Iginla's goal at 5:07 of the second period put Calgary ahead 2-0 and gave the Flames' captain nine goals and four assists in his last seven games.
Jordan Leopold also scored for the Flames, who moved into sole possession of fifth place in the Western Conference, two points ahead of the Dallas Stars.
Steve Rucchin scored for the Mighty Ducks, who have just one win in their last nine road games.
Thrashers 4, Canucks 1
In Vancouver, British Columbia, Dany Heatley had a goal and an assist to help Atlanta beat Vancouver and end a 10-game winless skid.
Ronald Petrovicky, Marc Savard and Shawn McEachern also scored, while Pasi Nurminen made 30 saves for the Thrashers, who had given up 29 goals during six straight losses coming into the game.
Heatley, playing his eighth game since returning from injuries sustained during the Sept. 29 car crash that killed teammate and friend Dan Snyder, gave Atlanta a 2-0 lead 3:59 into the second period.
Daniel Sedin scored for the Canucks, who have dropped their first two games since the All-Star break to fall four points behind Colorado in the race for first in the Northwest Division.
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