Cam Atkinson made it 4-1 at 11:49 when he tipped in Owen Tippett's centering pass.
Konecny scored under the crossbar from the right face-off circle in transition to make it 4-2 at 12:35.
However, Trevor Zegras responded for the Ducks with a power-play goal at 2:42 of the third to make it 5-2, a play that started after Konecny gave the puck away trying to exit the zone.
Brett Leason banked a shot off Ersson's back to make it 6-2 at 3:14.
After Vatrano's third goal, Joel Farabee scored at 17:00 of the third for the 7-4 final.
"I thought we had a good start," Flyers coach John Tortorella said. "I thought their goalie made two or three good saves. We give them a free one when we fan on a pass, and they score on the power play and we're chasing. I thought we were coming [and then down], coming [and then down]. We were just really disjointed as far as sustaining our energy."
NOTES: Vatrano became the third player in Ducks history with an even-strength, power-play and short-handed goal in the same game (Corey Perry, Dec. 12, 2010; Paul Kariya, Jan. 10, 1997). He also joined Perry (nine goals, 2014-15) as the only Ducks players to score at least eight goals through the first eight games of a season. … Vatrano is the sixth player with multiple hat tricks in one season for Anaheim, joining Kariya (1996-97, 2000-02), Perry (2010-12, 2014-15), Teemu Selanne (1995-96, 1997-98), Ryan Getzlaf (2013-14) and Bobby Ryan (2010-11). … Strome has seven points (two goals, five assists) during a four-game point streak. ... Anaheim last won three straight games from Feb. 23-27, 2023. .... Konecny is the second player in Flyers history to score at least eight goals in the first eight games of a season, joining Simon Gagne (nine goals, 2005-06).