Meghan Markleis making a last-minute trip to New York City so she can support her good friendSerena Williamsin the US Open final this weekend.

The Duchess of Sussex, 38, boarded a commercial flight from London on Friday morning, PEOPLE confirms. She is making the trip without husbandPrince Harryand 4-month-old sonArchie, who will remain home in Windsor.

Meghan is expected to return to Britain at the end of the weekend. “It is a last-minute trip,” a source toldThe Times, which broke the story of the royal’s plans. “Excited to support her friend, and then come back.”

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Meghan, Duchess of Sussex

Meghan, Duchess of Sussex, Archie Harrison Mountbatten-Windsor and Prince Harry, Duke of Sussex attend the King Power Royal Charity Polo Match, in which Prince William, Duke of Cambridge and Prince Harry, Duke of Sussex were competing for the Khun Vichai Srivaddhanaprabha Memorial Polo Trophy at Billingbear Polo Club on July 10, 2019 in Wokingham, England.

Meghan and Harry declined the invitation to spend time with the Queen, 93, and the royal family at Balmoral. A royal source says that the couple see Harry’s grandmother regularly as they live close to her at Windsor. They have also been busy planning their upcoming tour to Africa and preparing for theunveiling of Meghan’s capsule collectionshe has created with pal Misha Nonoo next week.

On Saturday, Meghan will be cheering on her close friend Williamsat the finalagainst Bianca Andreescu.

Kate Middleton and Meghan Markle at Wimbledon.Karwai Tang/Getty

LONDON, ENGLAND - JULY 13: Catherine, Duchess of Cambridge and Meghan, Duchess of Sussex in the Royal Box on Centre Court during day twelve of the Wimbledon Tennis Championships at All England Lawn Tennis and Croquet Club on July 13, 2019 in London, England.

In July, Meghan and some friendswatched Serena’s match at the Wimbledon championships. She then joined sister-in-lawKate Middletonfor thewomen’s final.

source: people.com