On February 9, 1995, a Montreal team desperate to salvage a difficult season traded LeClair, along with ric Desjardins and Gilbert Dionne to the Philadelphia Flyers in exchange for Mark Recchi and Philadelphia's 3rd round choice (Martin Hohenberger) in the 1995 NHL Entry Draft. LeClair gelled immediately with new line-mate Eric Lindros and quickly became one of the NHL's most feared goal scorers.
With the Flyers he played left-wing on the famed "Legion of Doom" line, centered by Lindros and Mikael Renberg on right-wing. The trio was not only effective at scoring but they were also a dominant physical presence on the ice. In 1998, LeClair became the first American-born NHL player to record three consecutive 50-goal seasons and the second Flyer to do so, behind Tim Kerr.