"We've done a good job of staying responsible with the way we're playing, and when we do that, that's when we're successful," said captain Claude Giroux, whose team has allowed a total of nine goals in the five recent games against those league heavyweights.
St. Louis, which leads the Western Conference with 107 points, is coming off Saturday's 4-2 loss to visiting Dallas.
"Maybe they'll be a little ticked off . . . and it's going to be a tough game for us," Giroux said. "We'll have to make sure we play as a team, and if we do, I think we'll give ourselves a good chance to win."
The Blues are a quick, physical team that has an active forecheck.
"There's not much flash in their game; it's pretty simple: they get pucks in deep and they come at you hard," defenseman Luke Schenn said. "As soon as you look up, you think you have time, but the guy's right on you, so you don't have a lot of time and space to make plays against them."
In the win over the Blues, "we simplified our game, and tried to play a hard game, too - a north game and put pucks in deep," Schenn said. "It's a good challenge for us and the guys look forward to it."
Considering they started the season 1-7 and 4-10-1, it's pretty remarkable that he Flyers control their playoff destiny with eight games remaining.
"Getting off to the start we did, it looked like a long shot to be in this position, but you have to give the guys credit. There's a lot of character in this room," Schenn said. "There's a never-quit attitude here, for sure. The guys have worked hard to get in this position, and I don't think it's a fluke that we're here."
Is Flyers coach Craig Berube ready to include his team with the NHL's elite?
"We're getting close," Berube said. "I think we've shown we're getting to a pretty good level, but we have to continue to get better. I honestly believe we can get better than we're playing. . . . We can become a better defensive team."'