Conor Sheary (11th goal of the season) opened the scoring in the first period but Sean Couturier (13th) got it right back. A Tom Wilson power play goal (11th), a Nicklas Backstrom power play goal (14th) and a Carl Hagelin tally (4th) put the Caps ahead 4-1 at the end of the stanza.
In the second period, debuting Caps forward Anthony Mantha (12th of the season) picked up his first goal and second point for his new team. Alexander Ovechkin (22nd) added to the carnage in the third period.
Brian Elliott went the distance despite the lopsided score. He stopped 26 of 32 shots. Ilya Samsonov earned the win with 29 saves on 30 shots.
TURNING POINT
The Flyers were outplayed all night by a wide margin. But a needless penalty on Nicolas Aube-Kubel and a subsequent power play goal by Bäckström was the point where things went from a rough start to a brewing blowout.
MELTZER'S TAKE
1) The Flyers yielded all sorts of time and space to Washington in a lopsided and ugly first period. They also couldn't get saves from Elliott moving across. Shots were 18-8 Caps and 4-1 in the cash register.
Sean Couturier rang an early shot off Samsonov's mask. At the other end, a puck that deflected off Oskar Lindblom created a tough save for Elliott. At 7:07, Elliott lost his positioning and Sheary put the puck in the open side of the net. A failed clear preceded the goal sequence.
2) Scott Laughton was denied by Samsonov's pad but the Flyers scored very shortly thereafter. A James van Riemsdyk shot was deflected home by Couturier at 8:45. That was pretty much the lone Flyers highlight.