The presenter recently wrapped work on The Oprah Winfrey Show after 25 years, with 13.3m viewers tuning in to watch her reflect on her past in a special farewell episode.
King has now revealed that Winfrey plans to devote her time fully to the OWN cable network, but has first taken a "relaxing" trip to England.
"[Oprah's] on vacation right now," King told People. "She's taking a much-deserved, well-deserved break."
King quipped that she would also like to take a holiday, but is too busy working on her SiriusXM radio programme and her OWN chatshow.
Katie Couric, who has signed to host an upcoming series for ABC, said this week that no-one will ever be able to replace Winfrey as the premiere icon of daytime television.
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Watch clips from Oprah Winfrey's final show below: