Leo Carlsson had a goal and an assist for the Ducks (5-6-0), who lost all five in regulation during the skid. Lukas Dostal made 28 saves.
Matvei Michkov scored twice, and Porter Martone had a goal and an assist for the Flyers (3-7-3), who had won three straight games after losing their first nine (0-6-3) this season. Joseph Woll made 21 saves.
Michkov gave Philadelphia a 1-0 lead during a 5-on-3 power play at 13:59 of the first period with a shot through traffic from atop the face-off circles.
Martone's power-play goal made at 15:02 made it 2-0, a tap-in of Travis Sanheim's seam pass at the right post.
Carlsson cut it to 2-1 at 8:38 of the second period with a one-timer from the slot off a pass from behind the net by Cutter Gauthier.
It was Carlsson's first game against the Flyers since signing a five-year, $90 million offer sheet with them on July 3 that the Ducks matched six days later.
A.J. Greer tied it 2-2 at 13:07 after it was ruled his shot went off the far post and Woll's skate completely crossed the goal line.
Tyson Foerster put the Flyers ahead 3-2 at 15:04 with a shot along the ice from the right side that got under Dostal's pads.
Judd Caulfield tied it 3-3 at 16:19 on a redirection of Alex Killorn’s pass.
Luneau put the Ducks ahead 4-3 at 2:00 of the third period when his shot from the right side found room between Woll's arm and body.
Beckett Sennecke made it 5-3 with a power-play goal at 7:10, redirecting Carlsson's feed between Woll's pads.
Michkov's second goal at 8:17 made it 5-4. The forward jumped into the crease to knock a loose puck under Dostal.
