The win gave the Flyers a .500 record for the first time this season, at 11-11-1. Philadelphia has won five of its last seven games.
Marc Methot scored for the Senators, who lost in regulation for the first time since Feb. 16.
Goalie Ben Bishop had won his last four starts for Ottawa, posting 1.69 goals-against average during the stretch. But the Senators have had trouble scoring on the road and struggled to get quality chances against the Flyers.
They said, 'You're going to love the city. It's smaller than Philadelphia, but you're going to love it. You're going to love the fans. Just watching the playoffs last year, the fans seemed louder there than they did anywhere. I'm really excited about that.
— Forward Scott Hartnell on his upcoming season with the Columbus Blue Jackets