The 18-year-old boybander was without his bandmates Niall Horan, Zayn Malik, Liam Payne and Louis Tomlinson and was returning from the States on a commercial flight on December 8, reported Ace showbiz.
Styles recently performed with his friends at Z100's annual Jingle Ball at Madison Square Garden on December 7. After the gig, he left the venue holding hands with Swift, 22, who also served as a musical guest at the star-studded festive event.
Despite the numerous sightings, the couple have not confirmed yet about their romance.
