Is it possible to get from Tiberias to Ben Gurion airport by sheruts (share taxis)?
Do I need to change bus at some places? How much would it cost (approximately)?
There are sherut lines to Tiberias from Tel Aviv and Haifa:
NOTE: This is based on Ministry of Transportation information (Hebrew site), which might differ from actual practice.
Taking the train to Tel Aviv and switching to sherut will probably be the fastest and cheapest route.