After a poor start from both players, Serena Williams steadied herself to take the first set and found something approaching her best form to dominate the second.
The victory moves her to joint-fourth in the all-time list of major winners, alongside Martina Navratilova and Chris Evert.
Serena Williams, 32, has now won three successive titles at the US Open, the scene of her first Grand Slam triumph 15 years ago.
“It was a really wonderful feeling,” said Serena Williams, who was joined by Navratilova and Evert for the trophy presentation, when she also collected $4 million in prize money.
“I couldn’t have finished things in a better way. It is a pleasure for me to win here, I am really emotional. I couldn’t ask to do it at a better place.”
Caroline Wozniacki, a close friend of Serena Williams, said: “Congratulations to Serena. She really deserved it today and played better than me.
“She is an inspiration to me on and off the court and an unbelievable friend – and you definitely owe drinks later!”
Serena Williams arrived in New York having failed to make it past the fourth round of a Grand Slam in 2014, but the American looked a class apart throughout the two weeks at Flushing Meadows.
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