The goal came on a slap shot from the blue line with Reto Berra screened by a group of players in front.
Mike Smith had 29 saves for the victory.
Lance Bouma, with his fourth goal of the preseason, and Corban Knight scored for Calgary. The Flames have a full week off before opening the regular season in Washington on Oct. 3.
Calgary trailed 2-0 until halfway through the third period when the Flames beat Smith, tying the game with goals less than two minutes apart from Bouma and Knight.
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