Bristol City's victory over Charlton means Lauren Smith's Robins have now earnt promotion to the Barclays Women's Super League.
City had the opening chance inside 2 minutes when Rachel Furness' header glanced just wide of the post.
The hosts then earned themselves a free kick five minutes later Shania Hayles was on the end of this one but her attempted volley was off target.
It was then time for the Addicks' first attack of the afternoon, Angela Addison and Freda Ayisi linked up well in the middle of the park, but Ayisi's eventual shot was blocked.
Melissa Johnson's pace was on show again this afternoon as she looked to take a strike inside the box but the Addicks' current top goal scorer was flagged for offside.
City then found their opener in the 25th-minute when Grace Clinton picked a loose ball from Kiera Skeels and slotted her shot past Rogers.
Addison continued to be a threat on the edge dancing her way into the box with some clever footwork but some resilient City defence saw her strike well defended.
Bristol extended their lead shortly after the break after Harrison's corner was swung in and put into the back of the net by Brooke Aspin.
Charlton had their best opportunity of the match in the 52nd minute when Ayisi threaded a ball through to Johnson her strike was heading goalwards beut Bentley came to the rescue for Lauren Smith's side and pushed it wide.
The Addicks continued to search for their opener as moments later Ayisi sent her strike towards Bentley's net but her shot was blocked, midfielder Mia Ross then gathered but their strike was wide of the mark.
The Robins made it three just before the 80th-minute mark after Aspin headed the corner ball home. Ffion Morgan then added her name to the scoresheet with a thunderous effort from range.
Charlton return to The Valley on Sunday, April 30th for a South London derby against Crystal Palace.
Charlton: Rogers, O'Rourke, N'Dow, Skeels, Henson, Ross, Simpkins (Basford 78) Follis (Hennessy 86) , Johnson, Addison (Roche 86), Ayisi (Logan 77)
Subs (not used) Gray, Soper, Bell
Booked: Rogers, O'Rourke, N'Dow
Bristol City: Bentley, Layzell, Aspin, Bruce, Bull (Powell 85), Syme, Furness, Hutton (Mustaki 68), Clinton (Palmer 75), Harrison, Hayles (Morgan 46)
Subs (not used) Bull, Clark, Pearse, Wooley,
Goals: Clinton (25), Aspin (46, 80), Morgan (88)