The Avalanche trailed 2-1 entering the third but came out strong at the start of the period. They put nine quick shots on goalie Al Montoya before Hejda tied it with 12:47 left on an assist by Stastny.
Stastny netted the winner with 5:28 left to give Colorado its fourth straight victory.
Montoya stopped 33 shots before being pulled for an extra skater with 1:30 left.
When we started our journey we made a commitment to our fans to be relevant and to see the Chicago Blackhawks become the best professional hockey organization. There are not two finer symbols of that than Jonathan Toews and Patrick Kane. The commitment we have made to these incredible young men is equal to the commitment they have made to our team, our fans, our entire organization and the city of Chicago.
— Chicago Blackhawks owner Rocky Wirtz on signing Jonathan Toews and Patrick Kane to contract extensions