Raffl was scheduled to become a restricted free agent July 1.
"The Flyers are a great organization and it's great place to play in," Raffl said in comments tweeted by the Flyers. "This is what I was hoping for."
Raffl, 27, has eight goals and 17 points in 61 games while averaging 14:17 minutes of ice time this season. In three seasons with the Flyers, he has 38 goals and 67 points in 196 games.
"The next three years should be the best years of my career, experience wise and maturity wise," Raffl said. "I'm looking forward to that."
The Flyers play the Calgary Flames at Wells Fargo Center on Monday (7 p.m. ET; SNW, CSN-PH, NHL.TV). Philadelphia is three points behind the Pittsburgh Penguins for the second wild card into the Stanley Cup Playoffs from the Eastern Conference
