In the set, Williams won an incredible 87 percent of her first-serve points (13 of 15).
Williams will next face German world No 10 Angelique Kerber on Saturday in a repeat of the 2016 showpiece won by Williams.
Williams has barely played in the last 18 months having taken a year off to start a family.
Williams dominated much of her semifinal Thursday, beating 13th-seeded Julia Goerges of Germany 6-2, 6-4 at Centre Court to close in on what would be an eighth championship at the All England Club and 24th major trophy overall. "We played here in the final the last time I played here in the final".
In Saturday's final, Williams, 36, will compete against another German player, No. 11 seed Angelique Kerber, herself a two-time Grand Slam champion.
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Two months away from turning 37, and just 10 months after giving birth to her first child, this extraordinary athlete now has the opportunity to relive the 2016 Wimbledon final, when she played and defeated Kerber.
"I don't want to limit myself", Williams said. She's coming back and for me also I'm coming back from 2017.
In September 2017, she gave birth to her daughter Alexis Olympia, an experience which she later described as life-threatening and detailed complications she faced from a pulmonary embolism and a host of surgeries to prevent blood clots spreading to her lungs.
At the beginning of the match, it seemed as if it may just work with the crowd-pleasing Ostapenko mixing her big boisterous hitting with some drop shots, as if to signal that she has soft hands as well.
In each set Goerges was broken in the sixth game and she simply did not have the firepower or belief to stop the seven-times champion from surging to a 20th successive win on the hallowed turf.
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"It's about picking yourself up off the floor", said Jill Smoller, Williams's close friend, confidante and agent of almost 20 years.
"There's word on the street", Williams said when asked if Meghan would attend the final.
Serena Williams is into the Wimbledon final.
Extended bed rest followed. So I remember I couldn't even walk to my mailbox, so it's definitely not normal for me to be in a Wimbledon final.
But she declined to compare her recovery to other injuries and setbacks she has experienced, pointing to the joy of motherhood that offsets it all. "In a way, it's by far the toughest, but in a way it's by far the best". When she returned from maternity leave at Indian Wells in March, every baby step was celebrated.
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The center-back will be key to limiting England's threat from set pieces and will be a useful weapon in the opposition box, too. The more big games we're involved and the more they come out successful in, the more belief it will build.
History was made at Wimbledon this year when all the top-10 seeds were knocked out before the quarterfinals for the first time.