It happened around 10:05 a.m. Monday on US Airways Flight 2051 parked in Terminal A.
The suspect is identified as 23-year-old Sasha Anderson from Philadelphia.
Police say Anderson threw her cell phone at the flight attendant. She also slapped and scratched his face.
The flight attendant suffered a minor scratch to his face.
Numerous passengers told police they were afraid to leave the ground with Anderson still on the plane.
Anderson was removed from the aircraft and charged with Simple Assault, Reckless Endangering another person, Harassment and Disorderly Conduct.