The victim was walking countrywards on the Sydenham Bypass between 22:00 and 23:00 GMT on Saturday night when she was forced into the man's dark-coloured car and attacked.
The woman then escaped.
The car was reported to have travelled along the road in the direction of Holywood following the attack.
The man was said to be in his 30s and was wearing a dark top with the hood up.
A woman has been raped after a man pulled her into his car in east Belfast.