• Prince Harry and Meghan Markle left before the Platinum Jubilee finale because they had already done their duty, a royal expert says
  • Neil Sean suggested that the pair didn't attend more Jubilee events because they couldn't sit in the royal box
  • The Sussexes skipped the "Party at the Palace" concert and the pageant after attending the Jubilee service

Prince Harry and Meghan Markle flew back home to California with their children before the festivities for Queen Elizabeth's Platinum Jubilee ended Sunday.

The Duke and Duchess of Sussex flew out of Farnborough Airport in England on a private jet at 1:30 p.m. Sunday with their son, Archie, 3, and their daughter, Lilibet, 1, missing the Platinum Jubilee Pageant that closed out the Jubilee's four-day festivities, Page Six reported.

Royal expert Neil Sean weighed in on the couple's decision to quietly depart before the celebrations wrapped up and suggested that Prince Harry and Markle had no interest in appearing in the remaining Jubilee events.

"I kind of think the bottom line was this — Harry and Meghan ... they'd done their duty. They weren't really wanting to go to anything else. There was nothing else left for them to ... participate in," Sean, who has served as a royal correspondent for various media outlets, said in a video on his YouTube channel.

"They could have attended the 'Party in the Palace' [concert] and the brilliant Pageant," he continued. "But they couldn't really sit in the royal box, which just seemed in some cases, I think, a little bit of curt. But of course, that is royal protocol, so they decided, 'Well, no more for us then, might as well return home.'"

Prince Harry and Markle attended the Trooping the Colour parade Thursday but watched from the Major General’s Office instead of the Buckingham Palace balcony. It was previously announced that Queen Elizabeth decided that only senior working members of the royal family would stand on the balcony with her this year.

The Duke and Duchess of Sussex made their first and only official appearance at the Jubilee Friday while attending a Service of Thanksgiving at St. Paul's Cathedral.

Prince Harry and the former "Suits" star were greeted with a mix of cheers and boos from the crowd that had gathered outside the church, according to reports.

The couple was not spotted publicly interacting with Prince Harry's father Prince Charles, his older brother Prince Willaim and his sister-in-law Kate Middleton during their U.K. trip.

But before they returned home, Prince Harry and Markle extended an olive branch to Prince William and Middleton by inviting them and their three children — Prince George, 8, and Princess Charlotte, 7, and Prince Louis, 4 — to their daughter Lilibet's first birthday party at their U.K. home, Frogmore Cottage, in Windsor Saturday, Page Six reported, citing unnamed sources.

However, the Cambridges did not attend because they were set to visit Cardiff Castle in Wales as part of the Jubilee celebrations, according to the outlet.

"Things are still fraught — William is still wary of spending any time alone with Harry as you never quite know what may be reported back afterward," one U.K.-based insider claimed.

Harry and Meghan made their first public appearance in Britain for two years
Harry and Meghan made their first public appearance in Britain for two years POOL via AFP / TOBY MELVILLE