|Ordered||20 Jan 1941|
|Laid down||31 Oct 1941||Blohm & Voss, Hamburg (werk 615)|
|Launched||22 Jul 1942|
|Commissioned||10 Sep 1942||Oblt. Walter Wichmann|
|Successes||No ships sunk or damaged|
Sunk at 1051hrs on 28 August 1943 in the Kara Sea north-east of Mys Zhelaniya, in position 76.40N, 69.40E, by torpedoes from the Soviet submarine S-101. 47 dead (all hands lost).
U-639 operated with the following Wolfpacks during its career:
Eisbär (27 Mar 1943 - 15 Apr 1943)
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-639 did not suffer any casualties (we know of) until the time of her loss.