The Flyers' remarkable turnaround from the worst team in the NHL last season to the Eastern Conference playoffs was completed when Florida beat Carolina 4-3 shortly after Philadelphia's win.
R.J. Umberger scored his 13th goal of the season only 5:44 into the game, and Scottie Upshall and Joffrey Lupul scored 37 seconds apart in the third.
BRUINS 2, SENATORS 1
At Ottawa, Tim Thomas came within 8:14 of recording his third straight shutout against Ottawa and Zdeno Chara scored against his former team, leading Boston to a 2-1 win over Ottawa as both teams clinched playoff berths.
Phil Kessel also scored for Boston, which also drew even with Ottawa for sixth overall in the Eastern Conference with 94 points.
The Senators completed their regular season schedule, clinching a playoff spot midway through the third period when Florida beat Carolina 4-3.
ISLANDERS 4, RANGERS 3
At New York, Richard Park scored a short-handed goal in the second period and then added the decisive tally in the shootout for the New York Islanders, who finished a disappointing season with a 4-3 victory over the New York Rangers.
Jaromir Jagr got the Rangers even at 3 just 4:20 into the third period, but it wasn't enough.
PANTHERS 4, HURRICANES 3
At Raleigh, N.C., Nathan Horton had a goal and an assist and Florida beat Carolina 4-3 to prevent the Hurricanes from clinching the Southeast Division.
Radek Dvorak added a goal and an assist, and Jay Bouwmeester and Steve Montador also scored for the Panthers, who snapped a 13-game losing streak on Carolina's home ice.