Blake Wheeler and Mark Scheifele each had a goal and an assist, Dustin Byfuglien had two assists, and Connor Hellebuyck made 28 saves for the Jets.
"I don't think we're frustrated," Winnipeg forward Adam Lowry said. "I think for the most part we've played two pretty solid games. It comes down to a couple breaks. We miss a chance, they go down and tie the game 2-2 instead of it going to 3-1. We get a couple chances late there, they get a couple blocks and some big saves. I feel like we're right here."
Game 3 is Sunday at St. Louis.
"I would like every single goal I ever let in back," Hellebuyck said. "I'm going to prepare the same way and make sure my game's right, and we're gonna take it to them."
Sundqvist scored his first NHL playoff goal with a low wrist shot on an odd-man rush to give St. Louis a 1-0 lead at 5:23.