Instead of spending some quality time with her family in the US, the 22-year-old actress took a break to reconnect with Pattinson's family. The couple are trying to get back together after Stewart's fling with married director Rupert Sanders became public, reported Daily Mail online.
They were spotted standing in line at Heathrow airport for a flight back to New York.
Stewart sported black rimmed glasses and her brown hair was pulled into a high ponytail as she carried a shoulder bag through the terminal.
Like her boyfriend, she wore jeans and trainers and completed her casual look with a grey wool cardigan under a black blazer.
Pattinson kept his sunglasses firmly on, even after the couple stepped out in the dark evening to their waiting vehicle.
An excited fan who was on the same flight to JFK posted a picture of the couple getting out of a cap, and entering the airport. "Look who is on my plane! Robert Pattinson and Kristen Stewart."
They were not the only celebrities boarding the plane to the Big Apple though as the eyewitness continued writing, "I can't believe that! So excited! New York City here I come with Pattinson and Stewart and Paul McCartney."