Leighton has appeared in only one game this season, giving up five goals on 26 shots in a loss to Tampa Bay.
Boucher is in his third stint with the Flyers, having led the team to the 2000 Eastern Conference Finals as a rookie and shared goaltending duties with Leighton on their run to the 2010 Stanley Cup Final.
It's not always going to be pretty, especially against a great goalie [Lundqvist] like that. My goals are never how you draw them up. It's just a matter of grinding it out and trying to create havoc in front and good things happen.
— Capitals forward Jay Beagle on scoring in their Game 3 victory against the Rangers on Monday