The first set was almost half the match - an hour and 11 minutes - as the No.3-seeded Pavlyuchenkova rallied from 3-0 down and fought off four set points in her 5-6 service game to take a one set lead.
But the No.1-seeded Radwanska went right to work, winning the first three games of the second set and never really looking back, taking that set then - after staying on serve with Pavlyuchenkova through the first nine games of the third set - sneaking one last break out to close the match out, 67(6) 63 64.
"Especially after a great match, almost three hours of great tennis at a really high level, of course I'm very happy," Radwanska said. "It was a very close match - tight sets, all of them - but I was just a little bit better in the important moments today. And at the end of the third set I think I was playing a little bit more aggressively than she was, and I managed to win a couple more points than her in the end."
Radwanska was particularly fond of Seoul - an International event, but with a $500,000 prize purse.
"I really enjoyed my whole week here," Radwanska said. "Everything and everyone was great. It was nice to see the crowd getting bigger and bigger every day, and they really appreciated the tennis.
"I didn't see much of the city while I was here though," she added. "I arrived a little bit late and I was playing almost every day, and tonight I have a flight to Tokyo. But I think this is the reason I have to come back here again and see something other than the courts! I hope to be back next year."
Radwanska's previous two WTA titles this year came in the first two weeks of the year, in Auckland and Sydney. She is the fourth player to capture three or more WTA titles so far this season, after Serena Williams (who has nine WTA titles this year), Simona Halep (four) and Victoria Azarenka (three).
Pavlyuchenkova may not have come away with the title, but she found the positives in the result.
"It's tough losing this match after fighting so long and coming so close," Pavlyuchenkova said. "It's difficult and frustrating, but in tennis you can be up then down and you lose some and you win some.
"I'm actually proud of myself. I had a great week. I showed some good tennis and it was a great final. And I was pretty tired - not only after a few tough matches, but even coming into the tournament after being in the States and the jet lag. So I'm proud to be in the final and come so close to the title."
The doubles final followed and this time the underdog won, as Chan Chin-Wei and Xu Yi-Fan followed upsets earlier in the week over the No.2 and No.3 seeds with a 75 63 win over No.1 seeds Raquel Kops-Jones and Abigail Spears for the title. Chan and Xu both took away their very first WTA-level title.