Kane scored on a rebound off a shot by Viktor Stalberg with 6:18 left to put the Blackhawks up 6-4 after they nearly let a 5-1 lead slip away.
Toews then added his second power-play goal of the night about two minutes later to give Chicago a three-goal cushion on its way to a third straight win.
David Backes scored for St. Louis with 2:39 left, but the Blues lost their third consecutive game.
In Toronto, Simon Gagne made an impressive return to the Lightning lineup, scoring 1:15 into overtime to lift Tampa Bay over Toronto.
The star forward also provided a screen when Martin St.
Louis tied the game with just 8.7 seconds left in regulation.
It was quite a night for Gagne, who had missed 18 games with a neck injury. The overtime winner came on a 2-on-1 rush with Brett Clark and was Gagne’s first goal as a member of the Lightning.
St. Louis had two goals and Ryan Malone also scored for Tampa Bay.
Nikolai Kulemin scored twice and Kris Versteeg had the other goal for Toronto.
At Nashville, Tennessee, Shea Weber and Cal O’Reilly each scored a power-play goal and Pekka Rinne made 33 saves as Nashville topped Phoenix.
Jordin Tootoo also scored into an empty net for the Predators, who snapped a four-game losing streak. It was Rinne’s 17th career shutout and third of the season.
The Coyotes have lost two straight following a seven-game winning streak.
In San Jose, California, Henrik Zetterberg batted a puck out of the air from the slot to score one of his two goals as Detroit beat San Jose.
Zetterberg added two assists on a night when the ice was far from its best because of a long power outage at HP Pavilion that forced both teams to cancel their morning skates.
Pavel Datsyuk, Danny Cleary and Patrick Eaves also scored for the Red Wings. Jimmy Howard made 25 saves to win for the 27th time in his last 33 regular-season starts.
Dany Heatley, Benn Ferriero and Ryane Clowe scored for the Sharks.
In Denver, Anthony Stewart scored 1:49 into overtime as Atlanta beat Colorado to match a franchise record with its sixth straight victory.
Dustin Byfuglien and Rich Peverley added goals for the Thrashers, who also won six in a row in March 2009.
Ondrej Pavelec made 29 saves. By winning all six games during the current streak, Pavelec broke the team record for consecutive wins by a goalie. He has stopped 230 of 238 shots in the past six games.
David Jones and Matt Duchene had third-period goals for Colorado.
