This semi-final was billed as attack versus defence and it was the solid, reliable manner of Kerber that prevailed as she let an erratic Ostapenko, who was going for winners on nearly every shot, hand her a swathe of free points.
For the second time in three years, Williams will face Angelique Kerber for the title.
But the former world number one has been reinvigorated over the last few months.
"I didn't expect to play this well so quickly into my comeback", Williams said after the match.
Two months ago she withdrew from her French Open last 16 match against Russia's Maria Sharapova due to health problems just hours before the encounter was planned to start.
Showing her first sign of nerves Kerber wasted a match point and was broken when she served at 5-1.
That mentality shifted slightly when Williams dropped her first set of the championships in the quarter-finals against Camila Giorgi and following the stunning exit of overwhelming men's favourite Roger Federer yesterday, which proved the unthinkable can happen. She won the grass-court tournament the last two times she played it, in 2015 and 2016, before missing it past year while pregnant.
She is on a 19-match winning streak at the All England Club, with her last defeat coming against France's Alize Cornet in the 2014 third round.
That all changed once Serena clinched the first break, Goerges wobbled and wilted under the intense attacks from the 36-year-old.
Goerges is the only one of the four semi-finalists still waiting to win her first Grand Slam title.
She was, instead, going to employ spectacular defense and solid, steady play, while letting her opponent, Jelena Ostapenko, be the one to determine the outcomes of almost every point.