MosNews reports Estonian Prime Minister Andrus Ansip expressed his condolences as he announced all 12 passengers and the two pilots were killed.
Two U.S. citizens were passengers along with four Estonians and six fins.
The Sikorsky 76 helicopter belonged to Copterline airlines and crashed just three miles from the Estonian capital of Tallinn.
The helicopter was on one of its 14 daily flights between Tallinn and Helsinki, Finland -- an 18-minute trip -- when it went down for an as yet undetermined cause.
The Estonian rescue service said there was stormy weather in the area at the time.