The incident unfolded at about 1 a.m. Tuesday as the car was heading north on 14th Avenue in South Seattle.
The driver lost control of the vehicle, veered into a fire hydrant and the car flipped over and slammed into a fence. As the driver and passenger fled from the scene, the car burst into flames.
Firefighters arrived and quickly doused the flames.
Police responded to the scene and quickly found the passenger, a woman who is five months pregnant. She was taken to the hospital as a precautionary measure.
After a search, officers found the male driver. He was arrested and booked into the King County Jail for investigation of felony hit and run.
The crash caused significant damage to the vehicle and the property at the crash scene, officials said.
A police spokesperson said alcohol may have been a factor in the crash.