The 31-year-old fired three birdies on the front-nine as she made the turn at 13-under, still six better than second-placed Lydia Ko of New Zealand.
Another birdie for Ji at the 10th hole opened a seven-shot lead over Ko, who got one back with a birdie of her own at the 11th but never threatened the South Korean's title bid in the rest of the round.
Ji calmly tapped a three-foot par putt on the 18th to capture her third LPGA title and her first since her U.S. Women's Open triumph in July 2009.
"I'm so happy and excited because I haven't won for the past eight years," said Ji, who finished with a 17-under 271. "So I was waiting for this moment for so long, so I'm super happy right now."
"It is a nice day for playing golf today, and I have a really good group with Lydia and Jenny (Shin), so I was more relaxed with them and enjoyed playing with them."
Ko took the runner-up spot with a spotless seven-under 65 to finish with 11-under 277.
Ji became the 11th different South Korean to lift an LPGA title this season, joining Jang Ha-na, Amy Yang, Park In-bee, Lee Mi-rim, Ryu So-yeon, Kim Sei-young, Kim In-kyung, Park Sung-hyun, Lee Mi-hyang and Ko Jin-young.
(Reporting by Hardik Vyas in Bengaluru; Editing by Amlan Chakraborty)
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