ma Le Nadu meaning Land of Rains. One of the highest Rainfall Receiving Regions of india).
Upcoming...
more... airports Chikkamagalur,Hassan(both parts of Malenadu),Bellary,Karwar,Bijapur and a third planned International Airport most probably at Hubli.