Wheeler extended the lead to 3-0 on a breakaway at 18:46, shortly after Flames forward Matthew Tkachuk chipped a shot into the air and off the top of the crossbar.
"It makes it a lot tougher when you get down, and then you get down a couple and you're chasing the game," Giordano said. "You try to take chances, and if you do have a turnover or a missed play, it ends up coming back at you. The guys didn't lose belief or anything like that. They came out and got that early goal, and then you're chasing it for the rest of the night."
Wheeler scored on the power play 3:02 into the third period for the 4-0 final. It was his 800th NHL point in his 977th game (277 goals, 523 assists).
"This night belongs to our team and the fact we're going back to the playoffs," Wheeler said. "That's all I play for, especially this part of my career, is just having the opportunity to achieve the ultimate goal. That's what makes this night special."
NOTES: Jets center Mark Scheifele scored his 500th NHL point, in his 571st game, with an assist on Wheeler's second goal (199 goals, 301 assists). ... Wheeler has scored six points (three goals, three assists) during a five-game point streak. ... It was coach Paul Maurice's 300th win with Winnipeg (300-211-57). … Calgary is 1-21-1 when trailing entering the third period. ... Flames forward Johnny Gaudreau had his seven-game point streak end (three goals, five assists).