All 20 people on board were killed, police said Sunday, Aug. 5, 2018.
The Ju-52 aircraft, made by Germany's Junkers, were made between 1932 and 1952.
The vintage aircraft crashed into the Piz Segnas mountain in the Flims resort on Saturday.
Police have confirmed the crash, saying in a tweet that it occurred on the western side of the mountain Piz Segna (top picture) at about 2,540 meters (8,333 feet) above sea level on Saturday.
Among those killed were 17 people from Switzerland and a three-person family from Austria.
Twenty people are feared dead after a sightseeing plane crashed in the Alps in Switzerland.
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The German-built Junker JU52 HB-HOT aircraft, dating from 1939 and nickamed "Iron Annie", was a collectors' aircraft.
The plane appears to have hit the ground near-vertically and at "relatively high speed", according to Daniel Knecht of the Swiss Transportation Safety Investigation Board.
Andreas Tobler, Grisons canton chief of police said there was "no longer any hope of finding anyone alive".
The plane was flying the passengers back from a two-day trip to Locarno in southern Switzerland to its base at Duebendorf, near Zurich. It has suspended all flights until further notice.
In another Swiss plane crash yesterday, a tourist plane carrying a couple and two young children crashed in a forest in the Nidwald canton and immediately burst into flames.